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With my work around I’m in good shape now but I thought this might be of some interest to others. Notice that it says nxnode already disabled which to me looks like the source of the problem.
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NX> 111 New connections to NoMachine server are enabled. NX> 162 Service: nxnode already disabled. The output I get from that may shed some light on the problem: So I created a script to execute that command 30 seconds after startup of the machine. On the host machine I could then connect normally until the host had to be rebooted. After a bit of research and trial and error I determined that if I executed: A few days ago I started getting a black screen when connecting to one of them, followed a few seconds later by disconnection. Everything about the two servers is as identical as I can make them. I am using the latest free version to connect from a Linux Mint 18.3 client to two Linux Mint 18.3 servers.
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