Lost Network Connectivity After Installing Windows Server 2003 SP1

I have an IBM x365 server running Windows Server 2003 Standard.  After applying Service Pack 1 I lost network connectivity.  I can ping the local host and local IP address but I cannot reach any other nodes on the subnet or the gateway.  Uninstalling Service Pack 1 brings network connectivity back.  I thought that there may have been a conflict with my antivirus software (SAV 10) so I removed it and tied applying service pack 1 again, but the same problem returned, no network connectivity.  I looked at the Windows firewall settings, and the service is disabled.  Any suggestions would be appreciated.
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I would suggest a BIOS update on the server...see the readme.txt, there was some boot issues with an older BIOS when SP1 is applied.

(BTW, I have a x365 with R2 on it now...no problems, but I am running the latest BIOS)

happy16bitAuthor Commented:
My original information is skewed a bit.  It is an x345 not an x365 and I checked the BIOS and it has been updated due to a DASD issue was had a few months ago.
ah...have you checked the IBM support knowledge base?

If it's only network connectivity I would install the latest OEM drivers (Intel right?) for the NIC, then install SP1.  That should prevent sp1 from trying to update the drivers.  Don't let it update them through windows update, etc. just for reference.
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Update for above post...are you saying it shows the NIC as enabled and connected still but no net connectivity, or does it say "cable unplugged" or not even show the NIC correctly?
happy16bitAuthor Commented:
Answer to above question: The  Network connection shows enabled and plugged in.  I can ping the loop back and local IP address, but nothing else.  I tried a new cable, a new switch, another subnet, and the other NIC.  The problem seems to be in the software somewhere.
I would start with getting the updated drivers for the NIC from Intel...(simplest would be from another machine, then burn to CD).
happy16bitAuthor Commented:
I updated the NIC drives form version 7.3 to the newest ones put out by IBM (Version 8.6) before installing SP1 but it made no difference.  Still no connectivity and the drivers were not changed.
Besides SAV, is there any other 3rd party software installed?
Is there a firewall between this server and something else that has an IP?  There is a known issue with communication loss after SP1.



Pinging may not be a good test as noted above.

happy16bitAuthor Commented:
The server is an SAP portal server.  It is running an Oracle database which is accessed through IIS.
happy16bitAuthor Commented:
I came up with a solution:

In had missed an entry in the system log that stated the following:
"The IPSec driver has entered Block mode. IPSec will discard all inbound and outbound TCP/IP network traffic that is not permitted by boot-time IPSec Policy exemptions. User Action: To restore full unsecured TCP/IP connectivity, disable the IPSec services, and then restart the computer.  For detailed troubleshooting information, review the events in the Security event log."

So,  I disabled the IPSec service and am now able to connect to the network and ping the whole world. :)

Thanks for you ideas Netman66 and TheCleaner they all made a lot of sense.
hah...well yeah that would do it...

Although they shouldn't need to be disabled...just check your IPsec policies and make sure they are correct (or not there if not needed).

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Windows Server 2003

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