28.01.2019 18:15, Stefan Heymann [email protected] [firebird-support] 
wrote:
> Does anybody have an idea what is going on here?

   Yes. Router (CISCO most likely) or firewall (Comodo) breaks inactive TCP 
connection.

> DummyPacketInterval = 0 (but this should be irrelevant for this type
> of issue)

   Try to change it. This _is_ relevant for this type of issue.

> The admin says there is nothing the routers that would cancel TCP
> connections after a while.

   Ask him to check again whole trace between server an client where this issue 
appears.


-- 
   WBR, SD.


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