From: Pratik on
We are using IReportServerConnection2 interface implementation to provide the
credentials to the report viewer directly. The report viewer is placed on an
ASP.NET page. Our implementation is very similar to the one listed in this
blog post

http://blogs.msdn.com/microsoftbob/archive/2009/08/20/a-wrapper-for-running-sql-server-2008-reporting-services-reports-anonymously.aspx

Since last few months, we get this error randomly.

The underlying connection was closed. Could not establish trust
relationship for the SSL/TSL channel.
Inner Exception:
The remote certificate is invalid according to the validation procedure

We have always used SSL and it does work for most of the day. The
interesting thing is when we get this error, we just go to web.config of our
ASP.NET app and change the timestamp of the file - the reportviewer starts
working again.

The SSL certificate is valid and the reports are displayed most of the
times. But once we get this error, we have to change web.config to get this
to work again.

Any ideas?