CR XI R2 "Database Login Failed" Recycled application pool and now it works

Hello,
I have a web application using CR XI R2 that has several reports which are pushed a dataset. These reports have been runing fine until today when I received an error stating "Database login failed." "Object reference not set to an instance of an object" in the report viewer control.
I recycled the application pool and the reports started working again.
My questions are:
What could be the cause of this and how can it be avoided?
Why does recycling the application pool correct the problem?
Regards.

Hi Tom,
Recycling keeps problematic applications running smoothly, especially when it is not feasible to modify the application code. Recycling helps ensure that problematic applications do not cause other applications to fail, and that system resources can be recovered from unhealthy applications.
Recycling an application pool causes the WWW service to shut down all running worker processes that are serving the application pool, and then start new worker processes. Whether the WWW service starts the new worker processes before it stops the existing one depends on the DisallowOverlappingRotation property in the metabase. Recycling an application pool does not alter any state in HTTP.sys or change any configuration in the metabase.
Note:
When an application pool is serviced by more than one worker process, the recycle operation is staggered in some scenarios. Only when a worker process is recycled on demand or when all of the worker processes hit their memory limits at the same time would they be restarted simultaneously.
For more info regarding this have a look to this [article|http://blogs.msdn.com/david.wang/archive/2006/01/26/Thoughts-on-Application-Pool-Recycling-and-Application-Availability.aspx]
Regards,
Shweta

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