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Lost all network connections

I have WSUS running on a Windows 2003 server as  a VM on VMWare ESXi, It has been plugging right along without issue for some time. Two days ago I rebooted it because it was asking for a reboot after updates. After the reboot the server did not respond on the network. I ran ping /t to it and rebooted, the server would respond to pings for a few seconds on boot then stop once the screen said "Preparing network connections". I did some searching online and found some recommendations about running RPC service as Local System instead of network service. I tried this and now it never responds to a ping at any point of boot. If i attempt to do a ping from the server itself to any IP on the local network it says "Destination host unreachable". The server can ping itself just fine but nothing else, there is no communication at all between it and the network. I tried adding another NIC to the VM and that NIC can not get DHCP. There are issues in the event log about GP's etc which I believe are due to the server not being able to see the network.

James.
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jamesjweg
Asked:
jamesjweg
1 Solution
 
warbringerCommented:
Please revert the change you made to RPC.  Reboot the server.  Log into the server, go to services, disable the IPSEC service.  Reboot the machine, see if "everything works".  Let me know if that solved your issue ...
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akhalighiCommented:
Check windows Firewall first , that's a killer.

Disable it and try again.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
let's have the output from ipconfig /all?

can you ping itelself by IP address and loopback address 127.0.0.1
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jamesjwegAuthor Commented:
All I can say is What the H---? It would not let me revert the account change on the service without NETWORK SERVICE password. Not wanting to further screw-up anything I left that alone a went to check-out IPSEC, it was set to Automatic and not running, I disabled and it, rebooted and boom everything works. You sir just made my day. Now can you explain why this happened?

James.
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jamesjwegAuthor Commented:
FYI, The firewall was off the entire time.

James.
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warbringerCommented:
There was an update that Microsoft made regarding DNS connections.  Now, some of the UDP ports overlap and hit IPSEC ports.  This makes IPSEC mad .. thus the lockdown.

You can edit the ports used by DNS requests to reserve (ignore) certain ports like the IPSEC port and avoid the lockdown.

Or, if you are not using IPSEC for anything, you can just disable the service and leave it disabled.  I would not recommend this .. but it is the easiest "fix" and requires no more work other than a click of a button.

for more information:  hit this link (it is for Small Business Server but it explains the deal and shows you the ports you should reserve).

http://blogs.technet.com/b/sbs/archive/2008/07/17/some-services-may-fail-to-start-or-may-not-work-properly-after-installing-ms08-037-951746-and-951748.aspx
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warbringerCommented:
and ... I forgot to explain how I know this ...

I manage almost 75 small business servers for customers.  They are all typically "up to date" ... and almost ALL of them went down the same Wed/Thur time period because of this update.  I did not sleep for 2 days.
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