IIS Server, sudden 404.4 on all sites The resource you are looking for does not have a handler associated with it

Question

I have a long standing IIS 7.5 box that suddenly stopped working mid morning today. Something has obviously changed but I have been unable to determine what and would appreciate any suggestion.

All of the sites on the IIS server have started returning the same error page when viewed locally - HTTP Error 404.4 - Not Found The resource you are looking for does not have a handler associated with it.

The server has a number of web sites on it, mostly asp.net but there are some others.

Things I have tried (in no particular order) -

• Restarting the IIS Server
• Restarting the Windows Server
• Setting up a plain static html website
• Comparing applicationhost.config with the versions in the history folder
• Checking the handlers appear to be configured correctly (they do as fas as I can see).
• Added FX_schema.patch.xml as per Unrecognized element 'ProviderOption' when trying to use Powershell Set-WebConfigurationProperty
• Checked the server logs but can't see anything around the time this started.

I'm at a loss now for ideas so would appreciate any suggestions.

Answer 1

I've found the source of this. A global rewrite rule had been setup that was redirecting everything.Disabling this meant all the sites were working again.

All I need to do now is figure out who made the change and have a quiet word with them!