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  • Erratic DNS name resolution

    - by alex
    Hi all, We have a client we host a web for (blog.foobar.es). We do not manage foobar.es's DNS setup, we just told them to point blog.foobar.es to our web server's IP. We have noticed that sometimes we cannot browse to blog.foobar.es, but we can browse to other sites on that server. Troubleshooting a bit using host(1) yields something funny: $ host blog.foobar.es 8.8.8.8 Using domain server: Name: 8.8.8.8 Address: 8.8.8.8#53 Aliases: Host blog.foobar.es not found: 3(NXDOMAIN) , being 8.8.8.8 one of Google's public DNS servers. However, sometimes the same server resolves the name correctly (!). Another funny thing, is that our ISP's DNS servers sometimes say: $ host blog.foobar.es 80.58.61.250 Using domain server: Name: 80.58.61.250 Address: 80.58.61.250#53 Aliases: blog.foobar.es has address x.x.x.x Host blog.foobar.es not found: 3(NXDOMAIN) Which I don't really understand. I've dug around using dig(1), and have noticed they've set up a SOA record for foobar.es: $ dig foobar.es ; <<>> DiG 9.7.0-P1 <<>> foobar.es ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59824 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 ;; QUESTION SECTION: ;foobar.es. IN A ;; AUTHORITY SECTION: foobar.es. 86400 IN SOA dns1.provider.es. root.dns1.provider.es. 2011030301 86400 7200 2592000 172800 ;; Query time: 78 msec ;; SERVER: 80.58.61.250#53(80.58.61.250) ;; WHEN: Thu Mar 3 16:16:19 2011 ;; MSG SIZE rcvd: 78 ... which I'm completely unfamiliar with. Ideas? We can't really do much as we do not control DNS, but we'd like to point our clients in the right direction...

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  • Mac updated just now, postgres now broken

    - by Dave
    I run postgres 9.1 / ruby 1.9.2 / rails 3.1.0 on a maxbook air for local dev. It's all been running smoothly for months, (though this is the first time I've done development on a mac.) It's a macbook air from last year, and today I got the mac osx software update message as I have a few times before, and my system downloaded approx 450mb of updates and restarted. It now says it's on OSX 10.7.3. Point is, postgres has stopped working, when I start my thin server (mirror heroku cedar) as normal, and then browse to my rails app I get: PG::Error could not connect to server: Permission denied Is the server running locally and accepting connections on Unix domain socket "/var/pgsql_socket/.s.PGSQL.5432"? What happened? After browsing around a few questions I'm still confused, but here's some extra info: Running psql from command line gives same error I can run pgadmin 3 and connect via it and run SQL no problems Running which psql shows the version as /usr/bin/psql I created a PostgreSQL user back when I got the mac (it's always been on lion) I've no idea why, almost certainly I was following a tutorial which I neglected to store in my notes. Point is I am aware there is a _postgres user as well. I know it's rubbish, but apart from a note on passwords, I don't have any extra info on how I configured postgres - though the obvious implication is that I did not use the _postgres user. Anyone have suggestions or information on what might have changed / what I can try to debug and fix? Thanks. Edit: Playing around based on this question and answer: http://stackoverflow.com/questions/7975414/check-status-of-postgresql-server-mac-os-x, see this string of commands: $ sudo su postgreSQL bash-3.2$ /Library/PostgreSQL/9.1/bin/pg_ctl start -D /Library/PostgreSQL/9.1/data pg_ctl: another server might be running; trying to start server anyway server starting bash-3.2$ 2012-04-08 19:03:39 GMT FATAL: lock file "postmaster.pid" already exists 2012-04-08 19:03:39 GMT HINT: Is another postmaster (PID 68) running in data directory "/Library/PostgreSQL/9.1/data"? bash-3.2$ exit

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  • Strange traceroute to msdn.microsoft.com

