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• Problem with shared ssh keys

  - by warren

  Following the process I've used in other environments, I've tried setting-up shared keys between my Mac and my CentOS 4 webserver. I've seen the same problem with my older Ubuntu 7.10 workstation trying to connect via keys to the same webserver. I have tried both dsa and rsa keytypes (sshkeygen -t <type>). The sshd_config file on my webserver seems to be allowing key-based logins: RSAAuthentication yes PubkeyAuthentication yes AuthorizedKeysFile .ssh/authorized_keys And my .ssh/authorized_keys has my dsa and rsa keys added. Where should I be looking for what to change next to make key-based logins "Just Work™"? Is it related to the line, #UseDNS yes and sshd is trying to do a reverse-lookup on my IP, but cannot because it's NAT'd?

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• Cisco vlan entry missing in vlan.dat, but appears in running-config

  - by nLinked

  One of our vlan's (ID: 104) stopped working suddenly and computers on that vlan failed when trying to obtain a dhcp ip address. On the Cisco switch if we do show vlan, this command is supposed to shows the vlans in the vlan.dat file. We notice it has every other vlan except the one that is now missing. If we show the running-config or even the startup config, they DO show the missing vlan (as if everything is fine), but that vlan doesn't take effect. We tried deleting the "missing" vlan using clear vlan 104, but it says No subinterface configured for vLAN Identifier 104, so it's already missing. Recreating the vlan, saving and rebooting still doesn't add it into the vlan.dat or make the vlan work. The switch is in vtp server mode. Our startup config is here: http://pastebin.com/RHxxTG5p Any ideas appreciated.

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• Flexible traffic & bandwidth monitor

  - by BrNathan

  I have looked around, but have not found anything to meet our needs. I need something that can log all connections & bandwidth consumption. We need it for analysis: by protocol, source IP (& MAC if possible), destination, etc. Ideally we are looking for something that can produce custom graphs & also uses mysql. All connections go through one server on a bridged connection (2 network cards) so it is easy to pickup traffic. We are not concerned so much with internal LAN traffic as what passes in & out to the firewall. Thanks for you suggestions. Update: I use Ubuntu 10.04

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• Trying to administer network setting of server via netsh

  - by Jaime

  Hi there, I am trying to configure the LAN settings of a Windows 2008 server remotely via netsh. I've been trying this command (issued at the client) assuming the IP address of the server is 192.168.0.1: netsh -r 192.168.0.1 -u 192.168.0.1\Administrator -p password lan show config but I keep getting the following message: WARNING: Could not obtain host information from machine [192.168.0.1]. Some commands may not be available. The RPC server is unavailable. Am I understanding the command above properly? Is there a step or two that I missed in setting this up? Thanks in advance. P.S. The Routing and Remove Access service on the server is enabled.

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• Finding the A Record for a Home Server [closed]

  - by Ryan Allred

  I have a hosted website that allows me to add subdomains and point them to different locations on the server. I also know that I can change the 'A Record' to point it to a different IP address. Now, here's the question, I have a home server that I need to access though this hosted website's domain name. How would I go about setting up the 'A Record' on the server to point to my home server. I'm usually pretty good about keyword searches but on this one, I'm pretty lost as to what to search for.

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• VM can't connect to outside in bridged mode

  - by Kamal

  I am not able to ping any machine(not even the host) from Guest VM in bridged mode. But I got an IP which is on the same subnet as host. I can ping my guest VM from the host and can use ssh to connect to the guest. I am using Vmware workstation 6.5. Guest VM is a centos VM and host is windows xp. Every thing works fine in NAT mode. Any clues as to what could be happening. I tried disabling all the firewalls I have.

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• Windows Deployment Services

  - by timbrigham

  I have a slightly advanced Windows Deployment Services setup. My router hands out DHCP addresses, including the following config. ip dhcp pool Servers_100 network 192.168.100.0 255.255.255.0 bootfile boot\\x86\\pxelinux.0 next-server 192.168.100.50 default-router 192.168.100.1 dns-server 192.168.100.80 192.168.100.81 This works perfectly for other subnets - I have a couple screens in my pxelinux that allow me to select my various Linux installers or enter the windows preboot environment. For some reason I'm only receiving the default bootfile that opens to the windows preboot environment. Any idea why?

