On the Updates page of the Symantec Web Gateway (SWG) User Interface (UI), the version of the antivirus rules appears older than 1 week. SWG attempts to download Antivirus definitions times out when connecting through upstream F-Secure proxy with AV function.
The connection timeout value for downloading virus definitions is 30 seconds in SWG version 5.2.0 and earlier.
Upgrade the Software of SWG appliance to version 5.2.1. If you are not able to upgrade immediately, please open a Remote Assistance case, then contact Symantec Technical Support.
To open a Remote Assistance case