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• Exim not sending email to our own email addresses

  - by RH01

  Here is a situation. We use google app for our emails. Our application is hosted at another host and this application sends out emails. The emails from the application are being sent fine to every email except our own email addresses. Lets say our domain name is example.com, the emails to [email protected] is not getting delivered, but they are getting stored locally on the box only. We are using exim as a mail server on the box where the application is deployed. We have also set up dc_relay_domains. What could be missing? How do we make sure that the email to email addresses of our own domain names get delivered?

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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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• Ubuntu - why would /var/log/dmesg stop updating after boot? does not show panic/cpu_hung errors which the console shows

  - by Tom G

  So I have an Ubuntu 10.04 install VM on a host. Latest 2.6.38-15-server kernel . /var/log/dmesg displays only the bootup but will stop recording after that. It will not show the trace/cpu_hung errors I am trying to troubleshoot. /var/log/dmesg.0 , dmesg.1 nothing - I did a string search for the text that displays on the console during the crash and NOTHING gets logged anywhere in /var/log/* . I have to call into the provider and ask them to take a screenshot of the console since nothing shows in dmesg. Why would /var/log/dmesg not record kernel panics, or such?

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• Keeps "SSH timeout" error in our AWS instance- how do i diagnose?

  - by ming yeow

  I am befuddled by this error. We keep failing to SSH into our AWS instance, whether it is is deployment or via console. I have tried rebooting a few times, but it does not seem to be helping. Here are a couple of error messages i keep getting. connection failed for: HOST.NAME.amazonaws.com (Errno::ETIMEDOUT: Operation timed out - connect(2)) 111.222.333.444: ssh connection failed at 2010-07-02 03:39:37 I also SSHed in when it was up, and monitored "top" when ssh times out. looking at the memory logs, it does not look like any program was hogging

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• How do I deny all requests not from cloudflare?

  - by phillips1012

  I've recently gotten denial of service attacks from multiple proxy ips, so I installed cloudflare to prevent this. Then I started noticing that they're bypassing cloudflare by connecting directly to the server's ip address and forging the host header. What is the most performant way to return 403 on connections that aren't from the 18 ip addresses used by cloudflare? I tried denying all then explicitly allowing the cloudflare ips but this doesn't work since I've set it up so that CF-Connecting-IP sets the ip allow tests for. I'm using nginx 1.6.0.

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• NFS performance troubleshooting

  - by aix

  I am troubleshooting NFS performance issues on Linux, and I'm looking at the following nfsiostat output: host:/path mounted on /path: op/s rpc bklog 96.75 0.01 read: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 86.561 1408.294 16.269 0 (0.0%) 34.595 89.688 write: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 10.113 326.282 32.265 0 (0.0%) 19.688 72446.246 What exactly is the meaning of avg RTT (ms) and avg exe (ms)? avg exe for writes is 72 seconds(!) -- would you say this is abnormal and, if so, how do I go about troubleshooting this further? I'm using NFS over TCP. Both the client and the server are on the same GigE LAN.

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• Media Temple-like hosting services?

  - by antonpug

  I have a couple of wordpress sites which do not get much traffic now, but I plan on expanding to something like a 1000-2000visits/day in a year or two. Media Temple has some really nice offerings, but their Wordpress plan is 20/month...which is a little too much, seeing as at this point my site is more of a hobby than a money making machine. I currently host with HostGator (just switched from GodaddyiPageBluehost). All these cheaper/pop hosting services are okay, but it would be nice to find something a little bit more "premium", but at a lower cost than MT. Anyone know anything worth looking at?

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• Setting up Ubuntu Server on Amazon EC2 for hosting multiple domains with wildcard subdomains

  - by Ashish Kumar

  I'm trying to set up multiple domains on my Amazon EC2 micro instance running Ubuntu Server 12.04. I installed Apache correctly and set up virtual hosts but having problems with wildcard subdomains. This is what my httpd.conf file looks like NameVirtualHost *:80 <VirtualHost *:80> UseCanonicalName Off VirtualDocumentRoot /home/username/domains/%0/html/ </VirtualHost> My DNS records (on Amazon Route 53) are: domain.tld A 1.2.3.4 *.domain.tld A 1.2.3.4 If i create a test.domain.tld directory with the html subdirectory, it works fine. But what I want to do is to redirect *.domain.tld to domain.tld in case there is no directory for the sub-domain accessed. I would also like www.domain.tld to redirect to domain.tld. The system should also work if I decide to host another website, example.com, on the server. I tried Googling a lot but without any luck. Suggestions?