    - by Jasper
    The problem is I could not view any msdn.microsoft.com/* site and the main site itself on my Ubuntu box on Google Chrome browser. Error is: Error 101 (net::ERR_CONNECTION_RESET): The connection was reset. When I run traceout I get different result: Here is simple one: traceroute msdn.microsoft.com traceroute to msdn.microsoft.com (65.55.11.235), 30 hops max, 60 byte packets 1 10.0.0.138 (10.0.0.138) 0.121 ms 0.131 ms 0.128 ms 2 192.168.0.1 (192.168.0.1) 1.730 ms 1.724 ms 2.024 ms 3 bzq-179-37-1.static.bezeqint.net (212.179.37.1) 18.314 ms 19.277 ms 20.694 ms 4 bzq-218-227-250.red.bezeqint.net (81.218.227.250) 22.806 ms 23.651 ms 24.820 ms 5 bzq-179-75-198.static.bezeqint.net (212.179.75.198) 26.650 ms 27.533 ms 28.791 ms 6 * * * 7 bzq-179-124-122.static.bezeqint.net (212.179.124.122) 76.032 ms 72.968 ms 74.660 ms 8 igblmdistc7504.uk.msft.net (195.66.224.140) 75.708 ms 76.797 ms 78.257 ms 9 ge-5-1-0-0.lts-64cb-1a.ntwk.msn.net (207.46.42.227) 80.125 ms 81.336 ms 82.671 ms 10 ge-7-0-0-0.nyc-64cb-1a.ntwk.msn.net (207.46.47.20) 179.232 ms so-7-1-0-0.ash-64cb-1b.ntwk.msn.net (213.199.144.158) 162.508 ms 163.223 ms 11 xe-0-0-1-0.co1-96c-1b.ntwk.msn.net (207.46.45.29) 227.964 ms ge-7-0-0-0.co1-64c-1b.ntwk.msn.net (207.46.40.90) 228.226 ms xe-0-0-1-0.co1-96c-1b.ntwk.msn.net (207.46.45.29) 212.781 ms 12 10.22.8.54 (10.22.8.54) 215.046 ms xe-5-2-0-0.co1-96c-1a.ntwk.msn.net (207.46.40.167) 214.825 ms 10.22.8.58 (10.22.8.58) 213.251 ms 13 10.22.8.62 (10.22.8.62) 212.745 ms 213.827 ms 10.22.8.50 (10.22.8.50) 215.655 ms 14 10.22.8.62 (10.22.8.62) 211.665 ms !X 10.22.8.50 (10.22.8.50) 214.491 ms !X 10.22.8.54 (10.22.8.54) 218.471 ms !X Line 1,2 : It's me Line from 3-7: It's my Internet provider Line 8 and on: I think I hit MS servers WTF line 12-14 ????? 10.22.8.x ???? then I run this traceroute: sudo traceroute -T msdn.microsoft.com traceroute to msdn.microsoft.com (65.55.11.235), 30 hops max, 60 byte packets 1 10.0.0.138 (10.0.0.138) 0.109 ms 0.127 ms * 2 * * * 3 * * * 4 * * * 5 * * * 6 * 65.55.11.235 (65.55.11.235) 16.019 ms 17.364 ms So I hit MSDN web site already at 6 hop ! WTF ??? This is host -a msdn.microsoft.com from me: host -a msdn.microsoft.com Trying "msdn.microsoft.com" ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 19522 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;msdn.microsoft.com. IN ANY ;; ANSWER SECTION: msdn.microsoft.com. 3274 IN CNAME msdn.microsoft.akadns.net. msdn.microsoft.akadns.net. 600 IN A 65.55.11.235 Received 91 bytes from 127.0.0.1#53 in 108 ms Could someone help me understand and fix it ??

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  • Scanstate.exe Migration Error

    - by user1438147
    I'm trying to create a migration store on a server using Scanstate and this is the error I recieve: C:\USMTscanstate.exe \(Server_Name)\migration\mystore /f:migdocs.xml /f: migapp.xml /v:13 /f:scan.log Failed. An error occurred processing the command line. scanstate.exe \svdataitfl1\migration\mystore ##ERROR## -- /f:migdocs.xml /f migapp.xml /v:13 /f:scan.log Undefined or incomplete command line option ScanState return code: 11 I can't seem to find the answer to this...need some help.

