Ubuntu 22.04 support

Hello,
A very basic question.
My situation: VM in the cloud with Ubuntu 22.04(fresh install and up to date) with Urbackup server 2.5.25 only, ufw disabled, internet mode.
The client: Win10Pro 21H2, urbackup cient 2.5.19, downloaded from the server, the auth key is ok.
First time, I tried with default settings (WanIP), and also with port settings(ex. 50300) without success, on the GUI client status offline, the only message is: Connected to Internet server.
Nothing in the logs on the client and the server.
What did i forget, or where is the mistake?
Thank You. Adam