NoMachine server on MacOS quits upon a slow connection

[uli]

I run NoMachine servers (free version) on two Macpros at my home, and also on a couple of Rasperry Pi computers. Has worked like a charm for several months.

Now I am in a foreign country and find that I can connect to the Macpros, but I am not able to initiate any action like clicking on a window to get it to the front. Instead, the connection gets dropped after maybe half a minute. This is consistent behaviour. The Raspberry Pis on the other hand, while sluggish as well, can be used and do not drop the connection. Is there a configuration variable that might control a time-out behaviour of the server on MacOS?

The MacPros run different versions of MacOS, but both behave the same. NoMachine is at version 9.x.

Thanks for any hints.

Uli

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