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• Routing and authenticating all access through squid

  - by Knight Samar

  Hi, I want to route all Internet access in my network through a Squid proxy server and authenticate and log all users. I want this to be a client-independent setting so that no one needs to do anything on their browsers or machines. I have set my network gateway as the proxy server so that all traffic will be sent to it. I have done this using options in DHCP server. Now I tried using squid as a transparent proxy, but then it won't authenticate in that mode. I tried using iptables to route all traffic to port 3128 but it won't popup the authentication dialog box from SQUID. I tried telling DHCP to give WPAD to all clients by placing a WPAD file on a webserver containing the following for automatic proxy configuration on clients: Changes in dhcpd.conf option wpad code 252 =test; option wpad "\n\000"; option wpad "http://192.168.1.5/wpad.dat\n"; The WPAD file: function FindProxyForURL(url,host) { return "PROXY squid-server-ip-address:3128 ; DIRECT "; } But the browsers (different versions of Firefox and IE) seem to ignore it. :( What should I do ?

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• Reliable router with good VPN and WAN Throughput [closed]

  - by Asdande

  I have 2 cisco rv180 VPN router. These routers are giving me lots of problems. The webpages wont load correctly, slow response to load webpages plus other many issues. I have several cases pending with cisco. I give up on these routers. I would like to know if you guys can recommend me a reliable router for our 3 branches (NY - main, SC and FL). In NY- main office, we have 55 users. In SC branch, 6 users. In Florida we only have 1 (will grow soon). I need a router capable of support: 3 VPNs Site-to-Site connection VPN throughput of at least 40-50 Mbps WAN throughput at least 100 Mpbs and up PPTP Server for at least 5 PPTP users Web filtering - all users need access to internet Good Firewall Port forwarding for FTP Server - able to show the public IPs of FTP users (rv180 cannot do that, just shows me router's LAN interface IP, opened a case with cisco, now escaleted to level 2, still no answer or workaround) Dual WAN ports for balance or backup internet. Gigabit WAN/LAN ports Price between $400-$500 range. I was thinking on the TP-LINK TL-ER6120 or TL-ER6020 according to the review on smallnetbuilder.com http://www.smallnetbuilder.com/lanwan/lanwan-reviews/31983-tp-link-tl-er6020-safestream-gigabit-dual-wan-vpn-router-reviewed but I don't want to make another mistake as I did when I bought the cisco RV180. Thank you in advance,

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• SFTP, SCP, Secure Webdav: which is the most suitable ?

  - by Xavier Maillard

  Hi, currently, I am hosting a webdav share setup in order to store files I need anywhere I am. It is available via HTTPS. Things are that I do not need all the HTTP machinery -i.e. my nginx http server is only there for this webdav folder. I am not sure I made the best choice. My requirements on the client side are: secured transfers mountable as a network drive at work with 'near realtime sync' usable for any OS I could use (including my mobile (android)) At first, I chose webdav since it would pass through my work proxy (which refuses all that is not on HTTP/S (port 80 or 443)). Today, I am not satisfied with the setup and even if nginx memory footprint is pretty small, its webdav support is not really "clean" and full. What would you recommend between SFTP, SCP and the current webdav solution ? I think SFTP is the closest solution but I still have to find out how to pass through my proxy ;) SCP seems quite limited as I read about it (only file transfers if I read right). Cheers

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• Server not accepting uploads

  - by Tatu Ulmanen

  I'm having a strange problem with my VPS: I can download files from it, I can use PuTTy to connect to it and all behaves normally. But sometimes, when I try to upload a file to the server or save a file via SFTP, the connection inexplicably fails. I am using jEdit to edit files remotely via SFTP. When it works, it works fine. When it doesn't, I get an error message: Cannot save: java.io.IOException: inputstream is closed Cannot save: java.io.IOException: 4: I can see that a temporary save file (#file.php#save#) is created on the server with a filesize of 0. So the connection works, but when it comes to sending the actual data, something fails. The same thing with WinSCP, but the error is different: Copying file fatally failed. Copying files to remote side failed. And I can always browse the server with PuTTy without a problem. I see nothing abnormal in any log files. Auth.log shows this when I try to save: sshd[32638]: Accepted password for - from - port 62272 ssh2 sshd[32638]: pam_unix(sshd:session): session opened for user - by (uid=0) sshd[32640]: subsystem request for sftp sshd[32638]: pam_unix(sshd:session): session closed for user - When I wait for a while (say, an hour), everything works fine again. It can't be a temporary ban, as I am still allowed to connect to the server, right? I know this may not be enough info to solve the problem, but I am grateful for any clues or bits of information that might help me. What are the possible causes for this kind of behaviour, what log files can I check for clues etc.. I'm running out of ideas!

