Win XP IIS 5 & Ajax's Update Panel

Came across a problem yesterday, where all of a sudden a website that I was working on behave wildly. The website that I'm working on has a page that would utilize UpdatePanel to add dynamic web control that will be triggered with a click on a node of a TreeView control.

I was trying to add control to the page, and all of a sudden I received an error message stating HTTP 403: Resouce forbidden, or some other unknown codes. This is the first time I encounter this kind of issue, which really bugging me because I know that IIS on Windows XP has a limitation on its connection pool(maximum 10). I've never encounter this kind of issue before, so it took me a while to try to do some research with the help of the Internet to see if I could find any solution to this kind of problem.

According to one article, it will help by lower down the connection timeout and disable the HTTP Keep-Alive under IIS, which it does help, but then again it will cause Visual Studio 2005 not able to log on to IIS for debugging a website. So I've concluded that I'll need to configure the aforementioned settings according to situation.

However, after the configuration was reset back to its default value, I did a test again to day to see if I'd still get the same HTTP 403 or any relevant error, but no. I could add more than 10 dynamic web controls onto the UpdatePanel, without getting the error, which kind of weird. The last thing that I did was to defrag the Windows XP hosting the website, but would that actually causing the website to malfunction? I wonder...

Anyway, in case of emergency, this could be a helper. First, disable the HTTP Keep-Alive under IIS, and set the connection timeout as low as possible to release the connection back to the connection pool. Worst case scenario, defrag the machine.

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