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• What is a good and safe way of sharing certificates?

  - by Kaustubh P

  I have a few certificates, that are used as authentication, to ssh into my servers on the Amazon cloud. I rotate those certificates weekly, manually. My question is, I need to share the certificates with some colleagues, a few on the LAN, and a few in another part of the country. What is the best practice to share the certificate? My initial thoughts were Dropbox and email. We dont host dedicated email servers with encryption and all, and dont have a VPN. Thanks.

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• IIS 7.5 - Remove the pipe character from usernames for virtual hosts

  - by glasnt

  Currently I have a setup with a virtual FTP site in IIS 7.5 that requires the following authentication details for the anonymous account: Host: ftp.mydomain.com User: ftp.mydomain.com|anonymous Pass: <none> I have multiple FTP accounts setup on this same server. I know that this means I need to specify the domain in the username to let IIS know what I need site to authenticate against, but is it possible to make the username only be anonymous? Would I have to create a user by that name in the windows users and groups area to be and specifically link it there?

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• Multiple User VPN

  - by Aaron

  I am looking for a cheap or free solution to be able to connect multiple people via VPN to a host computer. Each person should not be able to see what the others are doing while logged in. Is this possible and if so where do I start my hunt? Aaron Update: I was not sure what server, was just thinking of doing it on say a win7 desktop. Just looking into having 2-3 users have access to a program without each seeing each other. Basically, I know nothing and want to know if this is a possibility for me. lol

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• Remote servlet by mod_jk ?

  - by marioosh.net

  I have remote servlet for example: h*tps://[ip_address]/servlet (h*tps://[ip_address]/ - Tomcat main page) that i need to configure on local Apache HTTPd server. My mod_jk configuration looks like below, but doesn't work. Something works, because when i type h*tps://localhost/console in a browser i get Tomcat error page "HTTP Status 404 - /console/". JkWorkersFile /etc/apache2/workers.properties JkLogFile /var/log/apache2/mod_jk.log JkLogLevel info JkMount /console/* ajp13 workers.properties: worker.ajp13.type=ajp13 worker.ajp13.host=[ip_address] worker.ajp13.port=8009 Remote Tomcat is configured good i think - listen on port 8009 and servlet h*tps://[ip_address]/servlet works too. <Connector port="8009" protocol="AJP/1.3" redirectPort="443" /> Anybody helps ?

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• Getting Partial / No Redundancy on VM's created on latest datastore

  - by Germano

  Hi, First some background. I'm in the process of upgrading my ESX servers from 3.5 to vSphere 4 and so far I have setup the new vCenter Server. Before I start the upgrade of the ESX, I needed more storage so I created 3 datastores from available space on my Equallogic PS6000 which has been connected for a while so as far as connectivity, nothing has changed. but now here's my problem, I get a "Partial / No Redundancy" on any VM that I create in any of these new datastores. I can create VM's on any of the older datstores on LUN's from exactly the same Equallogic and it works fine, but not the new ones. Keep in mind that these new datastores are the only ones that were created under the new vCenter, so I believe it must have something to do with it. Is anyone aware of any issues about creating datastored using the new vCenter but on a 3.5 ESX host? ISCSI with QLogic QLE406x Thanks in advance for nay help. Germano

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• OSX: DNS records won't change?

  - by Marko

  I've had two sites on my local host and have had mysite1.local and mysite2.local in my /etc/hosts file to pointing in my localhost. Now, I moved those sites into my homeserver (Ubuntu, Local network) and made changes to hosts file + also in /private/etc/hosts is same. 192.168.0.50 mysite1.local 192.168.0.50 mysite2.local I flushed my dnscache sudo dscacheutil -flushcache rebooted machine, reseted safari but still no changes.. Still if I try to go either mysite1.local or mysite2.local it is pointing to localhost?!? What could be the problem?? OS is Snow Leopard 10.6.8

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• Vim Stuck In Insert Mode

  - by Levi Hackwith

  I've been using Vim for several months now via my web host (they allow putty access). All of a sudden, the escape key has become unresponsive. I cannot exist insert or any other mode by simply hitting escape. I have to hit F1 which brings up the help in vim and kicks me into command mode. I'm most certain that my escape key on my keyboard is functioning fine since all of my windows shortcuts that use the escape key operate normally. I know this is a ridiculous question and I'm certain there's a lot more to look into regarding a solution. What I really need is a solid lead as to where to start looking. Things that might help: I'm using vim via putty I'm logging in using jailshell I'm not root

