I have 2 Gateways configured with outgoing connections and another to which they are connected. I have a third gateway with an outgoing connection to the same receiving gateway. This third one requests a connection which I approve, but in the Incoming Connections list of the receiving gateway this third one only shows "Unknown" for the Gateway Name and the Redundancy Role.
I've looked extensively here and elsewhere on the internet, where it was suggested that I try having the third outgoing gateway regenerate its certificate and gateway name. Neither of these things helped.
I believe this means that the incoming gateway is using that CipherSuite, but the outgoing gateway is not. There is a system property that you can set in data/ignition.conf where you can change which ciphers are used. It would look something like 'wrapper.java.additional.1=-Dciphers=X,Y,Z' or 'wrapper.java.additional.1=-DexcludedCiphers=X,Y,Z'. See Web Server Settings | Ignition User Manual and maybe Gateway Configuration File Reference | Ignition User Manual
My best guess is that the incoming gateway is using some non-standard cipher suite and the outgoing gateway hasn't been equipped to use it. It might be best to take a look at data/ignition.conf on the functioning outgoing gateways and see if they have been customized with cipher suites.