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• Password-less login into localhost

  - by Brad

  I am trying to setup password-less login into my localhost because it's required for a tutorial. I went through the normal steps of generating an rsa key and appending the public key to authorized_keys but I am still prompted for a password. I've also enabled RSAAuthentication and PubKeyAuthentication in /etc/ssh_config. Following other suggestions I've seen, I tried: chmod go-w ~/ chmod 700 ~/.ssh chmod 600 ~/.ssh/authorized_keys But the problem persists. Here is the output from ssh -v localhost: (tutorial)bnels21-2:tutorial bnels21$ ssh -v localhost OpenSSH_5.9p1, OpenSSL 0.9.8r 8 Feb 2011 debug1: Reading configuration data /etc/ssh_config debug1: /etc/ssh_config line 20: Applying options for * debug1: Connecting to localhost [::1] port 22. debug1: Connection established. debug1: identity file /Users/bnels21/.ssh/id_rsa type 1 debug1: identity file /Users/bnels21/.ssh/id_rsa-cert type -1 debug1: identity file /Users/bnels21/.ssh/id_dsa type -1 debug1: identity file /Users/bnels21/.ssh/id_dsa-cert type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9 debug1: match: OpenSSH_5.9 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.9 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Server host key: RSA 1c:31:0e:56:93:45:dc:f0:77:6c:bd:90:27:3b:c6:43 debug1: Host 'localhost' is known and matches the RSA host key. debug1: Found key in /Users/bnels21/.ssh/known_hosts:11 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,keyboard-interactive debug1: Next authentication method: publickey debug1: Offering RSA public key: /Users/bnels21/.ssh/id_rsa debug1: Authentications that can continue: publickey,keyboard-interactive debug1: Offering RSA public key: id_rsa3 debug1: Authentications that can continue: publickey,keyboard-interactive debug1: Trying private key: /Users/bnels21/.ssh/id_dsa debug1: Next authentication method: keyboard-interactive Password: Any suggestions? I'm running OSX 10.8.

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• How can I create a VLAN on my extreme switch for a seperate subnet/domain?

  - by drpcken

  I'm putting together a small active directory implementation for a buddy of mine. I currently have 2 servers (one is the primary domain controller) and a couple clients. I need to test and run updates on every machine on this domain, but I would have plug them into my current LIVE domain to get it internet access. From what I've read having two separate domains on a single subnet is a bad idea (even though it is temporary) so I don't want to risk messing anything up on my production domain. I'm pretty sure I can create a separate VLAN on my extreme 48 port switch and plug this smaller domain into it on a different subnet, but I don't know the commands. Both subnets would need internet access of course (one of the things I can't wrap my head around is routing internet traffic between subnets (gateway is on production subnet). My production domain is on subnet 192.168.200.0. My new domain I want to put online would go into subnet 192.168.10.0. A shove in the right direction would be greatly appreciated. Thank you!

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• Family server setup

  - by Manny

  Hi all, I really hope some of you can give me some direction. I have setup a linux server at home and through samba I can access files from different computers in my home. I would like to use this server as a file-server for my family (brothers, sisters and parents who all live in their own homes). I really like the way it is set up right now with user and permission controls, but I've read that it is bad idea to open up the samba port to the world. The requirements are simple: 1) it should be easy to access, by using standard web browsers or mounting the drive (shouldn't have to use any VPN setup or use putty etc) 2) should be somewhat secure. We just want to share family pictures instead of putting them on facebook or picasa or other web server, nothing top secret. Here is what I've looked into: 1)Webdav. It seems decent but seems like it windows7 doesn't like it very much, even with digest mode authentication. User controls and permissions are not as flexible as samba (or at least to my knowledge). I really like the user and group permissions in samba, but if I could live with webdav if it worked seamlessly with windows, it should just work shouldn't it? 2) I read somewhere to stay away from ftp as it is outdated and that there are newer and better internet file-server setups? Was that a reference to webdav? I am so confused, please help... Manny

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• SNMP closed state in CentOS

