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• Exchange Disconnecting on EHLO with remote telnet

  - by Timothy Baldridge

  When I go to the local terminal on my Exchange box (SBS 2008) I can do this: telnet 127.0.0.1 25 220 Exchange banner here EHLO example.com 250 Server name However when I go from another box, or from the actual IP of the server I get this: telnet 192.168.21.20 25 220 Exchange banner here EHLO example.com 421 4.4.1 Connection timed out Connection to host lost. The odd thing is, this server is currently in production and working fine (receiving mail for our entire domain). But my C# programs can't send mail to it (they get this same error). Any ideas?

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• Bridging VirtualBox over OpenVPN TAC adapter on Windows

  - by Sean Edwards

  I'm trying to configure a virtual machine (VirtualBox guest running Backtrack 4) with a bridged adapter over a VPN connection. The VPN is is hosted by the cybersecurity club at my university, and connects to a sandboxed LAN designed for penetration testing against various servers that the club has built. My host (Windows 7 Ultimate) connects to the VPN fine and is assigned an IP through DHCP, but for some reason the VM can't do the same thing, and I'm not sure why. It's like OpenVPN is filtering out packets from the MAC address it doesn't recognize. I want the virtual machine to bridge over the VPN connection, because our IT office has very strict policies about what you can and can't do on the network. I want to be able to run active attacks (ARP spoofing, nmap, Nessus scans) in the sandbox environment without risking the traffic accidentally going over the university network and getting my internet access revoked. Bridging over the VPN connection and running all attacks from inside the VM would solve that problem. Any idea why the host can use this interface, but the VM can't?

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• Windows server 2008 rejecting packets from client

  - by l46kok

  We deployed a server application in .NET 4.0 that is going to run on Windows Server 2008 R2. Strangely, the clients cannot connect to the server given an external IP and the server port. I've ran wireshark diagnostics on the server computer and verified that the packets are arriving to the NIC without any issue so it seems Windows Server 2008 is the culprit here. I've tried to temporarily disable the firewall and add the server port into inbound/outbound rule but it still doesn't solve the issue. How can I solve this issue?

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• Netgear Wireless-n 150 wrn1000v2

  - by Jordan

  I'm not sure if this is the place to ask this question, move it if it's not. I'm trying to fix a wireless network. It only connects to a few devices and when it does work the connection is spotty. The router is a netgear wireless-n 150 wrn1000v2. Connecting to the router isn't a big problem, but connecting to the internet via WiFi is. I can't upgrade the firmware becuase it is from Comcast and it seems as though they only allow their versions of the firmware. I've monitored the network with wireshark and I see that the devices that are having trouble connecting are constantly asking "who is 192.168.1.1 tell 192.168.1.x" where x is the ip for the device. 192.168.1.1 is the router. This is from running wireshark on the wireless device. What does this mean. At this point I feel like buying a new router is the only option.

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• accessing a web server from the LAN and WAN

  - by jessh

  My router does not support loopback. In order to view a webpage on my server, I either have to type in the local ip (192.168.1.201), or be on another network. What are my options for making this easier? Here are some possible things: Route all web traffic through an external proxy (seems to be overkill) Run my own DNS server (where to start?!) Buy a new router that supports loopback. Surely there is another way that I can use my laptop on the LAN and the WAN by typing in my domain more easily than these solutions.

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• Should I consolidate multiple identical VMs into BSD jails?

  - by Josh

  We run a number of Openfire XMPP/Jabber servers. Due to the way Openfire works, we cannot easily run multiple Openfire instances on one server, so I have 5 identical VMware ESXi VMs, each with CentOS, MySQl, Java, and Openfire. They're the exact same, except for their IP addresses, the actual Openfire MySQL database and it's config file. I am wondering if this is the optimal configuration, or if it would be better to move these VMs to a single FreeBSD machine and put each one inside a FreeBSD jail. Specifically, I am wondering if the benefit of VMWare's Transparent Page Sharing (TPS) would outweight the cost of running 5 identical OSes. Would I end up using less memory with one large FreeBSD machine and java running in bsd jails?

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• Slow internet using Arch Linux

  - by GZaidman

  after a week or so of using Arch Linux I cant access the internet - it takes around 5 mins to load google (most of the other websites just give me a timeout), pacman's downloading speed range between 5-2Kbs, and pinging google takes around 9Kms. I'm connected using wireless network (wifi card is Intel Ultimate 6300 and router is Edimax 6524n). Every other Windows machine that's connected to the network (and even the T410 running Windows) is fine, so the problem lies in Linux. So far, i checked the resolv.conf file (my router ip address is listed), and the hosts file (pretty much default), and I disabled the ipv6 module. None of that helped. PS: i'm using NetworkManager (but the problem still occurs when connecting using wicd) running on Gnome3. Thanks in advance for any help you can provide! EDIT: something really strange happens whenever I ping google: i get an unknown host 'google.com', but the bit rate from the card jumps at the exact second I ping google (so far, the bit rate jumped to 54Mb/s from 1Mb/s over the course of 4 pings).

