Mornin' ! I'm having problems with AD not replicating across sites, there are three sites in the domain, all running server 2003, site 1 is the central site and replicates without any problems to site 2, site 3 cannot ( or will not) replicate to sites 1 or 2. Yes, ive checked all necassary ports are open on the hardware firewalls using portqry and the RPC services are running on site 3's DC. AD sites & services appears to be set up correctly, based upon the topology of sites 1&2, all relevant subnets are listed and assigned to the correct sites. I've tried forcing replication from all sites, still with the same error... replmon can access all sites and confirms connections (and the errors!) All DC's were configured and AD replicated at site 1 before being physically and logically - within AD anyway- moved to their final locations All sites are connected by WAN links, using VSAT, all sites can see each other and logon using remote desktop and logon to http & ftp servers. I have four other domains using the same topology all with remote sites connected via VSAT and they're quite happy.... Any ideas? Cheers, 10forcash