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• proxy/vpn by dns entry

  - by rcourtna

  I've been using a service by unblock-us.com, which provides a proxy to Canadians/others allowing access to services that are locked down to only US ip addresses. This is easy enough to achieve by setting up a reverse proxy (eg: squid) on a US-hosted server, and then configuring your browser or OS to use that proxy. However, there is something that unblock-us does that I'm not sure how to duplicate. Rather than configuring your OS to use them as a proxy, you can simply change the DNS Server settings on your router to point to their addresses. Any requests to services they support are automatically proxied. The advantage to this is that you don't have to set up every computer in your house, and it "just works" with clients like ps3, xbox, android, etc. Disadvantage is you really don't have control over what gets proxied, as well as there are privacy concerns I suppose. How can I achieve this same functionality on my own us-based slice?

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• mdadm email notification - change the default subject

  - by Shirker

  I have entry in my crontab 00 */1 * * * /sbin/mdadm --monitor --scan -1 [email protected] It works more than perfect, but I need to change the default email template. So instead of subject "mdadm monitoring" it wished to be "mdadm monitoring from «IP ADDRESS»" or like that. [root@mail ~]# rpm -ql mdadm-3.2.5-4.el6_4.2.x86_64 | grep -v -E '(man|doc)' /etc/cron.d/raid-check /etc/rc.d/init.d/mdmonitor /etc/sysconfig/raid-check /lib/udev/rules.d/65-md-incremental.rules /sbin/mdadm /sbin/mdmon /usr/sbin/raid-check /var/run/mdadm Is it hardcoded or its possible to change?

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• FileZilla Server Configuration Problems

  - by LiamB

  I've set-up FileZilla server a Windows 2008 Machine, I then created the user, password and added a share folder which I set to Home Directory. I then connect to the server from the client computer Status: Connecting to {IP} Status: Connection established, waiting for welcome message... Response: 220-Welcome To {NAME} FTP Response: 220 {DOMAIN} Command: USER {USER} Response: 331 Password required for {USER} Command: PASS ********* Response: 230 Logged on Status: Connected Status: Retrieving directory listing... Command: PWD Response: 257 "/" is current directory. Command: TYPE I Response: 200 Type set to I Command: PASV Response: 227 Entering Passive Mode ({}DATA) Command: MLSD The connection works fine, however no remote directory is selected, it shows as "/" however uploading any file fails. Any suggestions on how to debug this more?

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• Losing WLAN connections but maintaining internet connections on WIndows 7 Workgroup

  - by Di

  I have 4 computers all running Windows 7 networked in a Work group through Billion 7404vgp-m wireless router.All drivers and firmware for wireless adapters and router are up to date. Windows Firewall and Defender disabled.Disconnected ipv6. Running Nod 32 anti virus software. All have own static IP address 192.XXX.X.XXX. When I Reset the router all computers have Internet and LAN access for about 1 hour and then they will lose the LAN connection but maintain Internet connection. Resetting wireless adapters or restarting computers does nothing to fix this but resetting router will. What is causing this and how do I fix it. Thanks Di

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• Router stopping my python server

  - by drfrev

  This was originally posted in stackoverflow.com but it was suggested I move it here after it was realized it wasn't my code that was wrong. So my problem, very simply, is that I cannot get my computers that are connected to my router to communicate. example: If I ping a wireless computer I get no responce and the Request times out If I ping a computer wired to the modem directly it works fine. When I ping I use the local ip for each case. *if it helps my original post is here: http://stackoverflow.com/questions/12593024/python-cannot-go-over-internet-network/12593361#12593361 And some screen shots of different things are here: http://imgur.com/a/jUZ4G#3 thank you, any help is greatly appreciated. NOTE I am heading off to bed now, so I will respond around 6:00 AM EST if anyone posts some help

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• Windows 2008 RRAS and PPPoE

  - by Massimo

  I'm trying to use Windows Server 2008's Routing and Remote Access Server to share an ADSL connection which uses PPPoE, but I'm having no luck. I can setup the connection as a broadband Internet connection in Windows, and it works. I can share it using Internet Connection sharing, and it works (but it's not what I need). I have installed and enabled the Routing and Remote Access Service and configured it for NAT with a demand-dial interface; I create the aforementioned interface using PPPoE with the exact same parameters used on the Windows connection; I connected it, and it seems to work: I can also see it gets its public IP address and DNS assigned correctly. But it just doesn't work. The server has no Internet connectivity at all, and PINGing anything on the Internet results in a cryptic "general error". Any help?

