PC's randomly going offline and Event ID's SRV 2012 on SBS 2008

Im having a problem with one of my customers

Randomly PC's go offline (not all at same time) and have noticed SRV event ID 2012 (While transmitting or receiving data, the server encountered a network error. Occassional errors are expected, but large amounts of these indicate a possible error in your network configuration.  The error status code is contained within the returned data (formatted as Words) and may point you towards the problem.)

I have replaced the network switch, network card in server (to another type as well), made sure server is up to date, run SBS 2008 BPA, and put server on a different connection to the switch.

Any one got any other ideas to try. Typically it never happens when Im on site
dolphinitukAsked:
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dolphinitukConnect With a Mentor Author Commented:
As a last resorts before checking each PC I changed the ADSL router. They havent had any offlines since Friday so fingers crossed that was the culprit
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edbedbCommented:
What were you using for a switch? What did you replace it with?
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Jason WatkinsIT Project LeaderCommented:
Hi,

Is the link speed for the NICs set to auto-detect.
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John Gates, CISSPSecurity ProfessionalCommented:
Does the switch have management capabilities?  If it does you will want to check the logs for any reports.
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dolphinitukAuthor Commented:
Was a 10/100 linksys switch and now a 10/100 Dell switch with 1 Gigabit ports (used another site for months with no problems)

The card is set to auto and using one of the gigabit ports on the replaced swict

The switch doesnt have any mangement capabilities
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edbedbCommented:
Do you have the model number for the Dell switch?
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John Gates, CISSPSecurity ProfessionalCommented:
Not to be negative but I had a one month go around with dell and I ended up putting a cisco switch in to solve the issue.  I even tried updating the firmware on the switch at Dell's direction to no avail.  We had the same issue.  Machines would get disconnected from a database application housed on the server.  My advice dump the Dell switch.  They can barely build a server and their switches are horrible.

-D-
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Jason WatkinsIT Project LeaderCommented:
At least, try a different switch to rule the Dell out as a suspect.
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dolphinitukAuthor Commented:
The Dell switch is one that I have put in as a loan to check it wasnt the switch. Had a 10/100 Linksys swicth when the problem first started
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edbedbCommented:
yes but it was in a different environment. This could be happening while it attempts to transfer large files. It might be causing it to heat up and fail. This is a problem with many routers and switches.
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dolphinitukAuthor Commented:
The Dell switch is a Powerconnect 2324 and is a temp replacement for a Linksys EF3116
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dpacpaCommented:
I'm having the same issue.  Original switch was a Netgear 10/100 and I replaced it with a gigabit version which made no difference.  I removed Symantec and changed to Trend for antivirus which has not helped.  Issue seems to only be happening on 5 new Windows 7 systems recently added to the network.  I disabled all advanced network settings on the server and 2 of the workstations which has not helped.
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dpacpaCommented:
Sorry - disabled all advanced settings on the NIC's on the server and 2 of the workstations which has not helped.
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dolphinitukAuthor Commented:
Still havent resolved it here. Was 2 other mini switches on network and have replaced them. Updated the anti virus (AVG) to new 2011 version (even though AVG hasnt caused any such problems on any other networks I look after).
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Jason WatkinsIT Project LeaderCommented:
Maybe updating the driver on the server's NIC may prove useful
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dolphinitukAuthor Commented:
Have changed the NIC to a different type (Broadcomm to an Intel gigabit) and made sure driver is the latest version available on intels site
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