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  • How to move Mdadm RAID drive (EBS based) to different AWS Instance

    - by Stanley
    We have a media-rich web application that is hosted on AWS. We have several Web Servers and we have an NFS server. On the NFS server (Linux server) we have several EBS volumes that are mounted and we've used mdadm to implement the different mounted volumes as a single RAID volume. The Web Servers simply access the NFS storage through a mount point. Amazon has now let us know that they will be performing power maintenance on this server in a couple of days time. Since all our media is on here it would render our site unusable for the hours while Amazon is working on it. We want to try and prevent this downtime. I was thinking that we can prevent server downtime by perhaps setting up a new server temporarily and attaching the EBS drives (raid volume) to that server and have our web servers point there during maintenance. This is a very high risk operation since this involves several terabytes of our production data. What would be the safe way to move over our logical raid drive (md0) to a new amazon instance? I was hoping that I could start with building the new server, mounting the ebs volumes and assembling the RAID partition using mdadm --assemble --scan before unmounting from the existing instance so that I can first test that everything works and thus having it mounted on two instances at the same time, but I don't believe that is possible with the way that filesystems work. How do I move a Linux software RAID to a new machine? suggests a way to move drives, but isn't really a cloud-based question. Perhaps there are simpler ways to prevent system downtime with our solution being hosted on the cloud? I have considered taking an EBS snapshot, but that tries to replicate all the many terabytes of mounted storage, so this is not a practical solution. Any ideas?

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  • No Telnet login prompt when used over SSH tunnel

    - by SCO
    Hi there ! I have a device, let's call it d1, runnning a lightweight Linux. This device is NATed by my internet box/router, hence not reachable from the Internet. That device runs a telnet daemon on it, and only has root as user (no pwd). Its ip address is 192.168.0.126 on the private network. From the private network (let's say 192.168.0.x), I can do: telnet 192.168.0.126 Where 192.168.0.126 is the IP address in the private network. This works correctly. However, to allow administration, I'd need to access that device from outside of that private network. Hence, I created an SSH tunnel like this on d1 : ssh -R 4455:localhost:23 ussh@s1 s1 is a server somewhere in the private network (but this is for testing purposes only, it will endup somewhere in the Internet), running a standard Linux distro and on which I created a user called 'ussh'. s1 IP address is 192.168.0.48. When I 'telnet' with the following, let's say from c1, 192.168.0.19 : telnet -l root s1 4455 I get : Trying 192.168.0.48... Connected to 192.168.0.48. Escape character is '^]'. Connection closed by foreign host . The connection is closed after roughly 30 seconds, and I didn't log. I tried without the -l switch, without any success. I tried to 'telnet' with IP addresses instead of names to avoid reverse DNS issues (although I added to d1 /etc/hosts a line refering to s1 IP/name, just in case), no success. I tried on another port than 4455, no success. I gathered Wireshark logs from s1. I can see : s1 sends SSH data to c1, c1 ACK s1 performs an AAAA DNS request for c1, gets only the Authoritave nameservers. s1 performs an A DNS request, then gets c1's IP address s1 sends a SYN packet to c1, c1 replies with a RST/ACK s1 sends a SYN to c1, C1 RST/ACK (?) After 0.8 seconds, c1 sends a SYN to s1, s1 SYN/ACK and then c1 ACK s1 sends SSH content to d1, d1 sends an ACK back to s1 s1 retries AAAA and A DNS requests After 5 seconds, s1 retries a SYN to c1, once again it is RST/ACKed by c1. This is repeated 3 more times. The last five packets : d1 sends SSH content to s1, s1 sends ACK and FIN/ACK to c1, c1 replies with FIN/ACK, s1 sends ACK to c1. The connection seems to be closed by the telnet daemon after 22 seconds. AFAIK, there is no way to decode the SSH stream, so I'm really stuck here ... Any ideas ? Thank you !

