Having this issue with ePO 5.10 Update 6 and TIE 3.0.0 as well. I've rebuilt the TIE server, removed and re-added the extensions, and tried to create the Postgres db as a registered server manually in ePO but the test connection fails.
The TIE server and the ePO server are in the same subnet, so no ports need to be adjusted since they both have unfettered access between them.
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