Hello all,

I have a customer who is reporting this scenario:

He has several type C networks (192.168.x.y) routed together. When a
client is inactive for some time (e.g. a few hours) the connection
gets lost, BUT ONLY when the connection is from another network than
the one the server resides in. Connections from the same network stay
open.

The error that the client gives is "Unable to complete network request
to host "XYZ". Error writing data to the connection."
I assume this is because the TCP connection to the server was somehow
half-closed.

Does anybody have an idea what is going on here?

Firebird 2.5.5 64-bit on Windows 2012 R2
DummyPacketInterval = 0 (but this should be irrelevant for this type
of issue)

The admin says there is nothing the routers that would cancel TCP
connections after a while. (I can't check that because I don't know
how to configure routers and I don't know how skilled this person is.)


Regards

Stefan

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Stefan Heymann, Tübingen, Germany