Originally Posted by Raffnix
But after starting ISPconfig. I noticed, that in the Services overview FTP-Server was offline. Restarting didn't change anything and trying to restart on the shell returned:
- warning: "ProFTPD" address/port (xx.xx.xx.xx:21) already in use by "Debian"
please have a look here:
The problem is that proftpd binds the port on all IP addresses with its default server and then cannot bind with the later defined virtual servers.