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ISA Server stops at frequent intervals

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by shanghai sam

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Hi all,
I am facing a peculiar problem with the ISA server. It denies the web proxy service after a specific interval of time. Once this happens the users are not able to access the internet.

When this happens I tried using thenslookup command. At this time it is not able to connect to the DNS server of the ISP. Its gives this error message :

Can't find server name for address 202.177.128.34 : Timed out DNS request timed out.

But at this time I am able to ping to the DNS server only the nslookup command does not work . Also If I reboot the server I am able to browse. In a day this happens atleast 2 or 3 times. Without restarting the server this does not work.

The ISA server is installed in the integrated mode. Both the firewall and the web publishing are enabled. When the server is working fine I am able to connect to the DNS server using the nslookup command.

I have installed the Hotfix released by micorsoft security bulletin MS01-021. Also the service PAck 1 is installed in the server.

Please help in sorting out this issue.

Thanks

Regards
Kannan

2 replies

by joseph moore

When you say you have Service Pack 1, is that the ISA Service Pack 1, or Windows 2000 Service Pack 1?
Because there is a known problem with ISA routing UDP packets (and a DNS query goes over UDP), so if that is the problem, that would explain it. ISA allows TCP and ICMP packets to go (letting your PING work) but not UDP. So, if you do not have ISA SP1, then go here to get it:
http://www.microsoft.com/isaserver/downloads/sp1.asp
(please remove any spaces)

hope this helps

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