Definitely the RU server (and it's address book) is holding onto the old DNS name (somehow restoring the connections old settings) and not updating from the client even though it's deleted from the server and verified gone before reinstalling.
After all the above: Checked host properties URL for Internet-ID Connection Settings...: Shows new URL Under server address book manager | Edit connection | Connection tab | Shows Internet-ID Server: old URL Viewer shows the same information as the RU Server connection
Testing sync status, renaming the name of the client in viewer shows the rename in the server address book manager verifying sync is working.
Deleting a client in the Viewer, client is left in the Address book manager in the local server.
Restarting local RU server makes no difference.
There is a 2nd bug, but I think it's related to this same issue.
Did initial testing using one DNS name for the local hosted server. I've since changed to a different name.
Test: Close local viewer. Open RU Server Address book manager Delete client restart RU Server Verify client isn't in Address book manager. Uninstall Host and manually delete Reg key and folder per: https://www.remoteutilities.com/support/docs/installing-and-uninstalling/ Make new One-click installer with the new URL to Local Internet-ID. Create new ID and replace existing ID both enabled. When it re-registers in the RU server the viewer is reporting (under the Connection type) the old DNS name instead of the new one.