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To add to my frustrating time this week with my 1418 error when setting up Database Mirroring under SQL Server 2005. I was dogged by a continuous 'Service Unavailable' message when trying to load a ASP.NET page under IIS running under Windows 2003 R2.

Typically 'Service Unavailable' is a nice catch all message that doesn't give anything away, and so it shouldn't as hackers learn about websites by generating exceptions.

Diagnosing the real reason for the error is a case of reading the IIS error logs and looking for one of these reasons on the Microsoft 503 webpage.

Microsoft Support has support articles 823552 & 842493 covering the other reasons that cause the error.

Well I've found another reason that causes this message to appear I haven't found documented else where, hence the reason for the post.

If IIS isn't installed initially with the operating system and service pack 2 is then applied, then install IIS from the original media will cause IIS to not work and consistently throw 'Service Unavailable' when asked to build and display a page.

The answer is to re-install service pack 2 after installing IIS and 'Service Unavailable' message will disappear for that reason.

Obviously installing IIS over service pack 2 forces some kind of retrograde step to happen which the install process does not detect but this is only my assumption.

Anyway, I hope this helps solve this issue for you if you stumpy across this post which I hope Google is kind enough to put somewhere not to far from the first page. Please let me know.

Posted on Sunday, May 18, 2008 3:09 PM Main | Back to top

Comments on this post: One more reason problem that causes the 'Service Unavailable' error from IIS.

# re: One more reason problem that causes the 'Service Unavailable' error from IIS.
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Dave Edwards your comments are as relevant to me now as when I worked with you. I dislike Bully's and I won't be bullied on my own blog. Sure, take potshots at me from your own blog but I doubt you actually have the gutts to start one and prove to the world just how smart you are.
Left by Dave Oliver on May 20, 2008 9:30 PM

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