@tjkreidl hi, it is 2.2.3-1 the latest version. All of a sudden it seems. that the cluster is working again... no timeouts anymore. totally weird.
BUT - xcp-ng center takes long time to synchronize the hosts.
Before the timeouts ended. I had fixed a bug in /etc/ha-lizard/ha-lizard.func in line 645, where the were reading a pool-param-get what did never work. and obviously this was running much too fast and spawning so many processes, that the rest-api was dead.
This fixed a million error-notifications with in the error log. After restarting ha-lizard (service ha-lizard restart), everything returned back to normal.
Although the timeouts are history the wrong query wich creates the backtrace (authentication error) is not fixed yet. Probably this is an issue. the guys at ha-lizard know how to fix.
Thank you for helping me out!