  - by anksoWX

  I'm having a problem here, I've added to my IPtables rules this: -A INPUT -p tcp -m state --state NEW -m tcp --dport 161 -j ACCEPT -A INPUT -p udp -m state --state NEW -m udp --dport 161 -j ACCEPT but when I scan with nmap or any other tool it says this: Not shown: 998 filtered ports PORT STATE SERVICE 22/tcp open ssh 161/tcp closed snmp also when I am doing: netstat -apn | grep snmpd tcp 0 0 127.0.0.1:199 0.0.0.0:* LISTEN 3669/snmpd<br> udp 0 0 0.0.0.0:161 0.0.0.0:* 3669/snmpd<br> unix 2 [ ] DGRAM 226186 3669/snmpd Also: service iptables status Table: filter Chain INPUT (policy ACCEPT) num target prot opt source destination 1 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED 2 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 3 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 4 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:161 5 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:161 6 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22 7 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited Chain FORWARD (policy ACCEPT) num target prot opt source destination 1 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited Chain OUTPUT (policy ACCEPT) num target prot opt source destination Any idea what's going on? There is no UDP in closed/open state. what do I have to do?

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• ssh - "Connection closed by xxx.xxx.xxx.xxx" - using password

  - by Michael B

  I attempted to create an new user account that I wish to use to log in using ssh. I did this (in CentOs): /usr/sbin/adduser -d /home/testaccount -s /bin/bash user passwd testaccount This is the error I receive when trying to log in via ssh: ~/.ssh$ ssh -v [email protected] OpenSSH_5.1p1 Debian-5ubuntu1, OpenSSL 0.9.8g 19 Oct 2007 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug1: Connecting to xxx.xxx.xxx [xxx.xxx.xxx.xxx] port 22. debug1: Connection established. debug1: identity file /home/user/.ssh/identity type -1 debug1: identity file /home/user/.ssh/id_rsa type 1 debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048 debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048 debug1: identity file /home/user/.ssh/id_dsa type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_4.3 debug1: match: OpenSSH_4.3 pat OpenSSH_4* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.1p1 Debian-5ubuntu1 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-cbc hmac-md5 none debug1: kex: client->server aes128-cbc hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Host 'xxx.xxx.xxx.xxx' is known and matches the RSA host key. debug1: Found key in /home/user/.ssh/known_hosts:8 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Next authentication method: gssapi-with-mic debug1: Unspecified GSS failure. Minor code may provide more information No credentials cache found debug1: Unspecified GSS failure. Minor code may provide more information No credentials cache found debug1: Unspecified GSS failure. Minor code may provide more information debug1: Next authentication method: publickey debug1: Offering public key: /home/user/.ssh/id_rsa debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Trying private key: /home/user/.ssh/identity debug1: Trying private key: /home/user/.ssh/id_dsa debug1: Next authentication method: password testaccount@xxx's password: Connection closed by xxx.xxx.xxx.xxx The "connection closed" message appeared immediately after entering the password (if I enter the wrong password it waits and then prompts for another password) I am able to log in from the same computer using other accounts that had been setup previously. When logged into the remote machine I am able to do 'su testaccount' Thanks for your time.

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• IPTables forward from only one ip on my server

  - by user1307079

  I was able to get my server to forward connections on a certain port to a different IP, but when I add -d to specify an IP to froward from, It does not work. This is what I am trying, iptables -t nat -A PREROUTING -d 173.208.230.107 -p tcp --dport 80 iptables -t nat -nvL-j DNAT --to-destination 38.105.20.226:80. It works fine without the -d. Here is my ifconfig dump: em1 Link encap:Ethernet HWaddr 00:A0:D1:ED:D0:54 inet addr:173.208.230.106 Bcast:173.208.230.111 Mask:255.255.255.248 inet6 addr: fe80::2a0:d1ff:feed:d054/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:100058 errors:0 dropped:0 overruns:0 frame:0 TX packets:18941701 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:12779711 (12.1 MiB) TX bytes:825498499 (787.2 MiB) Memory:fbde0000-fbe00000 em1:9 Link encap:Ethernet HWaddr 00:A0:D1:ED:D0:54 inet addr:173.208.230.107 Bcast:173.208.230.111 Mask:255.255.255.248 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Memory:fbde0000-fbe00000 em1:10 Link encap:Ethernet HWaddr 00:A0:D1:ED:D0:54 inet addr:173.208.230.108 Bcast:173.208.230.111 Mask:255.255.255.248 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Memory:fbde0000-fbe00000 em1:11 Link encap:Ethernet HWaddr 00:A0:D1:ED:D0:54 inet addr:173.208.230.109 Bcast:173.208.230.111 Mask:255.255.255.248 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Memory:fbde0000-fbe00000 em1:12 Link encap:Ethernet HWaddr 00:A0:D1:ED:D0:54 inet addr:173.208.230.110 Bcast:173.208.230.111 Mask:255.255.255.248 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Memory:fbde0000-fbe00000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

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• A very peculiar problem with an old pc and a newer laptop...

