Something here could help.
https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/troubleshoot-dfs-namespace-guidance
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
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We have 3 DFS servers replicating several namespaces across them. About 2 months ago one of the namespaces stopped replicating and we've been trying to sort it out. I can't see any errors in the Event Viewer. and the reports that I've run say everything is ok. But it is most definitely not. So I think I am looking in the wrong places for what has gone wrong on this namespace.
Any and all assistance is appreciated as I am fully out of ideas and google searches.
Something here could help.
https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/troubleshoot-dfs-namespace-guidance
--please don't forget to upvote
and Accept as answer
if the reply is helpful--