I currently have several web sites running on Server 2003 - IIS 6, Framework 3.5. I am upgrading one of the sites to use Framework 4.0. To convert the web site, I performed the following steps in IIS:
Stopped the web site
AST.NET Tab - Changed version to 4.0
Home Directory tab - Clicked "Remove" button for application name. Entered a unique new name and clicked "Create".
Closed proprty window
Moved my new code into local path
I then tested the website in IE and it worked fine. Rebooted the server, tested again, and now this website and all others were throwing error 503. I found the following entry in httperr.log:
503 N/A DefaultAppPool
I spent a considerable amount of time researching this error but was not able to determine a fix. Ultimately I had to revert the web site back to .Net version 2.0 in the ASP.NET tab to resolve the issue.
About a month ago I converted a different website on this server to Framework 4.0 and there were no problems. I am looking for advise on how to address this situation.
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