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• Redirect URL using Mac OS X Server Lion

  - by pheedsta

  I have just set up a Mac Mini with OS X Lion Server to host my own website. I have registered multiple domain names, but I would like the user to be automatically redirected to my main domain name if they type in one of the others (i.e. if the user types in www.myotherdomain.com the URL will be forwarded instantly to www.mymaindomain.com). In the Web settings of Server.app, you can easily add additional domains (which works) but it does not change the URL in the browser to www.mymaindomain.com. It keeps www.myotherdomain.com whilst still displaying the correct pages. Does the redirects or alias options do what I want? I can't seem to work out how to use them (there seems to be no documentation that I can find). In Redirects, you need to enter: 'Redirect Type' (Exact Match or Regular Expression) 'Redirect Path' 'Destination URL' 'Redirect Status' (Original was permanently moved, etc) In Alias, you need to enter: 'Alias Type' (Exact Match or Regular Expression) 'Alias Path' 'Destination Folder' Any help would be great.

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• Can't start my Windows XP Virtual Machine: Insufficient Disk Space

  - by Rob

  Okay, I currently have a server with two virtual machines installed on it, a CentOS5.4 and a Windows XP. I was remote desktopping the Windows XP chatting on IRC, and all of a sudden I lost connection. I checked with my HyperVisor and tried to restart it, and it won't start at all. It's giving me this error: Message from server0297.serverpool.gnet.ba: Failed to extend swap file (fileHandle 16414) from 0 KB to 524288 KB: No space left on device. Could not power on VM : No space left on device. Failed to power on VM info 4/17/2010 9:49:20 PM root Basically I bought the set up from a host, he installed the HyperVisor and the VirtualMachines, and honestly I don't really know what I'm doing. I've looked at some of the settings, and I can't figure it out. If you need any additional information, I'll try to provide it. The CentOS5.4 is still starting and working flawlessly, if that's relevant.

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• High CPU usage when running a CentOS guest in VirtualBox

  - by sagi

  I am running CentOS 5.3 as a VirtualBox 3.0.0 guest running on Windows XP. The Windows host CPU usage is constantly at 50% although the CentOS guest is completely idle (i.e. 0.00 load average). I know this is a common problem related to the 1000Hz frequency that the CentOS kernel runs at, and previously a special kernel-vm packages were released to resolve the issue. However, these packages are out of date and the README says that they are not not necessary as of CentOS 5.3. I found out that there is supposedly a kernel parameter divider=10 that reduces the frequency to 100Hz with the standard kernel but it doesn't seem to have any effect when running inside VirtualBox. Is there any way to resolve the issue without resorting to a custom kernel?

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• Simple recursive DNS resolver for debugging (app or VM)

  - by notpeter

  I have an issue which I believe is caused by incorrect DNS queries (doubled subdomains like _record.host.subdomain.tld.subdomain.tld) when querying for SRV records. So I need to an alternate DNS server with heavy logging so I can see every query (especially stupid ones), acting as a recursive resolver with the ability create records which override real DNS records so I can not only find the records it's (wrongly) looking for, but populate those records as well. I know I could install a DNS server on yet another linux box, but I feel like this is the sort of thing that someone may already setup a simple python script or single use vm just for this purpose.

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• Why is my router not routing?

