I have setup a multi-server environment with one 'master' server and several 'slaves' using this guide: https://www.howtoforge.com/tutorial/ispconfig-multiserver-setup-debian-ubuntu/ All servers were set up with Ubuntu 20.04 LTS and ISP Config 3.2 . Initially, everything worked well but since a few months, the System State reports wrong OS versions and/or ISP Config versions for 3 of the 8 servers. Since a few days I found that applying changes to one of these 3 servers results in a number of outstanding tasks in the Jobqueue on the master server. I checked the following: All servers have a root user with password set and these have been added to the master server (step 2.2 in the instructions). All servers have port 3306 open in UFW for the master server (step 2.3 in the instructions). I manually updated the OS's as well as ISP Config versions on all servers, including the servers affected, all to the lastest version (Ubuntu 20.04.3 LTS and ISP Config 3.2.7p1). Where necessary, the individual servers were restarted. I performed a full resync from the Tools Section on the master server. Yet, the OS and/or ISP Config versions of the 3 slave servers are still reported wrongly and the the Jobqueue remains filled with tasks for one of those servers. What could be causing the faulty report on the affected slave servers and how do I fix this?