Connection Between Client and Main PC (Server)

[black.13]

Hi,
I have windows 7 x64 sp1 on client and windows 10 x64 Pro on main pc (Server). The earlier version of Veyon was working perfectly. But i'm facing issues with current version 4.3.5 of Veyon.
All the thing s are good. Fresh windows installed on client and server.
New key generated and deployed on both ends.
But still unable to monitor the clients form server pc.

Ann Idea what to do now?