I have pretty strict iptables on the dedicated servers and it appears that packets from DH are dropped (I checked logs and no sign of ssh activity from DH). I have rules to allow ssh from a few IPs, like this, in iptables:
target prot opt source destination
ACCEPT tcp -- my.dh.ip.addr 0.0.0.0/0 tcp dpt:22
So ssh packets from DH should get through ( I have a dedicated IP at DH ). That same rule is used for my work IP and I can login from there no problem.
I've quadruple checked the IP numbers. Still no luck.