Intermitent Loss of Network Connectivity

Lately, some users in our network (a gigabit switched network) have been experiencing intermitent loss of connectivity to their network servers/resources. The message reads: "The connection to the remote computer was broken. This may have been caused by a network error...."
A review of the core switches'logs revealed nothing out of the ordinary and CiscoWorks logged nothing. Does anybody know what else I might be missing here in trying to troubleshoot this problem??

Mparek is on the right track here, check the logs on the server that you are getting the error connecting to. It MIGHT be the network, but often it is the server, either being too busy to respond, or having a malfunction of some type. If it's on a broad range of servers, check the switch closest to that block, but check the pc's first.

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    19/08/13 12:07:58.000 PM kernel[0]: vmnet:           Port 6
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    19/08/13 12:07:58.396 PM mDNSResponder[100]: mDNSPlatformSendUDP: sendto(9) failed to send packet on InterfaceID 0000000000000001   lo0/6 to FF02:0000:0000:0000:0000:0000:0000:00FB:5353 skt 9 error -1 errno 55 (No buffer space available) 6348501084 MessageCount is 500
    19/08/13 12:07:58.396 PM mDNSResponder[100]: mDNSPlatformSendUDP: sendto(9) failed to send packet on InterfaceID 0000000000000001   lo0/6 to FF02:0000:0000:0000:0000:0000:0000:00FB:5353 skt 9 error -1 errno 55 (No buffer space available) 6348501084 MessageCount is 600
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    19/08/13 12:07:58.000 PM kernel[0]: ip4_output (ipsec): error code 22
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    19/08/13 12:07:59.000 PM kernel[0]: ip4_output (ipsec): error code 22
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    19/08/13 12:07:59.705 PM racoon[265]: IKEv1 Information-Notice: transmit success. (Delete IPSEC-SA).
    19/08/13 12:07:59.705 PM racoon[265]: IKE Packet: transmit success. (Information message).
    19/08/13 12:07:59.706 PM racoon[265]: IKEv1 Information-Notice: transmit success. (Delete ISAKMP-SA).
    19/08/13 12:07:59.706 PM racoon[265]: Connecting.
    19/08/13 12:07:59.706 PM racoon[265]: IPSec Phase1 started (Initiated by me).
    19/08/13 12:07:59.706 PM racoon[265]: IKE Packet: transmit success. (Initiator, Main-Mode message 1).
    19/08/13 12:08:00.000 PM kernel[0]: ip4_output (ipsec): error code 22
    19/08/13 12:08:00.000 PM kernel[0]: vmnet: VMNetSetopt: Set link state DOWN
    19/08/13 12:08:00.000 PM kernel[0]: vmnet: VMNetSetopt: Set link state UP
    19/08/13 12:08:02.114 PM racoon[265]: IKE Packet: transmit success. (Phase1 Retransmit).
    19/08/13 12:08:02.252 PM digest-service[76044]: label: default
    19/08/13 12:08:02.252 PM digest-service[76044]:           dbname: od:/Local/Default

    If you're not current on your VMware software, patch that to current.
    Please then consider asking the VMware folks directly.  They'll be looking for details such as your version and the guest operating system.  Also probably for the network configuration within the virtual machine; the details of the virtual network set-up.
    In general, there's not a whole lot of VMware discussion traffic here in the OS X Server forum.  There's also little or nothing on that stack that looks specific to OS X Server in that log.  That is mostly VMware chatter, with some generic OS X networking for mDNS (Bonjour) traffic. 
    Put another way, this forum probably isn't the best spot to get an answer.  The folks in a VMware forum will likely have a rather better idea of what those log messages really mean, and may well have seen this sequence before.

  • Error: Network Connection Timed Out

    I am beyond ****** off at the moment. My iTunes was working perfectly until two weeks ago, and now it insists my Network Connection Timed Out when I try to access the store or update podcasts.
    It can't be my internet connection, because as you can see, I'm able to access the internet. For some reason it's this specific copy of iTunes (7.5), because the iT7 downstairs works perfectly. Of course, since Apple are so fecking stingy, I can't add a few files from there without wiping everything off my iPod.
    So here's the run-down:
    I'm using a Dell Inspiron 8600, Windows XP, browsing with Firefox and attempting to load the latest podcasts onto my iPod Shuffle. I don't give a toss about downloading songs, I just want to update my podcasts without having to search the net for the source file.
    I ran the Network Diagnostics and it insists the Conneciton to iTunes failed, suggesting I adjust my cable (i don't have one - it's wireless) or flush my dns settings (which i've done several times).
    I found a thread on these forums from March and tried every solution:
    - uninstalling and reinstalling itunes... doesn't work.
    - opening Internet Explorer 7, then opening iTunes... doesn't work.
    - searching for a host file and removing the phobos apple line... doesn't work. The phobos line wasn't there
    - using itunes 7... doesn't work.
    - flushing my dns... doesn't work.
    - turning off my firewall.... doesn't work.
    - avoiding clashes with mcafee or zone alarm... doesn't work, cos i don't use those
    I think it's appalling that I've tried all this, and i'm still no closer to knowing what the problem is, and that Apple failed to respond to any of the other people's problems in the earlier thread. And that i spent about ten minutes signing up to this fecking forum just to ask for help. Surely support should be readily available to anyone!
    Can anybody help me? In the other thread, people found alternative sites for buying music, but has anyone got an alternative, ipod-compatible podcasting program?

