I have an ASP.Net 2.0 Website running in a production environment on IIS 7.5.
We have recently started getting serious performance issues with the site. I have elminated most causes i.e. network and code and are left in a strange situation.
If I run the website on the Virtual Server (Windows 2008 R2) under which IIS is running the website responds resonable quickly 30 seconds to complete a complicated operation. If I run the website from the Virtual Machine housing the Database that is on the same physical box the operation takes 2 minutes rather than 30 seconds?
I have used some logging software (fiddler) and this shows me that when on the same box as IIS the IIS server receives the request, waits 30 seconds then sends the response. It also shows that when on the DB Box the IIS server receives the request, waits 2 minutes and sends the response.
I have a feeling this may have something to do with authentication or security of somekind as the delay only ever happens when accessing the site from outside of the IIS box? Can anybody help me narrow down how and why this might be happening?