  - by dwj

  Starting a week and half ago my router stopped working with my cable modem. I went to sleep with it working and woke up with it not. I swapped in another router and am still having issues; I was gone for 10 days so now I'm back to trying to figure it out. While I was gone I left everything (cable modem, router, and computer) powered off. My setup: Comcast Ambit cable modem (from Comcast) Netgear WGR614 v4 router -- replaced with Linksys WRT54GS v1.1 Windows XP SP3 other computers, all currently unplugged The modem is using the firmware (ver 2.105.2001) provided by Comcast; hardware version 1.3 The Linksys router is using FW ver 4.71.4 (latest for this release of HW), factory defaults I am only using the wired connections; no wireless. I have swapped out all of the cat5 cable. If I plug my computer directly into the cable modem, I can ping by name or number. Everything works perfectly. If I plug my computer into the router and the router into the modem, I cannot access anything outside of my local network. This is the exact setup I've used for the past 5 years; there were no changes in the past year. Now here's the interesting part: I can log into the Linksys router and get status information from it; everything appears good. Using the Diagnostics, I can run ping and traceroute to any site on the internet. These work perfectly. From my computer, I can ping the router and the modem. However, I cannot ping anything on the internet by with name or number. If I plug in another computer, I can ping it successfully. I've included two transcripts below that show these two attempts. Addresses, DNS, gateways, etc. look good. I cannot access the internet through either router. I am at a loss here. Suggestions? Help! Computer to Router to Cable Modem C:\ipconfig /renew Windows IP Configuration No operation can be performed on Bluetooth Network while it has its media disconnected. Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : hsd1.ca.comcast.net. IP Address. . . . . . . . . . . . : 192.168.1.100 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.1.1 Ethernet adapter Bluetooth Network: Media State . . . . . . . . . . . : Media disconnected C:\ipconfig /all Windows IP Configuration Host Name . . . . . . . . . . . . : wynton Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Unknown IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No DNS Suffix Search List. . . . . . : hsd1.ca.comcast.net. Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : hsd1.ca.comcast.net. Description . . . . . . . . . . . : Intel(R) 82562V-2 10/100 Network Connection Physical Address. . . . . . . . . : 00-1D-09-9B-45-EB Dhcp Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes IP Address. . . . . . . . . . . . : 192.168.1.100 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.1.1 DHCP Server . . . . . . . . . . . : 192.168.1.1 DNS Servers . . . . . . . . . . . : 68.87.76.178 68.87.78.130 Lease Obtained. . . . . . . . . . : Monday, March 22, 2010 10:21:55 PM Lease Expires . . . . . . . . . . : Tuesday, March 23, 2010 10:21:55 PM Ethernet adapter Bluetooth Network: Media State . . . . . . . . . . . : Media disconnected Description . . . . . . . . . . . : Bluetooth LAN Access Server Driver Physical Address. . . . . . . . . : 00-0A-3A-6F-68-41 C:\ping google.com Ping request could not find host google.com. Please check the name and try again . C:\ping 74.125.19.104 Pinging 74.125.19.104 with 32 bytes of data: Request timed out. Request timed out. Request timed out. Request timed out. Ping statistics for 74.125.19.104: Packets: Sent = 4, Received = 0, Lost = 4 (100% loss), C:\ Computer to Cable Modem Directly C:\ipconfig /renew Windows IP Configuration No operation can be performed on Bluetooth Network while it has its media disconnected. Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : hsd1.ca.comcast.net. IP Address. . . . . . . . . . . . : 71.204.149.195 Subnet Mask . . . . . . . . . . . : 255.255.252.0 Default Gateway . . . . . . . . . : 71.204.148.1 Ethernet adapter Bluetooth Network: Media State . . . . . . . . . . . : Media disconnected C:\ipconfig /all Windows IP Configuration Host Name . . . . . . . . . . . . : wynton Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Unknown IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No DNS Suffix Search List. . . . . . : hsd1.ca.comcast.net. Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : hsd1.ca.comcast.net. Description . . . . . . . . . . . : Intel(R) 82562V-2 10/100 Network Connection Physical Address. . . . . . . . . : 00-1D-09-9B-45-EB Dhcp Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes IP Address. . . . . . . . . . . . : 71.204.149.195 Subnet Mask . . . . . . . . . . . : 255.255.252.0 Default Gateway . . . . . . . . . : 71.204.148.1 DHCP Server . . . . . . . . . . . : 68.87.76.10 DNS Servers . . . . . . . . . . . : 68.87.76.178 68.87.78.130 Lease Obtained. . . . . . . . . . : Monday, March 22, 2010 10:18:50 PM Lease Expires . . . . . . . . . . : Monday, March 22, 2010 11:12:31 PM Ethernet adapter Bluetooth Network: Media State . . . . . . . . . . . : Media disconnected Description . . . . . . . . . . . : Bluetooth LAN Access Server Driver Physical Address. . . . . . . . . : 00-0A-3A-6F-68-41 C:\ping google.com Pinging google.com [74.125.19.99] with 32 bytes of data: Reply from 74.125.19.99: bytes=32 time=20ms TTL=55 Reply from 74.125.19.99: bytes=32 time=17ms TTL=55 Reply from 74.125.19.99: bytes=32 time=28ms TTL=55 Reply from 74.125.19.99: bytes=32 time=18ms TTL=55 Ping statistics for 74.125.19.99: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 17ms, Maximum = 28ms, Average = 20ms C:\ping 74.125.19.104 Pinging 74.125.19.104 with 32 bytes of data: Reply from 74.125.19.104: bytes=32 time=18ms TTL=55 Reply from 74.125.19.104: bytes=32 time=18ms TTL=55 Reply from 74.125.19.104: bytes=32 time=17ms TTL=55 Reply from 74.125.19.104: bytes=32 time=16ms TTL=55 Ping statistics for 74.125.19.104: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 16ms, Maximum = 18ms, Average = 17ms C:\

