Hi! I did your HOW TO for multiserver setup: https://www.howtoforge.com/multiser...se-servers-on-debian-squeeze-with-ispconfig-3 But i did it with 2 vm Ubuntu 14.04 servers, one master for all except mail and the slave only for mail. When installing the mail server with instructions for ISPConfig 3 install: Select language (en,de) [en]: <-- en Installation mode (standard,expert) [standard]: <-- expert Full qualified hostname (FQDN) of the server, eg server1.domain.tld [mail.example.tld]: <-- mail.example.tld MySQL server hostname [localhost]: <-- localhost MySQL root username [root]: <-- root MySQL root password : <-- Enter your MySQL root password here MySQL database to create [dbispconfig]: <-- dbispconfig MySQL charset [utf8]: <-- utf8 Shall this server join an existing ISPConfig multiserver setup (y,n) [n]: <-- y MySQL master server hostname : <-- web.example.tld MySQL master server root username [root]: <-- root MySQL master server root password : <-- Enter the root password of the master server here MySQL master server database name [dbispconfig]: <-- dbispconfig Configure Mail (y,n) [y]: <-- y At this setting i had to input the password off the slave server else it said "Unable to connect to MySql"! MySQL master server root password : <-- Enter the root password of the master server And i from the slave server i can ping the master and also connect to it's mysql with mysql -u root -p -h <master-server-ip>. After this i could install ISpconfig and connect the servers in ISPConfig off the master-server. So my questions are: 1. Is there an mistake in the how to or is my install wrong? 2. On what server should i install Squirrelmail, and can i install it after ispconfig? 3. How to test, see if it works.... does it create any syslinks or files on the mail-server when i create email domain and mailbox? I can't test the emails because i'm allready running a mail serve... at least i think i can't. Thanks for help and your HOW TO guides!