  - by user553492

  I got my old pc ( 248mb ram , 80 GB ) repaired and the tech people put XP in it .My newer laptop has UBUNTU 10.04 .now I only have one cable and one usb cord .So I connected my modem (with only one CAT5 port and 4 usb ports ) to laptop with CAT5 cable .Th internet is working fine . I also wanted to use net on older pc so I installed the usb drivers for win and it worked. But I got fed up of win xp and made a separate partition for FreeBSD which I planned to install .During the install I screwd up sumthing and now freebsd starts with a boot option with a ? mark in place of win xp .If I click on that it gives me a "NTLDR missing " msg. I tried connecting CAT5 cable between old and new pc and tried connecting my laptop with USB cable but nothing happend and then I realozed the modem doesnt have a WORKING usb driver for LINUX :( .FCUK ! .Freebsd doesnt` even detect the LAN cable if I use it for old pc . So basically I have a old pc that has FREEBSD which I can olny start and stare at the blank terminal console but works perfectly otherwise .FREEBSD was supposed to detect the LAN cable ??.And I have a laptop that has LINUX which only works if I connect it with a CAT5 cable .wtf . So what can I do with my old pc ??? any local server (if possible :( ) or some such thing ? or can u suggest any use .Im 18 and im into learning programming , coding .So I can practice it .Thankx !

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• Why is my Mac not displaying anything to my LCD tv using HDMI?

  - by Pure.Krome

  Hi folks, I've got an iMac desktop computer. Love it. I wish to connect it to my LCD TV using HDMI. There is no HDMI output on the iMac so i had to buy one of these bad boys :- so now I can output video (via the mini Display Port) and sound (via USB) through this box, to my LCD. Works great ... with a single direct cable. I have another 3 or 5 metre cable inserted into my wall, so i do not have to have a silly hdmi cable floating in the air between my iMac and my LCD TV. When I do this, there is no picture. To better explain all of this, i made a quick video explaining my problem in detail, so you can exactly see what is going on/wrong. I've also tried changing the output format for the TV from 1080i down to 720p and even lower .. incase the cable in the wall doesn't allow 1080i. here's the video with the full explanation :- http://www.youtube.com/watch?v=ZkKRKnRIh6Q (NOTE: I incorrectly said in the video that the hidden wall cable is 10 metres long. me == fail. It's 3m or 5m...). Can someone please watch it and suggest some ideas to getting it working?

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• VPN into multiple LAN Subnets

  - by Rain

  I need to figure out a way to allow access to two LAN subnets on a SonicWall NSA 220 through the built-in SonicWall GlobalVPN server. I've Googled and tried everything I can think of, but nothing has worked. The SonicWall NSA management web interface is also very unorganized; I'm probably missing something simple/obvious. There are two networks, called Network A and Network B for simplicity, with two different subnets. A SonicWall NSA 220 is the router/firewall/DHCP Server for Network A, which is plugged into the X2 port. Some other router is the router/firewall/DHCP server for Network B. Both of these networks need to be managed through a VPN connection. I setup the X3 interface on the SonicWall to have a static IP in the Network B subnet and plugged it in. Network A and Network B should not be able to access each other, which appears the be the default configuration. I then configured and enabled VPN. The SonicWall currently has the X1 interface setup with a subnet of 192.168.1.0/24 with a DHCP Server enabled, although it is not plugged in. When I VPN into the SonicWall, I get an IP address supplied by the DHCP Server on the X1 interface and I can access Network A remotely although I do not have access to Network B. How can I allow access to both Network A and Network B to VPN clients although keep devices on Network B from accessing Network A and vice-versa. Is there some way to create a VPN-only subnet (something like 10.100.0.0/24) on the SonicWall that can access Network A and Network B without changing the current network configuration or allowing devices on both netorks "see" each other? How would I go about setting this up? Diagram of the network: (Hopefully this kind of helps) WAN1 WAN2 | | [ SonicWall NSA 220 ]-(X3)-----------------[ Router 2 ] | | (X2) 192.168.2.0/24 10.1.1.0/24 Any help would be greatly appriciated!

