Outlook 2013 no longer has connection with Nethserver

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Is there something more at the log? I’ve found some entrys at sophos forum with your error message, but they have always a message with timeout too.
The solution is to increase the HTTP Keep Alive Timeout to 3600.

https://community.sophos.com/products/unified-threat-management/f/german-forum/78203/waf-fur-exchange-2010---active-sync-errors

Sorry it’s german but I’ll translate the answer with the solution for you:

Hi Bob,

before 2 days i set the HTTP Keep Alive Timeoutvalue to 3600 (before I only tried 2000). Since this moment I don’t have any errors at the logs.

The topic seems to be done. Thanks for your help!
Greatings
Thomas