As reported here > https://www.howtoforge.com/communit...sses-existing-multiserver-installation.59275/ < years ago, the company I used to work for was planning to return the IP block they had ISPConfig running on. I left the job, and for a long long time nothing happened. So, by the end of last year, they called me asking for help, 'cause they had to return the address block until the next weekend. Now, they are an AS on the internet and they have their own netblocks. I got in touch with their current Sysadmin, we created a /28 block to put those servers, and I went on to reconfigure them. The Panel interface (and the Master server) is running on the primary DNS server, and it's working fine, but there is no communication between servers. Master does not get updated stats from slaves since the 5th of december. It isn't possible to create new SSH users, MySQL databases, or create mailboxes. Some data that might be useful attached. What can we do to troubleshoot this? Thanks.