1) I have had this issue for years but until recently I didnt need to access the secondary machines a lot. Originally I thought it was a bug in MP and that other people would report it and eventually it would get fixed. No such luck. Now that Im using the secondaries daily, I was hoping to get this resolved
2) You misunderstood "Close and reopen the keyboard ...". What I mean is... If I close and reopen the MP session, then the keyboard usually starts working. I may have to close/reopen the session 2 or 3. Its a bit random.
I NEVER unplug the keyboard. The machine is in a rack in the garage and isnt easily accessible.
3) I dont have a VPN opened. I do understand how that could affect it if a vpn was active. Technically nordvpn is installed on the primary but I never use it. Someday ill uninstall it.
4) Both secondaries have a monitor installed. They are however in the garage so I cant physically see the monitors. That eliminates MP seamless mode.
What Im trying to convey is that when I launch a connection to the secondary, the desktop appears blank. If I wait 30-300 seconds, it will eventually draw the correct desktop image. At that point, the image is perfect until I close the connection.
Since Im experiencing intermittent video and keyboard issues at session launch, I was asking if there was additional logging or troubleshooting steps.
PS. Both my secondaries are poweredge servers and have a quad channel ethernet nic built-in. All 4 cables are jacked into the same lan segment for fault tolerance. Thus my box has addresses 192.168.0.251 through 192.168.0.254. This shouldnt cause any issues but as this maybe different than you are used to using, I thought i would mention it.
Would sending you a wireshark trace help?