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.



Andy_1205Asked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

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?
0
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
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
SBS

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.