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  • server 2008 r2 - wbadmin systemstatebackup - system writer not found in the backup

    - by TWood
    I am trying to manually run a systemstatebackup command on my server 2008 r2 box and I am getting an error code '2155347997' when I view the backup event log details. The command line tells me that I have log files written to the c:\windows\logs\windowsserverbackup\ path but I have no files of the .log type there. My command window tells me "System Writer is not found in the backup". However when I run vssadmin list writers I find System Writer in the list and it shows normal status with no last errors stored. I am running this from an elevated command prompt as well as from a logged on administrator account. My backup target path has permission for network service to have full control and it has plenty of free space. Looking in eventlog I have two VSS error 8194 that happen immediately before the Backup error 517 which has the errorcode 2155347997 listed. All three of these errors are a result of trying to run the command for the systemstatebackup. It's my belief that some VSS related permission is failing and exiting the backup process before it ever gets started. Because of this the initial code that creates the log files must not be running and this is why I have no files. When running the systemstatebackup command from the command prompt and watching the windowsserverbackup directory I do see that I have a Wbadmin.0.etl file which gets created but it is deleted when the backup errors out and stops. I have looked online and there are numerous opinions as to the cause of this error. These are the things I have corrected to try and fix this issue before posting here: Machine runs a HP 1410i smart array controller but at one time also used a LSI scsi card. Used networkadminkb.com's kb# a467 to find one LSI_SCSI entry in HKLMSysCurrentControlSetServices which start was set to 0x0 and I modified to 0x3. No changes. In HKLMSystemCurrentControlSetServicesVSSDiag I gave network service full control where it previously only had "Special Permission". No changes. I followed KB2009272 to manually try to fix system writer. These are all of the things I have tried. What else should I look at to resolve this issue? It may be important to note that I run Mozy Pro on this server and that was known in the past to use VSS for copying operations and it occasionally threw an error. However since an update last year those error event log entries have stopped.

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  • What are the default groups assigned to the first user in Ubuntu Server?

    - by Wayne Koorts
    I just made a silly mistake on my Ubuntu Server box: I added myself to a group using usermod -G, after which I discovered the -a option... The result is that I am now out of the admin group, and lost my sudo rights. I can sort that out, but I want to know what other groups I may been removed from? My user was the first one so what I'm looking for is a list of groups that the first user gets added to at installation time.

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  • How did you find your current job?

    - by sanksjaya
    I'm a student looking for a job as a Jr. Sys Admin / Information Security position. The moment I click search from simplyhired.com or dice.com my job gets complicated. It's so hard to spot the ones that you definitely want to apply for. So, just share your story of how you spot your current job online? What factors did you consider before applying? And any tips for young job seekers. Thanks :)

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  • OpenVPN IPV6 Tunnel Radvd

    - by Arenstar
    Hello.. I have an interesting question regarding ipv6 + openvpn.. My Version is OpenVPN 2.1.1 i have been given a native /64 ipv6 network ( for this example 2001:acb:132:acb::/64 ) The plan was/is, route this block through openvpn and into an office ( for testing purposes ) Soo to explain.. I have a Centos Box as the first linux "router" in a datacenter & a Ubuntu box as the second linux "router" in the office I have created a simple point-to-point tunnel using tun ( based off ipv4 address to start the tunnel ) I have assigned to Centos /sbin/ip addr add fed1::1/128 dev eth0 /sbin/ip addr add fed2::2/128 dev tun0 /sbin/ip route add 2001:acb:132:acb::/64 dev tun0 ## ipv6 Block down the tunnel /sbin/ip route add ::/0 dev eth0 ## Default out to Gateway I have assigned to Ubuntu /sbin/ip addr add fed1::3/128 dev tun0 /sbin/ip addr add fed1::4/128 dev eth0 /sbin/ip route add 2001:acb:132:acb::/64 dev eth0 ## ipv6 Block down to eth0 /sbin/ip route add ::/0 dev tun0 ## Default up the tunnel I have also included on both servers.. sysctl -w net.inet6.ip6.forwarding=1 Looks Good... right??? Wrong.. :( I am not able to ping fed1::1 from fed1::4 (Ubuntu) (can ping :4,:3,:2) However, i can ping fed1::1 fed1::2 from :3 ?????? ( very strange ) I am able to access the internet from any ipv6 interface on the Centos Box but clearly not from the Ubuntu box.. Further, i will eventually run radvd on the Ubuntu box eth0, and autoconf the network with ipv6 address's Anyone with some advice / tips to help me out.. ??? Cheers

