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The TCP/IP ports that repmgr uses can only be used to communicate with other instances of repmgr; repmgr has its own specific wire protocol.
It doesn't work to try communicating with it via telnet, sending it some arbitrary command text.
Please refer to the ex_rep_mgr sample application (and the discussion of it in the Reference Guide) for an example of how to configure repmgr.
Repmgr works fine for us now.
We just worry about it's robustness, maybe we should add some checksum mechanism in bdb replicate communication channel.