Hi, I have followed this tutorial: http://www.howtoforge.com/perfect-server-ubuntu-12.04-lts-apache2-bind-dovecot-ispconfig-3 and all worked fine. I added dropbox and TS3, with separate users that run the programs. However, after several restarts of the server, suddenly all ports are blocked and I can't access the server in any way anymore. Any idea how that can come to pass? Best regards, Heinrich K.