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503 Proxy Is Busy on IIS6

Hi i have a SBS 2003 SP2 server running ISA 2000 and IIS 6.

Everything has been running absolutely fine up until yesterday when all of a sudden, we get the 503 - Proxy Is Busy error when trying to access the default website.

I have checked in the following Logfiles for any kind of hint as to what may be happening

%SystemDir%\system32\LogFiles\HTTPERR\httperrxx.log
\W3SVC1\EXxxx.log
%SystemDir%\system32\LogFiles\W3SVC4\EXxxx.log

I have recently had to apply a fix to the server because ActiveSync had broken because a hotfix caused the server to grab the Exchange push port during boot up, this is now resolved. HOwever a day later this occurred and i can't help wondering if tehre is a butterfly effect here.



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Andy_1205
Asked:
Andy_1205
1 Solution
 
Andy_1205Author Commented:
As an addition:

I have rolled back the changes made due to the scvtivesync issue and removed the ports it demand i use, and its made no difference.

The strange thing is that when i reboot the server, the page loads fine for 10 minutes, but then just stops with the Proxy is busy error.

Is there any way i can check to see where these concurrent connections are that its having problems with?
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Rob WilliamsCommented:
Might you have installed Microsoft patches KB951746 and/or KB951748 (DNS patches) ? Though I haven't seen this particular error, there are issues with services and ports being blocked on SBS (especially w/ ISA) after their install. Susan Bradly has written a good article outlining the work around by manually adding the necessary ports within the registry, if it appears to apply.
http://blogs.technet.com/sbs/archive/2008/07/25/new-kb-articles-released-concerning-issues-around-dns-security-update-953230-ms08-037.aspx
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