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• workstation 7 and host-only no connectivity

  - by Steff

  hello, I have a WinXP 32 host (IBM T400) with VWware workstation 7 (7.0.1 build-227600) and some guest OS (Win xp, NT, etc.) I can ping from the host to guest OS and vice versa, but... every other "protocols" do not work at all. No http from host to guest, no CIFS, nothing, nothing, nothing. Windows firewall is turned off, TCP/IP filer is turned off. i re-installed VMware workstation, then the networking started working again, but, after some reboots... it stopped again. Connectivity among guest OS... it works FINE. Can not understand... problems exist just between host and guest. Host-only or NAT... it is the same. Any suggestion?

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• workstation 7 and host-only no connectivity

  - by Steff

  hello, I have a WinXP 32 host (IBM T400) with VWware workstation 7 (7.0.1 build-227600) and some guest OS (Win xp, NT, etc.) I can ping from the host to guest OS and vice versa, but... every other "protocols" do not work at all. No http from host to guest, no CIFS, nothing, nothing, nothing. Windows firewall is turned off, TCP/IP filer is turned off. i re-installed VMware workstation, then the networking started working again, but, after some reboots... it stopped again. Connectivity among guest OS... it works FINE. Can not understand... problems exist just between host and guest. Host-only or NAT... it is the same. Any suggestion?

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• Securing data sent to an unencrypted WiFi AP

  - by David Parunakian

  The business plan of a project I'm involved in assumes selling certain WiFi-enabled devices to end users. All these devices originally have an unencrypted connection and a standard SSID. The problem is that although the user can connect to it and set both a new SSID and a WPA passphrase, these are being sent to the AP in plain text and thus can be intercepted by anyone nearby with a sniffer. What's the best solution to this problem, and why? Initially set up an encrypted wireless network at the device and supply the user with a printed passphrase Buy an SSL certificate for the AP's default IP address or local domain name (the APs aren't supposed to work as a router and have a captive portal & dnsmasq installed, so all of them can pretend to be myunit.example.com, as far as I understand) Something different Thank you.

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• DNS Server Spoofed Request Amplification DDoS - Prevention

  - by Shackrock

  I've been conducting security scans, and a new one popped up for me: DNS Server Spoofed Request Amplification DDoS The remote DNS server answers to any request. It is possible to query the name servers (NS) of the root zone ('.') and get an answer which is bigger than the original request. By spoofing the source IP address, a remote attacker can leverage this 'amplification' to launch a denial of service attack against a third-party host using the remote DNS server. General Solution: Restrict access to your DNS server from public network or reconfigure it to reject such queries. I'm hosting my own DNS for my website. I'm not sure what the solution is here... I'm really looking for some concrete detailed steps to patch this, but haven't found any yet. Any ideas? CentOS5 with WHM and CPanel. Also see: http://securitytnt.com/dns-amplification-attack/

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• Squid 3 reloading makes it stop serving requests

  - by coredump

  So, we use Squid 3 here (3.0.STABLE8-3+lenny4), pretty standard configuration (no dansguardian or similar) + NTLM authentication with LDAP background, circa 1000 users on a busy day, and our acls reference some external files (allowed/blocked sites/ip addresses). On Squid 2.X we used to be capable of reloading it's configuration (to add or sites or addresses to rules, etc) and squid would not stop serving during the reload. Since we changed to 3.0, that seems to be impossible: everytime we use reload (or -k reconfigure) it stop serving requests for as long as 2 minutes, and clients receive a Configured proxy is not accepting connections message. I checked the documentation and got nothing about it, does anyone else suffer from this problem or is it a isolated case on my setup? Also, if you have Squid 3.0 and doesn't suffer from this problem, how is your squid configured?

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• linux dns server

  - by Clear.Cache

  Can someone explain to me how to easily setup a centos 5 (64bit) dns server? I want to use this strictly for dns for my clients who require rdns (ptr) for their domains. I do have IP delegation/authority from the data center and allocated IPs directly from ARIN. I just want to setup a Centos 5 box to use strictly as a dns server, perhaps with redundancy with a secondary, clustered (or not) dns server Server 1 = dns1.mycompany.com Server 2 = dns2.mycompany.com Then, I need simply instructions on how to create rdns records for clients upon request, especially in bulk amounts. Thank you.