    I have this same problem. Here's what I can add to this discussion - iTunes accessed the iTunes store a day or two ago. I have a home network and can access the internet from all of the networked PCs. I can access the iTunes store from all of the networked PCs using Internet Explorer. I can access the iTunes store from my laptop iTunes. I can not access the iTunes store from my workstation PC. I get the same "network connection timed out" message. I downloaded and installed a new (same version) of iTunes on the workstation PC. both the laptop and the workstation are running the same OS (Windows XP SP2), both are Dell computers, both are accessing the internet via a wired connection to the same switch and the same router. All other internet connections work fine.
    What's different? In the last couple of days my Workstation lost access to a network printer. I worked with HP for over an hour to re-establish network connection to that printer with no success. I have access to the same networked printer from my laptop.
    The IP address for the network printer is identical to what it was when it was installed - HP suggests looking for a change to the IP address. I made no changes to the workstation PC, the home network or the router, ISP, or internet connection.
    But, it seems to me that the loss of access to the HP networked printer and the inability of iTunes to access the iTunes store are related.
    I also called Apple and attempted to get technical support. I own 4 iPods with 104 Gbs of storage on them, I own 1900 CDs and iTunes has 36.5 days of music loaded into it.
    I purchased Apple Care on all of the iPods - it's expired and they never warned me. They want to charge me $29 to fix this problem - even though I no longer can purchase music via the iTunes Store, so I need to pay $29 in order to gain access to the iTunes store to spend more money with Apple?! Not a smart business decision. I own a few other PC based music programs and more than willing to transfer all of it out of iTunes and into one of the other products. I'll sell all the iPods on eBay and purchase other MP3 players if I must.
    But, I suspect the problem is (1) Apple doesn't have a documented answer to this problem, (2) the level 1 techs that answer the support phone are clueless - they just e-mailed me the same article from the Apple website that I told them I read and does not apply to my problem, and obviously does not resolve my problem. (3) Apple is not setup to resolve this type of problem with their level 1 support, and they can't escalate the problem without charging us.
    I'll try again on Monday, may even purchase Apple Care first and then use that. The Apple Care Tech Support is typically better than the free level 1 call in support.
    Suggestions, comments, etc. are all appreciated.
    nlc
    <SCRIPT language=JavaScript>
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  • Loss of internet connectivity after upgrading to windows 8.1

    Hi, After upgrading to windows 8.1 from windows 8 i am experiencing major problems , loss of internet connectivity for no reason both I.E. and G/CHROME are now taking an age to open there are no virus issues as far as i can see.
      I have uninstalled and re-installed  windows 8.1 about four times over the past 9 months or so and the same thing happens after all the updates are in it runs like a dream for say 6weeks or so then i get the same faults as described above then i uninstall/ re-install ok for 6 weeks .
      I would apprieate any help or advice thanks 

    Hi @BMATH 
    Thank you your query.
    I understand that after updating to Windows 8.1 about every 6 weeks you loose wireless connectivity for no reason  and the web pages are very slow to open.  If you uninstall and reinstall Windows 8.1 it works fine again for about the same amount of time.  You have done this about 4 times with the same result each time.
    Do you know if there is any changes at that time , perhaps an update?
    You stated you do not believe you have any viruses.  Just to be sure here are two links that will help confirm that.
    Microsoft Malicious Software Removal Tool
    Microsoft Safety Scanner
    After updating to Windows 8.1 have you checked for Windows updates?
    Have you ran HP Support Assistant ?
    Here is a link to Troubleshooting Wireless Network and Internet (Windows 8) that may also help.
    If the issue should remain please contact HP support for assistance.
    Please call our technical support at 800 474 6836. If you live outside the US/Canada Region, please click the link below to get a support number for your region.
    World Wide Phone Support
    Best of Luck!
    Sparkles1
    I work on behalf of HP
    Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
    Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping!

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