proFTPD unable to determine IP address

Solution 1:

Please change /etc/hosts from

88.198.61.237  Debian-70-wheezy-64-minimal
2a01:4f8:131:2a::2  Debian-70-wheezy-64-minimal

to

88.198.61.237  web-amd-3700-2gb
2a01:4f8:131:2a::2  web-amd-3700-2gb

or (better) fix the setup to have a proper FQDN and naming scheme.