Hello,
We are using TMG 2010 SP2 update 5. We are using web chaining. Out upstream proxy server is Messagelabs. Since a few weeks we are having problems downloading large (>1GB) files. It al started when Messagelabs changed something. Since a few weeks / months they pre-download and scan the files. It seems while Messagelabs is downloading the file there is a timeout. On the client we see a message "the download was interrupted".
I'm not sure how to fix this.
Any ideas?