Hi,
Test to do the following steps:
1. create a new file server, add it to the replicaiton group and works like a hub server.
2. Set the new server as a namespace server (if DFS namespace is also configged)
3. When replication is finished, delete the old hub server from DFSN and DFSR.
4. Waiting for the AD replication to finish or force an AD replication.
5. Physically remove the old hub server.
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