Error 500 when google indexing robots visits my website (IIS)

Question

I've developped a website in asp.net mvc3 and I'm thus hosting it on a windows server (OVH).

The domain name is registered with GoDaddy and I thus have edited the DNS record of type A to point to my OVH hosting server.

GoDaddy DNS records
-------------------
Host :      @   
Points to : [Server-IP]
TTL :       1 Hour          

Host :      www 
Points to : [Server-IP]
TTL :       1 Hour

Therefore I can visit the website but when Google Robot try to visit my website, it gets an error 500 (which means a server-side error), which cause my website not to be indexed by google, bing and other search engines.

I can view an error 500 every week in Google Webmaster Tools error log whan the robot try to index my website.

Do I have made a mistake while configuring the DNS record on GoDaddy? Or do I have to edit something in the IIS Manager ?

Thanks a lot !

Answer 1

500 usually means there is an error in your code. Check windows event logs for .NET exceptions or setup ELMAH to log all uncaught exceptions.