Today I cannot connect to a computer that I recently connected to. Usually this has been something malfunctioning with the RU server. Note that I can see the screen on the logged-in thumb-nail, but the full control connect won't complete.
Knowing the standard response is to say upgade to the latest, I don't understand why existing installations are failing, with no change on either side of version. That's why I call out some disconnect with the server information, unless the server information changes with versions, making old versions not able to interact with the server data. But I did upgrade already this host and client pair, grudgingly, because of the ripple effect across all the machine installations. But the result is the same. I cannot connect.
Could you please try enabling the Use legacy capture mode checkbox in the Host Settings -> Other tab and see if this helps. Please make sure to restart Host after enabling the feature in order for the changes to be applied.
Yes, you can definitely update the Host Settings remotely via the Remote Settings feature. When using this feature, Host is automatically restarted when you submit the changes, so please allow a couple of minutes for Host to restart before trying to connect.