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• Need help setting up mail DNS records

  - by Dave

  Hi, We are hosting our web site on host monster, but want our email to continue to be hosted at the old site. Our domain points to the hostmonster DNS servers, but I can't figure out the right configuration for the remote email servers. We have one MX entry, which is priority: 0 domain: ourdomain.com And then we have these DNS entries ... name: mail.ourdomain.com ttl: 14400 class: IN type: A record: old.host.ip.address name: mail1.ourdomain.com ttl: 14400 class: IN type: A record: old.host.secondip.address Can someone tell me what I need to add/edit to get mail to correctly route to our old host? Thanks, - Dave

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• After low level formatting can microsoft track previously pirated windows installed on pc

  - by Neelabh

  I am getting call from Microsoft and they are forcing me to purchase so many licensed software but my budget is not that much.. So they are asking for On-Site Audit (SAM Review)... So I did low level formatting of my All PC's and Installed Ubuntu. So can they track I installed pirated windows xp earlier on these system or I need to change hardware.. After formatting on what parameter Microsoft Track earlier piracy: 1) By any Harddisk ID 2) By any Motherboard ID 3) By any IP Address Please help me otherwise I have to borrow so much money for licensing fee. Thanks in Advance..

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• Domain connection shows as "unauthenticated"

  - by gareth89

  I have seen various different questions for this problem floating around but either the circumstances arent the same or the solution doesnt work so thought i would post it to see if anybody has any suggestions. Various domain PCs and laptops appear to randomly give the connection name of "lewis.local 2(Unauthenticated)" - lewis.local being our domain - and provides an exclamation mark where the network type logo is normally shown. This also appears to happen every time connecting via vpn. Our setup is: 2 servers both running windows server 2003 R2 (x32) main server has AD, DNS and DHCP installed IPv4 on approx 30 client machines (some wired, some wireless) If anybody has any thoughts on solutions i would appreciate it. I have tried removing all but AD server roles, resetting all of the systems and nothing. It doesnt prevent anything from working just like a domain connection most of the time however it is getting fustrating! Also dont know if it could have anything to do with it but the DHCP server seems to have quite a long lead time on issuing the IP address to the client.

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• I cannot access my mongodb from internet ,Anybody can help me?

  - by VicoWu110

  I am using Mongodb database ,which is installed in my ubuntu with the ip address 126.22.252.25. The ubuntu version info is Ubuntu 12.04.3 LTS. My mongodb use the default 27017 port .On this local machine , I can use command "mongo --host 126.22.252.25" on the local machine to access, but I cannot use this command on any other linux mathine to access the db,nor can I use "telnet 126.22.252.25 27017" on my windows machine.I am sure 126.22.252.25 machine is accessable from internet because I can use winSCP and secureCRT to login to it.I run command "netstat -tnlp" , it shows below: tcp 0 0 0.0.0.0:27017 0.0.0.0:* LISTEN I have already change the /ect/mongodb.conf file , modifying bind_ip parameter from 0.0.0.0 to 126.22.252.25 So ,anyone can help me?

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• Detecting man-in-the-middle attacks?

  - by Ilari Kajaste

  There seem to be many possible ways to create man-in-the-middle attacks on public access points, by stealing the access point's local IP address with ARP spoofing. The possible attacks range from forging password request fields, to changing HTTPS connections to HTTP, and even the recently discovered possibilit of injecting malicious headers in the beginning of secure TLS connections. However, it seems to be claimed that these attacks are not very common. It would be interesting to see for myself. What ways are there to detect if such an attack is being attempted by someone on the network? I guess getting served a plain HTTP login page would be an obvious clue, and of course you could run Wireshark and keep reading all the interesting ARP traffic... But an automated solution would be a tiny bit more handy. Something that analyzes stuff on the background and alerts if an attack is detected on the network. It would be interesting to see for myself if these attack are actually going on somewhere.