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• How to connect via SSH to a linux mint system that is connected via OpenVPN

  - by Hilyin

  Is there a way to make SSH port not get sent through VPN so when my computer is connected to a VPN, it can still be remoted in via SSH from its non-VPN IP? I am using Mint Linux 13. Thank you for your help! This is the instructions I followed to setup the VPN: Open Terminal Type: sudo apt-get install network-manager-openvpn Press Y to continue. Type: sudo restart network-manager Download BTGuard certificate (CA) by typing: sudo wget -O /etc/openvpn/btguard.ca.crt http://btguard.com/btguard.ca.crt Click on the Network Manager icon, expand VPN Connections, and choose Configure VPN A Network Connections window will appear with the VPN tab open. Click Add. 8. A Choose A VPN Connection Type window will open. Select OpenVPN in the drop-down menu and click Create.. . In the Editing VPN connection window, enter the following: Connection name: BTGuard VPN Gateway: vpn.btguard.com Optional: Manually select your server location by using ca.vpn.btguard.com for Canada or eu.vpn.btguard.com for Germany. Type: select Password User name: username Password: password CA Certificate: browse and select this file: /etc/openvpn/btguard.ca.crt Click Advanced... near the bottom of the window. Under the General tab, check the box next to Use a TCP connection Click OK, then click Apply. Setup complete! How To Connect Click on the Network Manager icon in the panel bar. Click on VPN Connections Select BTGuard VPN The Network Manager icon will begin spinning. You may be prompted to enter a password. If so, this is your system account keychain password, NOT your BTGuard password. Once connected, the Network Manager icon will have a lock next to it indicating you are browsing securely with BTGuard.

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• Good HTTP Monitoring tools

  - by ffffff

  I look for HTTP to work with a Linux system server monitor tool every protocol. I know, and will not there be it in whom or a freeware? When, for example, I dump 80/tcp with a packet monitor to be concrete # tethereal -i ppp0 port 80 -x Capturing on ppp0 1244206390.030474 219.111.xx.xx -> 74.125.xx.xx HTTP GET /search?output=js&num=0&dt=1244206414703&client=pub-3031568651010206&q=Cagliari%20Flight&ad=n3&ie=utf8&oe=utf8&channel=0091594208&adtest=off HTTP/1.1 0000 00 04 02 00 00 00 00 00 00 00 00 00 00 00 08 00 ................ 0010 45 00 01 e5 ee 82 40 00 40 06 d2 b5 db 6f 02 5b E.....@[email protected].[ 0020 4a 7d 4f 93 d4 29 00 50 3e df 4c 63 4b 6b 42 e0 J}O..).P>.LcKkB Such output is provided, but there is too much unnecessary information such as an SYN packet or a header. What I want The IP address of the client and sending out character string(Get; the contents of the POST) Among the output character string of the server only as for the HTML (Content-Type:) I am what is chisel) of a thing of text/html. I can set a filter and am the best if only information wanting can accumulate in the log.

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• How can I stop SipVicious ('friendly-scanner') from flooding my SIP server?

  - by a1kmm

  I run an SIP server which listens on UDP port 5060, and needs to accept authenticated requests from the public Internet. The problem is that occasionally it gets picked up by people scanning for SIP servers to exploit, who then sit there all day trying to brute force the server. I use credentials that are long enough that this attack will never feasibly work, but it is annoying because it uses up a lot of bandwidth. I have tried setting up fail2ban to read the Asterisk log and ban IPs that do this with iptables, which stops Asterisk from seeing the incoming SIP REGISTER attempts after 10 failed attempts (which happens in well under a second at the rate of attacks I'm seeing). However, SipVicious derived scripts do not immediately stop sending after getting an ICMP Destination Host Unreachable - they keep hammering the connection with packets. The time until they stop is configurable, but unfortunately it seems that the attackers doing these types of brute force attacks generally set the timeout to be very high (attacks continue at a high rate for hours after fail2ban has stopped them from getting any SIP response back once they have seen initial confirmation of an SIP server). Is there a way to make it stop sending packets at my connection?

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• Windows 7 - Can't get my TV working as primary display with nVidia 7900GS

  - by Daniel Schaffer

  I just installed Windows 7 Ultimate 64 RTM (from MSDN) on my HTPC, which is connected to a 42" Magnavox LCD TV via component cables to my nVidia 7900GS. Everything was fine through the installation until I went to install the official driver from nVidia. Towards the end of the installation, the TV blinked off and wouldn't come back on. I went and got an LCD monitor and plugged it into a DVI port and the monitor came right up, but was automatically selected as the primary display. Now, if I set the TV to be the primary display, the TV just blanks until I hit escape to cancel the "settings have changed, do you want to keep them" dialog. Any suggestions? Update: I'm able to set the TV as the primary display using the Windows 7 "screen resolution" configuration panel. However, if I try to remove the LCD monitor either by unplugging it or using the configuration, the TV blanks out again. Update 2: This setup was working correctly in Vista Home Premium 32-bit. Update 3: I've uninstalled the nVidia driver and am using the driver that Windows Update installed. As much as this offends my geek sensibilities (must use the "right" driver!!), well, It Works™.