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• Gradually migrate from one SMTP server to another

  - by Bart van Wissen

  I maintain an application that sends out a ton of e-mail on a daily basis. Soon, we will have to migrate to another SMTP-server for that, which has an ip address that has no reputation with respect to email delivery. So instead of just flipping the switch, I would like to start by sending a small percentage of all mail through the new server, and then gradually increase that percentage until we reach 100%. It wouldn't be very hard to implement something in the application itself, but I would like to know if there is an easier, more reliable out-of-the-box-type solution for this. My first thought was to use round-robin DNS for this, but the servers require different credentials, use different protocols (one uses SASL, the other doesn't) and even different port numbers, so I think that rules out the DNS based solution. Is there any way, for example, to configure Postfix to send 1 out of x e-mails to relay host A and the rest to relay host B? Or perhaps a different MTA?

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• Dual Home HP Server running Win2003

  - by Colm

  Hello everyone. I'm new to server dual homing. I have a HP ProLiant DL360 G4p running Win2003 with 2 NICs , only one is currently active. I'd like to activate the 2nd NIC connected (in a active/passive state) to a 2nd switch with only one IP address and ideally only one mac layer address. The 1st switch is a Cisco 2960G and the 2nd is a Cisco C3560G. There are VLANS, RSTP and PAGP in use already. Can someone give me an idea, in broad terms , of what technology/protocols I should be investigating (HSRP, SLB Teaming etc.) ? I can provide more info if needed. Thanks, Colm.

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• tcpdump selective acknowledgements question

  - by wlaus

  Hi All, I eventually sometimes watch most initial tcp connection attempts like this: tcpdump -nn -Z somepcapuser not src host (12x.x5.109.xxx or 62.75.160.xxx ) and not (port 9001 or 443 or 8080 ) and tcp[tcpflags]&(tcp-syn) !=0 and not tcp[tcpflags]& (tcp-ack) !=0 or icmp this works pretty well to quickly identify oddness so far. However, I now have a question on the following output: 03:53:52.227884 IP 203.81.166.20.53786 62.75.160.xxx.80: S 846930886:846930886(0) win 61690 "<"mss 1460,nop,nop,sackOK,opt-178:f04700000000,nop,wscale 4"" I wonder what the marked portion means, haven't seen that before. Thanks for help wlaus

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• Configuring TMUX's status bar

  - by wdkrnls

  I want my tmux session to show my current ip address in the right hand side of the status bar but I am having the hardest time figuring up the right syntax. The command works perfectly in the shell, but tmux won't parse it. set -g status-right '#[fg=white]#(host (hostname))' [Note: I am using the fish shell] I really want it to be: set -g status-right '#[fg=white]#(hostname)@#(host (hostname) | cut -d " " -f 4)' But since I can't get the former status bar to work, this is a lost cause. The weird thing is I got the first one to work once, but then I added the cut.

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• Restoring WordPress EC2 instance from snapshot results in 403 Forbidden error

  - by Eric Matthew Turano

  This problem has been perplexing me for weeks now. Here's how the issue goes: Launch Amazon Linux 64-bit instance, successfully install WordPress, and site is active w/ no issues Create snapshot of the instance's root volume Shut down instance Create volume from snapshot, attach to instance, and reboot instance Associate Elastic IP with instance Once that's done and I try logging onto the site, I am redirected to myurl.com/wp-admin/install.php and greeted with this message: Forbidden: You don't have permission to access /wp-admin/install.php on this server. Apache/2.2.25 (Amazon) Server at www.myurl.com Port 80 Port 80 is open on the inbound security group settings, so that's not the issue. Keep in mind all I am doing is merely creating a new volume and attaching it to the same instance, and this issue comes up. What am I doing wrong, and how can I create a complete backup of my instance without this error occuring?

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• Securing a Windows Server 2008 R2 Public Web Server

  - by Denny Ferrassoli

  I'm setting up a public web server: Windows Server 2008 R2, IIS7.5. Does anyone have a tutorial / walkthrough / tips on properly securing a public web server? I've seen a few tutorials but mostly focused on Windows Server 2003. What I've done so far: Created a specific user account for the website / app pool, Renamed Admin account, Installed FTPS, Configured firewall to block any non-public service (web / https), Configured firewall to allow access to management interfaces only from specific IP addresses (rdp, IIS management, ftp) Maybe a few other things but can't remember at the moment... ICMP is allowed... Should I disable all except ping? Port scan reveals only web and https ports. Any other suggestions? Thanks

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