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• Setting Up Multiple Domains (plus wildcard subdomains) to Point to the Same Site/VirtualHost

  - by Derek Reynolds

  I have my primary domain with wildcard subdomains setup already. username.maindomain.com and maindomain.com I want to provide my users with additional domains that they can select. additional1.com, additional2.com, additional3.com... These additional domains would also need to support wildcard subdomains (as the subdomains route to a username). Anyone know how to properly configure this in DNS and VirtualHost config? Currently I have the additional domains as A records pointing to the same IP as my main domain (with a wildcard subdomain A record for each as well). In my VirtualHost config I am placing the additional domain names in the ServerAlias directive. Let me know if any more detail is needed.

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• configure /etc/hosts file so ALL applications always use local network when it makes sense to do so?

  - by gkdsp

  I have two Linux CentOS servers setup in a local network. ServerA is 192.168.0.1 and serverB is 192.168.0.2. There's an application on serverA that communicates with serverB using host2.serverAname.com. But, the traffic is blocked on serverB because the port being used has a firewall that only allows traffic on the local network to pass. Thus, serverB needs to see traffic from serverA as originating from 192.168.0.1 (instead of host2.serverA.com). Is there a way I can configure the /etc/hosts file to ensure traffic always sent between the two servers uses local IP addresses, regardless of what hostname is in use, and for ALL applications? If so, could someone walk me through an example? I only have 2 servers, so the simpler the better.

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• Azure cloud app subdomain pointing to actual domain

  - by Amit Aggarwal

  Say we have a domain xyz.com registered with some registrar ... we pointed that domain to the name server of our dedicated server where the DNS will be hosted for that domain. Now, we just want that dedicated server to host the emails coming and the domain will point to abc.cloudapp.net (azure cloud app, they don't provide any static IP ... and only public url is given) Now, someone please helping me in editing/creating the DNS file on our dedicated server to make sure things work properly... if possible past here minimum settings we need in DNS file to make sure mails are on dedicated server and app is on cloud... Thanks, Amit

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• DNS resolution over DHCP

  - by Eric

  I have a m0n0wall router a VMWare workstation running ubuntu a windows 7 workstation running the VM The ubuntu hostname is "renraku" From the windows machine I can't resolve dns automatically for this host. For example, when I ping renraku Ping request could not find host renraku. Please check the name and try again. However nslookup seems to work nslookup renraku Server: m0n0wall.local Address: 192.168.123.254 Name: renraku Address: 192.168.123.248 I don't get how to have ping to work with hostnames. The main goal behind this is to have my web server to work with hostnames instead of ip addresses EDIT : ping 192.168.123.248 works

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• DHCP over WiFi on CentOS 6 [closed]

  - by dongle26

  Using CentOS 6 I cannot get my WiFi interface to configure over DHCP. Here is my ifcfg-wlan0: This does not work (although it is correct): DEVICE=wlan0 BOOTPROTO=dhcp ONBOOT=yes HWADDR=xx:xx:xx:xx:xx:xx TYPE=Wireless This works: DEVICE=wlan0 BOOTPROTO=none ONBOOT=yes IPADDR=192.168.0.253 NETMASK=255.255.255.0 DNS1=192.168.0.99 GATEWAY=192.168.0.99 HWADDR=xx:xx:xx:xx:xx:xx TYPE=Wireless I don't want a static IP address, I want a DHCP assigned address. Update: Both of the above configs are correct. Please don't downvote, this really didn't work for me. It must be a bug in CentOS or my wireless driver. See my answer for details.

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• IIS 7.5 doesn't load static html pages

  - by Kizz

  There is an IIS 7.5 freshly installed on a dedicated server. ASP.NET 4.0 Web app copied to its folder, new website is created on its own IP on post 80, IIS_IUSR and IUSR accounts have read/execute rights on site's folder, the site is assigned to its own Integrated app pool with 4.0 .NET (I tried Classic pool with the same results). The problem: when I try to access this web site, browser only loads content generated by .NET resources such as aspx pages, .axd files, etc. Static images, static js, css and html files are in the page source but IIS doesn't serve them. Dev tools in all browsers complain that all those static resources have been sent by the server with wrong content type (plain text instead of image, styles, etc). What do I do wrong?

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• Setting up nginx on Ubuntu?

  - by Industrial

  Hi everyone, I've just setup a VPS running Ubuntu server 10.10 as a test environment to run with nginx. This far i've ran apt-get install nginx php5 php5-cgi and accessed the IP of the VPS with a browser which outputs It works, so it should be ready to run. Never having worked with nginx in the past, I have no idea on what to do next. How should I config my nginx install to run properly as a staging server in my LAN? Apparently, there's multiple configs for nginx including sites-default and nginx-default making me really confused.

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• What value does SenderID provide over SPF and DKIM?