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• Openvpn - stuck on Connecting

  - by user224277

  I've got a problem with openvpn server... every time when I trying to connect to the VPN , I am getting a window with login and password box, so I typed my login and password (login = Common Name (user1) and password is from a challenge password from the client certificate. Logs : Jun 7 17:03:05 test ovpn-openvpn[5618]: Authenticate/Decrypt packet error: packet HMAC authentication failed Jun 7 17:03:05 test ovpn-openvpn[5618]: TLS Error: incoming packet authentication failed from [AF_INET]80.**.**.***:54179 Client.ovpn : client #dev tap dev tun #proto tcp proto udp remote [Server IP] 1194 resolv-retry infinite nobind persist-key persist-tun ca ca.crt cert user1.crt key user1.key <tls-auth> -----BEGIN OpenVPN Static key V1----- d1e0... -----END OpenVPN Static key V1----- </tls-auth> ns-cert-type server cipher AES-256-CBC comp-lzo yes verb 0 mute 20 My openvpn.conf : port 1194 #proto tcp proto udp #dev tap dev tun #dev-node MyTap ca /etc/openvpn/keys/ca.crt cert /etc/openvpn/keys/VPN.crt key /etc/openvpn/keys/VPN.key dh /etc/openvpn/keys/dh2048.pem server 10.8.0.0 255.255.255.0 ifconfig-pool-persist ipp.txt #push „route 192.168.5.0 255.255.255.0? #push „route 192.168.10.0 255.255.255.0? keepalive 10 120 tls-auth /etc/openvpn/keys/ta.key 0 #cipher BF-CBC # Blowfish #cipher AES-128-CBC # AES #cipher DES-EDE3-CBC # Triple-DES comp-lzo #max-clients 100 #user nobody #group nogroup persist-key persist-tun status openvpn-status.log #log openvpn.log #log-append openvpn.log verb 3 sysctl : net.ipv4.ip_forward=1

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• How to connect the virtual networks of vmware guests running on different hosts?

  - by gyrolf

  In a test setup, we are running several virtual machines on a single vmware workstation host. All virtual machines are connected via a "host only" network. This runs fine up to 2 or 3 virtual machines (depending on the host hardware). To allow more virtual machines, we want to use more host machines. Details about the environment and applications: Host PCs are running Windows XP in a corporate intranet. VMware used is Workstation 6.5 Guests are running Windows Server 2003 All guests act as Web Servers One of the guests additionally acts as Windows File server, offering shared folders for the other guests to connect to. Restrictions: VMware guests shall not be visible from the intranet. Changes to the host PC are restricted by corporate policy. In the virtual network, no domain controller exists. All virtual machines are member of the same workgroup. Running the virtual network as NAT is possible. Port forwarding might be used if it does not conflict with ports used by the host PC. Looking for a solution, I found hints about using router or vpn software on the hosts, but without any details how to setup. (I found a similar question Sharing the network between 2 VMware hosts, but the answer was not sufficient for me.)

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• Ubuntu 10.04 network manager issues

  - by Shark

  I was using the default network manager to connect to my wi-fi network, but if the connection is dropped or router restarted the network manager wont reconnect automatically after i guess a couple of tries and just gives a pop-up to connect manually . To avoid this annoyance I installed WICD but though it does try to reconnect to the network after a drop in connection it is unable to resolve the ip address and i am left with an even bigger annoyance . 1. Is there a way to counter either of these issues ? 2. Something like a background process that will check network status periodically and then try to connect to a favored network ? Edit- out put of lshw -C network *-network description: Wireless interface product: Broadcom Corporation vendor: Broadcom Corporation physical id: 0 bus info: pci@0000:12:00.0 logical name: eth1 version: 01 serial: c0:cb:38:18:9b:7f width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=wl0 driverversion=5.60.48.36 ip=192.168.11.2 latency=0 multicast=yes wireless=IEEE 802.11 resources: irq:17 memory:fbc00000-fbc03fff *-network description: Ethernet interface product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller vendor: Realtek Semiconductor Co., Ltd. physical id: 0 bus info: pci@0000:13:00.0 logical name: eth0 version: 02 serial: f0:4d:a2:94:2d:74 size: 10MB/s capacity: 100MB/s width: 64 bits clock: 33MHz capabilities: pm msi pciexpress msix vpd bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half latency=0 link=no multicast=yes port=MII speed=10MB/s resources: irq:29 ioport:e000(size=256) memory:d0b10000-d0b10fff(prefetchable) memory:d0b00000-d0b0ffff(prefetchable) memory:fb200000-fb21ffff(prefetchable)

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• Nginx Ubuntu Postfix Config - Can't connect to incoming IMAP server 'server not responding' but can send mail via outgoing using same details?

