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Intermittent conection to LAN

Posted on 2013-12-10
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Last Modified: 2014-02-27
Hi Experts, this one has got me stumped...  We have 4 servers on our SBS 2003 domain.  We have about 40 users on our network.  For the last week at about the same time in the afternoon for about 1-2 hours,  I have about 6 users on the domain that loose connectivity to the primary domain controller. Users are spread out in different locations that are connected to managed switches ,so not just one switch/location that people are experiencing the issue.   I am unable to ping the PDC from those users, however network shares to other servers are fine and I can ping member servers with no problem.  Email and internet for those users are down ( services provided by the PDC).  Also these users share the same POE connection to their IP phones and the phones work just fine as well.  I have serveral Procurve switches that I have been monitoring and I do not see any excessive traffic and all ports on the switches seem to be operating just fine.  I check the event viewer on the PDC and absolutely nothing in the logs that would hint to a problem.  I also checked DHCP all leases are fine, no confilicts.

Any ideas on what I should look at to try and narrow this down?

Thanks,
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Question by:Mikejett
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Expert Comment

by:guswebb
ID: 39710149
I've seen this before on PC NICs mostly and once on a server NIC following a driver update. Sounds like the issue may be server-side. Check the NIC driver properties and that it doesn't have the ability to power manage itself and thus go to sleep when it thinks it is not busy/required. The regularity and timing of the outage might suggest it's not this possible cause but let's eliminate that possibility first.

Can you also confirm if other users are able to ping the PDC during the outage that affects the 6 users you mention? If so, then that certainly eliminates the above possibility.
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Author Comment

by:Mikejett
ID: 39710349
The odd thing is that it is just those 6 users.  Everyone else on the network is fine.  One other thing to note is everyone is on XP, the 6 users are on Win7.  Although they have been working fine in the past with no incidents.
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Expert Comment

by:guswebb
ID: 39710658
So you have lots of users on XP and only six users on Windows 7, and only the six Windows 7 users experience this issue?
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Author Comment

by:Mikejett
ID: 39711281
Yes that is correct.
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Expert Comment

by:guswebb
ID: 39711283
You mentioned there's nothing in the server logs but how about on the client machines?
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Author Comment

by:Mikejett
ID: 39711331
at around the time it goes down, this is what is in the event viewer: Event error 5719:

 This computer was not able to set up a secure session with a domain controller in domain XXX due to the following:
There are currently no logon servers available to service the logon request.
This may lead to authentication problems. Make sure that this computer is connected to the network. If the problem persists, please contact your domain administrator.  

ADDITIONAL INFO
If this computer is a domain controller for the specified domain, it sets up the secure session to the primary domain controller emulator in the specified domain. Otherwise, this computer sets up the secure session to any domain controller in the specified domain.
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Author Comment

by:Mikejett
ID: 39711345
Checking other machines, also going to reboot server.  Trying anything at this point.
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Expert Comment

by:guswebb
ID: 39712406
Can you try allocating static IPs to these machines just as a test and see if the issue recurs?
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Author Comment

by:Mikejett
ID: 39712474
On one of them I did assign a static and did not help.  I'm disabling IPV6 on network adapter to see what that does.

XP machines only have TCP/IP, Client for MS Network and File and printer sharing checked.

WIN7 Users have: the same as XP machines plus  Qos Packet Scheduler, Link-layer topology discovery mapper I/O driver and link-layer topology  Responder.
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Expert Comment

by:guswebb
ID: 39712674
Will be interesting to see if disabling IPv6 resolves the issue.
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Accepted Solution

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Mikejett earned 0 total points
ID: 39753999
I discovered that our WAP was causing the issue.  I have unplugged the device and the issues go away.  I had WAP2-Personnal authentication setup.  I've change it to WEP.  From what I've read, the frequent authentication for WAP2 may be the issue.  Don't know as of yet, but I will try that out.  Everything else relative to firmware updates and settings is good.
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Author Closing Comment

by:Mikejett
ID: 39891373
The WAP was indeed the issue, after changing authentication modes, problem has gone away
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