Symptom
Message in browser
Internet Explorer cannot download "filename" from "servername". The connection with the server was reset.

Message in cogserver.log
DPR-ERR-2072 The request failed. It was directed to a server that is not reachable.

Problem
Unable to run, save or download large reports

Cause
The CGI/ISAPI timeout setting is too low. 

Solution
Increase the CGI/ISAPI timeout setting in IIS on all the Cognos gateway servers