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INVALID_SESSION_ID: Invalid Session ID found in SessionHeader

Hi all,


We have a web site (this site is working in a web farm) and we are developing integration with Salesforce. This integration have been working for many month. But now we've faced with INVALID_SESSION_ID error.


Anybody know why this error occurs ? 


P.S. "Lock sessions to originating IP" is turned off.

P.P.S. This error doesn't occur in the test environment.