The underlying connection was closed: An unexpected error occurred on a receive.

I have SSRS 2008 running on a Windows 2008 server.  Recently when trying to access the report manager site, I get the following error:

The underlying connection was closed: An unexpected error occurred on a receive.

When I try to render reports, I get the following error:

Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

I have no idea where to begin; my IT department will not allow me access to the logs, so I'm hoping to do some troubleshooting online so I can point them in the right direction. 

paul truland