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• an unknown ip on network

  - by Ahmed safan

  In our office we have many PCs, all of them have static IP addresses. We had a problem with one server with ip 192.168.1.10 dropping off the network occasionally. I unplugged the network cable from the server and from pinged 192.168.1.10 from another host and there was a response. I searched all PCs to see if any has such ip but i didn't found a one. I changed the server ip to fix the problem, but I still find this rogue device using 192.168.1.10 on the network -- how can I figure out what it is? Could it be the ip of virtual machine on someone's PC?

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• unable to connect gmail and hotmail via telnet

  - by codeomnitrix

  Hey all i am try to connect to gmail and hotmail server via telnet. As: $: telnet smtp.gmail.com 25 Trying 74.125.127.109... Connected to gmail-smtp-msa.l.google.com. Escape character is '^]'. 220 mx.google.com ESMTP j3sm3044317ybe.11 helo 250 mx.google.com at your service 220 2.0.0 Ready to start TLS mail from: [email protected] Connection closed by foreign host. Here codeomnitrix is a user of smtp.localhost.com. And i am running postfix at my system with sitename being smtp.localhost.com. And i am able to sent mail locally from one user to another user but can't send to any other user who is not local. Thanks in advance:)

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• RHEL 5/CentOS 5 - sshd becomes unresponsive

  - by ewwhite

  I have a number of CentOS 5.x and RHEL 5.x systems whose SSH daemons become unresponsive, preventing remote logins. The typical error from the connecting side is: $ ssh db1 db1 : ssh_exchange_identification: Connection closed by remote host Examining /var/log/messages after a forced reboot shows the following leading up to the restart: Dec 10 10:45:51 db1 sshd[14593]: fatal: Privilege separation user sshd does not exist Dec 10 10:46:02 db1 sshd[14595]: fatal: Privilege separation user sshd does not exist Dec 10 10:46:54 db1 sshd[14711]: fatal: Privilege separation user sshd does not exist Dec 10 10:47:38 db1 sshd[14730]: fatal: Privilege separation user sshd does not exist These systems use LDAP authentication and the nsswitch.conf file is configured to look at local "files" first. [root@db1 ~]# cat /etc/nsswitch.conf # # /etc/nsswitch.conf # passwd: files ldap shadow: files ldap group: files ldap hosts: files dns The Privilege-separated SSH user exists in the local password file. [root@db1 ~]# grep ssh /etc/passwd sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin Any ideas on what the root cause is? I did not see any Red Hat errata that covers this.

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• MSSQL 2005 migration to 2008 Express Edition - Any complications?

  - by FullTrust

  Hey, I've developed an application that uses ASP.NET, Linq-to-SQL and MSSQL 2005. However, I would like to migrate it to MSSQL 2008. I don't have MSSQL 2008, so I was wondering if it's possible for me to detach my 2005 db and attach it within 2008 express edition, to test if it will work on my host's MSSQL 2008 server? I haven't done anything complicated (CRUD is done from Linq to SQL, and all stored procs are the ASP.NET Membership default ones). Would this work, or will I get an error since I'm 'downgrading' so to speak? If I download MSSQL 2008 express edition, it will be on the same system as my MSSQL 2005 Developer Edition. I'm hoping this won't cause any problems? Thanks

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• Multiple urls to 1 website with a wild card ssl.

  - by dagda1

  Hi, At the moment, we have 27 single sites in IIS6, all with their own urls, all with the same subdomain, e.g. https://company1.mycompany.com https://company2.mycompany.com etc., etc. To further complicate things, there is 1 wild card certificate which deals with the subdomain *.mycompany.com and is assigned to each website. All these websites run under the same codebase. We want to consolidate all these websites into 1 website. Are there any issues with having a large number of host headers running under 1 IIS6 site or is there a better way of configuring the site? Thanks Paul

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