We recieve a lot of warnings in event viewer/app on TMG server:

Forefront TMG disconnected a non-TCP connection from DOMAIN CONTROLLER

We already added this domain controller on TMG's Flood Mitigation IP Exceptions list but that did not help.

Those warning events are still shown on Event Viewer/app on TMG side.

Any hints how to solve this problem please?

with best r

Do you just want to get rid of the messages or are you seeing an actual issue related to this?

TMG is quite aggressive in disconnecting connections in order to preserve resources, this is most likely what you are seeing.