Guys, I am at a loss here... So I am currently working on some AD issues for one of our customers.. They currently have 4 Domain controllers and one of the domain controllers is having issues with replication. When I make a change in the group policy on my main domain controller, I see that same change reflected on the other 3 domain controllers but not on the 4th domain controller once replication occurs. Looking at the SYSVOL folder, I can see that replication has not been working for a while, there are missing polices, etc... Here's what I've done. 1. I ran Replmon and I see that it show's everything replicating appropriately 2. I manually forced a replication from AD Sites and Services in the NTDS settings 3. When I ran dcdiag /test:replications, I get a sysvol from dc1 - dc2 mismatch. This makes sense as the sysvol folder on my 4th domain controller is not replicating with the parent domain controller. 4. I ran FRSdiag and could not see much, I even pushed a replication through there and to no avail. 5. Event viewer shows that the replication service is running accordingly, it has issues with one domain controller from time to time but not always. The actual replication has not worked since 1/5/2010 so it's been awhile. 6. I rebooted the domain controller 7. Last thing I tried, was doing a non-authoritative restore on SYSVOL and nothing! 8. Checked the replication service is started and even restarted it (first thing I did lol) Honestly, I don't know what I am missing, at this point I am thinking about demoting the domain controller and then promoting back so at least the SYSVOL directory would be recreated. I am honestly not sure if its the replication service at this point, could be a corrupted SYSVOL directory, etc... Any suggestions would be greatly appreciated.