End the problem!
(before update windows not problem. master can connect to all client.
after update windows master can't connect to some client.)
For fix this. we "create key pair" and import key to all client. and General>Authentication> Select "Key file authentication" > Apply
[image: 1747817477239-57081873-e29f-4685-88f3-68bdd09dfcbf-image.png]
We have the same problem, sometimes the Veyon Service into clients PC doesn't start.
To verify this, logon on unreachable client as administrator, run Veyon Configurator and try to start service manually.
At moment we haven't found the cause.