so it seems to be a routing table error...
site is hosted on 78.x.x.x subnet and they consider the traffic from these ip as internal (in other words a host immunization like 127.0.0.1 or similar)
in other words they consider Be/O2 ip as their own internal local ip....
I hope it should be only a bug from their point of view, I hope there's nothing else (blacklists, traffic limiter, etc)
I will make a notification on their own support forum, linking also this thread and the other one on skyforum