Hi there,

just installed OX on one of my debian servers. Starting open-xchange-groupware ended in

"java.io.IOException: Network is unreachable" (found in /var/log/open-xchange/open-xchange.log.0)

To solve this issue, you have to set ipv6-bindings to 0:
/sbin/sysctl net.ipv6.bindv6only=0

or edit /etc/sysctl.d/bindv6only

Then do a /etc/init.d/open-xchange-groupware start and you're fine ;-)