  - by daveaspinall

  I'm pretty to new server admin and especially nginx but seem to be getting ok fine apart from accessing my mail via my iPhone? I've changed my domain to 'domain.com' The thing is I can send mail via my outgoing IMAP server but can't connect to the incoming one? I just get the message "the mail server at mail.domain.com is not responding" /etc/postfix/main.cf alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no broken_sasl_auth_clients = yes config_directory = /etc/postfix home_mailbox = Maildir/ inet_interfaces = all inet_protocols = all mailbox_command = mailbox_size_limit = 0 mydestination = domain.com, mail.domain.com, localhost.com, , localhost, localhost.localdomain mydomain = domain.com myhostname = mail.domain.com mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 myorigin = /etc/mailname recipient_delimiter = + relayhost = smtp_tls_note_starttls_offer = yes smtp_tls_security_level = may smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination smtpd_sasl_auth_enable = yes smtpd_sasl_local_domain = smtpd_sasl_security_options = noanonymous smtpd_tls_CAfile = /etc/ssl/certs/cacert.pem smtpd_tls_auth_only = no smtpd_tls_cert_file = /etc/ssl/certs/smtpd.crt smtpd_tls_key_file = /etc/ssl/private/smtpd.key smtpd_tls_loglevel = 1 smtpd_tls_received_header = yes smtpd_tls_security_level = may smtpd_tls_session_cache_timeout = 3600s tls_random_source = dev:/dev/urandom telnet localhost 25 ehlo locahost 250-mail.domain.com 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-STARTTLS 250-AUTH LOGIN PLAIN 250-AUTH=LOGIN PLAIN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN Using the following details to connect: username password hostname: mail.domain.com port: 25 iptables --list Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination I also sent mail to the server as a test and got this missage if it helps? Technical details of temporary failure: [mail.domain.com. (10): Connection refused] I also looked in /var/log/mail.log and it has multiple entries of: postfix/smtpd[12239]: connect from 5acefc9a.bb.sky.com[90.206.252.xxx] Mar 23 06:47:09 new-domain postfix/smtpd[12239]: lost connection after CONNECT from 5acefc9a.bb.sky.com[90.206.252.154] Notice new-domain which is incorrect but the server hostname and hostname in the configs are correct? I recently moves servers and the host has set the primary domain on the service as new-domain.com so this may be the issue? Like I said, it works to connect to outgoing server, but incoming gets the not responding error? Any idea would be much appreciated!

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• Why is ssh agent forwarding not working?

  - by J. Pablo Fernández

  In my own computer, running MacOSX, I have this in ~/.ssh/config Host * ForwardAgent yes Host b1 ForwardAgent yes b1 is a virtual machine running Ubuntu 12.04. I ssh to it like this: ssh pupeno@b1 and I get logged in without being asked for a password because I already copied my public key. Due to forwarding, I should be able to ssh to pupeno@b1 from b1 and it should work, without asking me for a password, but it doesn't. It asks me for a password. What am I missing? This is the verbose output of the second ssh: pupeno@b1:~$ ssh -v pupeno@b1 OpenSSH_5.9p1 Debian-5ubuntu1, OpenSSL 1.0.1 14 Mar 2012 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: Applying options for * debug1: Connecting to b1 [127.0.1.1] port 22. debug1: Connection established. debug1: identity file /home/pupeno/.ssh/id_rsa type -1 debug1: identity file /home/pupeno/.ssh/id_rsa-cert type -1 debug1: identity file /home/pupeno/.ssh/id_dsa type -1 debug1: identity file /home/pupeno/.ssh/id_dsa-cert type -1 debug1: identity file /home/pupeno/.ssh/id_ecdsa type -1 debug1: identity file /home/pupeno/.ssh/id_ecdsa-cert type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1 debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.9p1 Debian-5ubuntu1 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: sending SSH2_MSG_KEX_ECDH_INIT debug1: expecting SSH2_MSG_KEX_ECDH_REPLY debug1: Server host key: ECDSA 35:c0:7f:24:43:06:df:a0:bc:a7:34:4b:da:ff:66:eb debug1: Host 'b1' is known and matches the ECDSA host key. debug1: Found key in /home/pupeno/.ssh/known_hosts:1 debug1: ssh_ecdsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,password debug1: Next authentication method: publickey debug1: Trying private key: /home/pupeno/.ssh/id_rsa debug1: Trying private key: /home/pupeno/.ssh/id_dsa debug1: Trying private key: /home/pupeno/.ssh/id_ecdsa debug1: Next authentication method: password pupeno@b1's password:

