Slow connectivity with DCs

I get an error popup-ing up many many times a day on my ISA Server.
It says I have slow connectivity with my DCs. What happends then, people have to re-enter their Logon/Password while navigating on the Web. Like it was loosing the authentification with the DCs.

I even tried re-installing ISA Server on another machine, but I get the same error. Tried to change the wire between the server and the switch, and nothing gets it.

I have ISA Server 2004 SP2 Installed on Windows Server 2003 R2 SP2.
I don't seem to have any errors with other servers.
Can someone help, please!

Error:

Event Type:      Warning
Event Source:      Microsoft Firewall
Event Category:      None
Event ID:      21138
Date:            30/01/2008
Time:            8:04:42 PM
User:            N/A
Computer:      SERVER-ISA
Description:
The connectivity verifier "DNS2" reported a slow connection to SERVER-DC2. The specified connectivity response threshold was 5000 msec, and the monitored response time was 5265 msec.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
dranizzAsked:
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PlaceboC6Commented:
Since you are running sp2,  and you may have a modern nic that will take advantage of the features of the scalable networking pack...you might try disableing tcp offload and receive side scaling:

http://support.microsoft.com/kb/936594

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Milan_OjhCommented:
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dranizzAuthor Commented:
PlaceboC6, it seems to work, I don't have any errors in the event log.

Only thing not working is OWA and another site that I can't rely externally.

Internnaly they all work fine... I don't know if it's because my ISA IP changed.
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dranizzAuthor Commented:
My ISA server resolve internal server names with the external DNS (ISP) and not the internal DNS.

How do I set that. I have 2 interfaces, 1 LAN and 1 WAN with IP adresses set up correctly.
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dranizzAuthor Commented:
The only clue I have that it's not behaving correctly, is that when I go into computer sets, in network objects of ISA management. When I do a find a computer, all my other computers point correctly to the internal IP address. The servers I want to publish web site return the external IP adress.

How do I fix that?
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dranizzAuthor Commented:
I am not sure if it was really the problem, since I had to change machine but it seems to work fine.

Thanks
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