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  • Can't pin modified shortcuts to the Windows 7 task bar

    - by Coder
    I have a shortcut to a .bat file which I pin to the task bar using a workaround by using another icon and this seems to work. Now I make a copy of that shortcut, point it to a different .bat file, rename it, and I can't pin this one to the task bar. I have to find some other new unused icon to pin, pin it, then modify it manually. The other problem this causes is that windows seems to track which icons were pinned even if they are modified after the fact. As such, if I use media player as my dummy icon, pin it, then alter it's name and shortcut to point to a .bat file, I can't re-pin windows media player and if I select unpin from the windows media player, it unpins my shortcut to my .bat file. I can't believe how ridiculous this is. Is there a way to pin anything I want to the taskbar (ie. .bat file in my case) that does not cause problems like this? Is there an easy way I can copy an existing shortcut and modify it and re-pin it to the taskbar? The reason I want to copy it is because I start a .bat file (in particular git bash) and I set properties on the window like quick edit, increase the screen buffer and set it's position and size manually. I don't want to have to do this to every single icon I want to pin since they will be identical aside from the shortcut url.

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  • Give the path to the inserted USB key to a script

    - by Xavier Nodet
    I'd like to run a given Perl script whenever I connect my camera to my PC, so that this script will download all the photos on it. But as the drive letter for the camera may change depending on what's already connected, I need to pass this drive letter as an argument to the script. Is this doable? Thanks. PS: if this is not possible, an answer to this other question would be very helpful.

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  • measuring of network reliability

    - by xpugur
    Hi, i have a exam to do at home but there is a question that i can't solve :S ... can anybody help me about that question (( i google it with diffrent ways but can't found anything as answer)) question: how the network reliability can be measured(write at least 4 factors)? explain 3 of the factors in details with their advantages and disadvantages?

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  • How to get email notification when process on ubuntu screen stopped?

    - by Manoj2411
    I have a application running on Ubuntu 12.04.2 LTS and I am running an application server like mailman server or faye server on ubuntu screen. The problem is, at times the process that is running on screen gets stopped and my application crashes because of that. Now I want to be notified whenever that 'faye server' or 'mailman server' is stopped that is running on screen. I am using Digital Ocean and I have already setup postfix server.

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  • How do I reset an USB device without unplugging it in Linux?

    - by Grumbel
    Every now and then there might come a need to reset a USB device, is there a way to perform the reset in software without unplugging the device itself and the pluggin it back in? More specifically I have a webcam which gets confused when playing to much with the settings in guvcapture and then needs a reset to get back on track.

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  • GIMP: Slightly wrong color when saving images

    - by chris_l
    When I create a new image, fill it with a single color, and save it as *.png or *.jpeg, it gets a slightly wrong color. When I save it as *.gif, the color is correct. Does this have something to do with a color profile? How can I turn it off? (Gimp 2.6.7 on Mac) BTW, when I use "Digital Color Meter" to check the color in the GIMP window, I also get a wrong value - but that value is again a little bit different.

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  • What are the strengths of OpenSolaris compared to Linux?

    - by netvope
    Please try to answer in these areas: For what kind of usage is OpenSolaris more suited than Linux? What are the useful OpenSolaris features that Linux lacks? Personal experiences are welcomed, but please don't start a flame war. Strengths of Linux over OpenSolaris are beyond this topic. (For Linux, I'm thinking of something like Ubuntu or Fedora, but not RHEL, if that matters.) (I have used Linux servers for a long time but have never used Solaris, if that matters.)