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• Server 2008 R2 & Domain Trusts - Attempt to Compromise Security

  - by SnAzBaZ

  We have two separate Active Directory domains; EUROPE and US. There is a two way trust between the domains / forests. I have a group of users called "USA Staff" that have access to certain shares on servers in the EUROPE domain and a group called "EUROPE Staff" which have access to shares in the USA domain. Recently the USA PDC was upgraded to Windows Server 2008 R2. Now when I try to access a share on a USA server from a Windows 7 workstation in the EUROPE domain I get the "Please enter your username / password" dialog box appear, with a message at the bottom: "The system has detected a possible attempt to compromise security." When I enter a username / password for a user in the USA domain, I can then access the network resource. Entering credentials for a EUROPE user however does not give me access, even though my NTFS and Share permissions are set to allow that. Windows Server 2003 / Windows Server 2008 did not have this problem, it seems to be unique to R2. I found KB938457 and opened up port 88 on the Server 2008 R2 firewall but it did not make any difference. Any other suggestions as to what to turn off in R2 to get this working again ? Thanks

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• Can not boot windows XP from cloned hard disk - what can I do?

  - by Martin

  My configuration: a PC (some years old) with MSI K8N-Neo-4F Motherboard, 1 GB RAM. Disk 1 (Maxtor, SATA II, 250 GB): 2 Partitions, on Partition 1 (48 GB): Windows XP Professional (NTFS) on Partition 2 (190 GB): data (NTFS) I wanted to have a larger and faster disk (the PC is incredibly slow and permanently the disk is rattling when I try to open an application or during Windows startup), so I took Disk 2 (Seagate, Sata II, 500 GB), installed in the PC, created at first a 400 GB-partition at the end of the disk and cloned the data to it, which worked well Installed a swap partition and a partition for Ubuntu Linux 12.10 on the first "part" of the disk so I was able to boot Linux and the old Windows XP with the Linux "System selection" at startup. Now I wanted to move Windows XP to the new disk, deleted the Linux partitions cloned Windows XP to the new disk (with free tools - EASESUS), left both disks in the PC and tried to select the new hard drive during boot as boot partition. This did not work, the PC refused to boot from this second disk. I tried many things like making the boot partition on the 2nd drive "active" in the Windows System Preferences modifying the boot.ini file to boot from the second disk - tried to boot from it, but ended with an error message stating that it was not possible to boot from this disk because of a hardware failure or something else or so removing the original disk and plugging the new one on the same SATA port as the original one - also booting failed with an error message repairing the MBR by booting into recovery mode from the Windows XP Installation CD-ROM, selecting the second disk and doing "FIXMBR" which said that everything was fine with the MBR. after that at least the PC tried to boot from the newer disk and then startup was hanging during the blue screen with the Windows Logo.... no luck. ... deleting the cloned partition and cloning again - this time with Macrium Reflect Free version... - no success during booting. I tried a lot of things with no success, so I wonder what I am doing wrong?! What could I do to successfully clone my Win XP partition to replace the original disk by a larger one which is bootable.

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• Connection timed out on Node.js app running under CentOS

  - by ss1271

  I followed this tutorial to create a simple node.js app on my CentOS: the node.js version is: $ node -v v0.10.28 Here's my app.js: // Include http module, var http = require("http"), // And url module, which is very helpful in parsing request parameters. url = require("url"); // show message at console console.log('Node.js app is running.'); // Create the server. http.createServer(function (request, response) { request.resume(); // Attach listener on end event. request.on("end", function () { // Parse the request for arguments and store them in _get variable. // This function parses the url from request and returns object representation. var _get = url.parse(request.url, true).query; // Write headers to the response. response.writeHead(200, { 'Content-Type': 'text/plain' }); // Send data and end response. response.end('Here is your data: ' + _get['data']); }); // Listen on the 8080 port. }).listen(8080); However, when I uploaded this app onto my remote server (assume the address is 123.456.78.9), I couldn't get access to it on my browser http://123.456.78.9:8080/?data=123 The browser returned Error code: ERR_CONNECTION_TIMED_OUT. I tried the same app.js code which runs fine on my local machine, is there anything I am missing? I tried to ping the server and its address was reachable. Thanks.

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