yes, they are correct and mysql is running.
maybe not correct set hostname?
Feb 17 15:43:10 ns4004936 postfix/proxymap: warning: connect to mysql server 127.0.0.1: Access denied for user 'ispconfig'@'127.0.0.1' (using password: YES)
Where are the settings located?
It was the ip 127.0.0.1 ... was not allowed to connect. only localhost