28.01.2019 18:15, Stefan Heymann lists@... [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.