Unable to connect to Repository after installation

I get this error message when attempting to login to Repository through ER/Studio DA client.

12:12:10.047 - Start Repository Login process...
12:12:10.047 - LOG IN request sent to Repository. Waiting for reply ...
12:12:31.157 -

Detail(s) :
Socket Connection Error -
Please make sure the Repository Communication Server is running on your server machine.
00:00:21.157 - Total time for the whole process.

I've verified that Repository Communication Server is running on server machine along with 3 other Idera services, connection to DB (no firewall / SSL issue), no SSL, I've tried restarting server.

We are installing Professional Edition Repository only (not Team Server). Windows machines, SQL Server databases.

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