Hello, I have existing server1 wanted to add new server2 (used The Perfect Server - Debian 8.4 Jessie (Apache2, BIND, Dovecot, ISPConfig 3.1 guide to setup server1 & server2). So I followed HowTo: "Installing a Web, Email & MySQL Database Cluster on Debian 8.4 Jessie with ISPConfig 3.1" exactly per guide (I tried 2-3 times already), every time on the last step in section 5.5 MySQL Master-Master-Replication and check the slave-status with SHOW SLAVE STATUS \G Check, that the slave is running: Slave_IO_Running: Yes Slave_SQL_Running: Yes I get error: Last_IO_Errno: 1593 Last_IO_Error: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server ids; these ids must be different for replication to work (or the --replicate-same-server-id option must be used on slave but this does not always make sense; please check the manual before using it). Error message is misleading, I double checked, server IDs are 1 and 2. I tried to restart mysql master-master replication (per schaal-24.de guide), both options skip the error and rebuild still did not work I cannot get to the result where original guide shows Slave_IO_Running: Yes Slave_SQL_Running: Yes What am I doing wrong? I would appreciate any assistance. Thanks!