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  • How do I ensure a process is running, even if it kills itself? (it needs to be restarted then)

    - by le_me
    I'm using linux. I want a process (an irc bot) to run every time I start the computer. But I've got a problem: The network is bad and it disconnects often, so I need to manually restart the bot a few times a day. How do I automate that? Additional information: The bot creates a pid file, called bot.pid The bot reconnects itself, but only a few times. The network is too bad, so the bot kills itself sometimes because it gets no response. What I do currently (aka my approach ;) ) I have a cron job executing startbot.rb every 5 minutes. (The script itself is in the same directory as the bot) The script: #!/usr/bin/ruby require 'fileutils' if File.exists?(File.expand_path('tmp/bot.pid')) @pid = File.read(File.expand_path('tmp/bot.pid')).chomp!.to_i begin raise "ouch" if Process.kill(0, @pid) != 1 rescue puts "Removing abandoned pid file" FileUtils.rm(File.expand_path('tmp/bot.pid')) puts "Starting the bot!" Kernel.exec(File.expand_path('./bot.rb')) else puts "Bot up and running!" end else puts "Starting the bot!" Kernel.exec(File.expand_path('./bot.rb')) end What this does: It checks if the pid file exists, if that's true it checks if kill -s 0 BOT_PID == 1 (if the bot's running) and starts the bot if one of the two checks fail/are not true. My approach seems to be quite dirty so how do I do it better?

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  • Can't Mount Databases in the Recovery Storage Group in Exchange 2003

    - by Kyle Brandt
    After restoring some mail stores, mounting them in the recovery storage group errors out. So far a repair with eseutil (which the log says was successful) and a server reboot has been tried. A defrag is currently running on the mail store I need to go through this again to post the exact error codes, so I will be updating this question. But I thought someone who does this a lot might have a "More times than not..." answer in the meantime.

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  • How do you clean your laptop?

    - by penyaskito
    I work in the countryside gathering requirements, so my laptop often gets a lot of dust, and I cannot dedicate too much time for cleaning it, nor opening it. I'd like to hear what solutions do you use for cleaning it, specially the screen and keyboard. I prefer home-made solution before special products, that I cannot buy at work. Thanks in advance.

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  • Looking for a NTP Server Software for Windows

    - by Simon
    I'm looking for a, preferably free, NTP Server for Windows Server 2003/2008. We have already tried the built in Windows Time Server, but our tests did show that it is not very accurate, we see time differences up to 500ms. The max time difference we can allow for our application is ~100ms. Now we have already used the Meinberg NTPd for Windows. It works great except we have one big issue with it: If there is a network connection problem between the client and server, the ntp server is in a panic state It won't give the client a new time until we restart the ntp service. This is a big issue which has caused us some trouble. It was working fine for months until there was a network problem we didn't notice, we only noticed it after a week when the time difference was already 30 sec. on the clients. So please suggest some alternative NTP Server for windows. I did Google but I get a lot of unrelated search results. Edit: So far the ntpd windows version was very accurate and I'd like to stick with it. The only problem is the "panic state" after a network disconnect. Maybe some knows here what the cause of this is and how to fix it. Also, I forgot to mention that we have a server/client setup like this: Server1 -- Server2 -- Server3 -- Client1 -- Client2 -- Client3 So Server2 gets its time from Server1, Server3 gets its time from Server2, and the Clients get their time from Server3. Also, there are clients connected directly to Server2. It is important that all Servers and Clients have the exact same time (within ~100ms) Now there was a network problem with Server3 and its clients. The servers run the ntpd port for Windows, which acts as NTP server and client. The clients have Dimension4 as NTP client. After the network problem, the error message in D4 was something like this (out the top of my head, don't have the exact error message): Server response: The server is in a panic state (could not sync clock) I read through the ntpd docs, and the only mention of "panic" is when the time difference is 10000 seconds which will cause to exit the ntpd server but this was not the case. Also there is a "-g" command line switch to disable the panic exit, but it is already set by default. Any ideas what could cause the panic state and how to get rid of it next time?

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  • my laptop wireless registers as 169.254.111.111

    - by Roalt
    I sometimes gets an ip address of 169.254.111.111 received for my laptop (instead of one in the 10.0.0.x range). I thought it was a problem with my Ubuntu system, but after I dual-booted I got the same problem under Windows Vista with the same laptop. What's the problem, why does it happens only sometimes, and how can it be solved? For the record: I'm using a Linksys WRT610N wireless router.

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