Smoothwall blocking RCP traffic? SYSVOL not replicating between site DC's
We share our domain and network with another school a mile away, both schools are connected via a managed VPN with virgin media. We both got a 3000 smoothwall unit installed over the summer holidays and i've just noticed that our SYSVOL folders are not replicating, it is between their two domain controllers but ours aren't. We have 4 domain controllers in total, two at each site but the other school holds the operation master and catalogue server, when i check the event log event 13508 warnings pop up and the exact same time we had our smoothwall device installed with no following 13509 event to say replication completed.
AD seems to replicate fine, so does DNS - Logged a call with smoothwall but it's causing further issues which i need to get sorted ASAP - Can anyone think of why we are not replicating?