We had a server (centos 5.2) with DA (version was the one before 1.36.0) with over 100 sites on them.
- The server was behind a Hardware Based firewall (WatchGuard) with the following ports open to public (80, 110, 143, 25, 21, 53, 443, 2222)
- SSH port 6022 was only open to our IP 202.62.33.2...