  - by makerofthings7

  I understand that SPF "binds" a message envelope to a set of permitted IP addresses. SenderID (with the default pra option) "binds" the message header to a set of permitted IPs in addition to the SPF logic. DKIM "binds" the from address header (and any additional header the sender chooses), and the body to a DNS Domain name I'm using the word "bind" above instead of "authorized" because it makes more sense (to me) Questions: If SPF is already verifies a message FROM in the envelope, why is there a need to check the headers? When would the need to verify the envelope (SPF) need to be different than the headers (SenderID) If I'm already verifying the headers with DKIM, why do I need SenderID? Most large companies I've checked don't disable SenderID with an explicit record. EBay is a notable example of one that does. What is the rationale for disabling SenderID "pra" processing of outbound messages?

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• nameservers one domain one VPS and one VMCloud

  - by Dave

  I 'had' just a single VPS with nameservers ns1 & ns2.mydomain.com. I've now taken a VMCloud package as I need space etc. Ultimately I will carefully transfer all accounts from my VPS to Cloud but in the short term I'm running both. In the new WHM on Cloud I have set hostname bla.domian nameservers as ns3 & ns4.mydomain.com with the two new ip addresses. Question is do I need to do anything else - eg where mydomain.com is registered? I want ns1 & 2 point to VPS and ns3 & 4 to point to Cloud.

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• How to install NPM behind authentication proxy on Windows?

  - by Tobias

  I need to run the latest version of Node and NPM on Windows. I installed Node 0.5.8 and downloaded the sources of NPM from GitHub. The steps I followed to install NPM were listed on its GitHub site but I have a problem running the following command: node cli.js install npm -gf but it fails with the following error message: Error: connect UNKNOWN at errnoException (net_uv.js:566:11) at Object.afterConnect [as oncomplete] (net_uv.js:557:18) System Windows_NT 5.1.2600 command "...\\Node\\bin\\node.exe" "...\\npm\\cli.js" "install" "npm" "-gf" cwd ...\npm node -v v0.5.8 npm -v 1.0.94 code UNKNOWN I think that this is a problem because I need authentication at my proxy to connect to the Internet. But I found no way to tell the installer to use my credentials for login. Is there a possibility to provide my proxy IP and login information to npm installation maybe via command-line arguments? I can provide the full log (but seems to have no more relevant information) using pastebin if needed.

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• Cannot connect to Musicbrainz VirtualBox through SSH using Mac

  - by olovholm

  I am trying to connect my mac terminal shell to a VirtualBox running the Musicbrainz server. I have configured the network through a BridgeAdapter and running ifconfig on both the host and the guest show corresponding IP addresses. I can now ping the guest, but I cannot connect through SSH. The verbose output from the SSH client on my mac states: (olaenv)hf-79-202:Python oclovhol$ ssh -vv [email protected] OpenSSH_5.6p1, OpenSSL 0.9.8r 8 Feb 2011 debug1: Reading configuration data /etc/ssh_config debug1: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to 127.0.0.1 [127.0.0.1] port 22. debug1: Connection established. debug1: identity file /Users/oclovhol/.ssh/id_rsa type -1 debug1: identity file /Users/oclovhol/.ssh/id_rsa-cert type -1 debug1: identity file /Users/oclovhol/.ssh/id_dsa type -1 debug1: identity file /Users/oclovhol/.ssh/id_dsa-cert type -1 ssh_exchange_identification: Connection closed by remote host

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• How to change from own Internal/Extrernal DNS to use an outsourced service like DNS Made Easy?

  - by Joakim

  Our current setup is a co-located linux box with an openvz kernel with a handful virtual containers for www, mail etc. and one container run Bind9 with a split views configuration serving External and Internal DNS. The HW-Node runs a shorewall firewall and all containers uses private ip's. The box (and DNS) basically handles web and mail for a handful domains and it works well but we still think it would be a good idea to outsource the public DNS and now to my question... Although I am fairly comfortable with the server stuff and DNS, I'm far from a pro and guess I basically need some confirmation that I am thinking in the right direction in that I basically just move the content of our external view (with zone files) to the external service and keep the internal view (or actually remove the view), update the new external DNS with thier names servers, update the info at my registrar and wait for propagation or have I missed something? Maybe someone else here run something similar already and can share some exteriences? I found this question which at least confirms it can be done.

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• mod_proxy security

  - by brad

  I'm on Debian Lenny using apache2. in my proxy.conf I tried adding Allow from localhost as suggested in some other forums to get proxying to work. Didn't work. It only worked if I say Allow from all My question is this. Are there any security implications to this Allow from all directive? Most people were saying to make this as limited as possible, but "all" is the client right? I want anyone regardless of their IP to be forwarded properly. Is there a better way to configure this?

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