Cognos 10 Report Studio DPR-ERR-2079 after a period of inactivity.

[jharmor]

Our Report Studio users are getting a "DPR-ERR-2079 Firewall Security Rejection. Your request was rejected by the security firewall." error in report studio after a period of inactivity. This is a new distributed installation of C10 and we didn't receive this error in C8.4. Users could leave report studio open for hours with out any errors.   

[Suraj]

What have you set in 'Inactivity timeout in seconds' field in cognos configuration under authentication?
Give it a big value such as 28800 and see if that works.