Zabbix HA cluster question

[olegus]

I'm trying to setup HA cluster with 2 servers, servers can see each other on port 10051,
HANodeName and NodeAddress are set as expected.
When I start both servers, they are both reporting to be in HA mode, but in different clusters.
Server 1 lists only itself in HA cluster and server 2 lists only itself in its own cluster.
How to troubleshoot?
Are there other ports that need to be open?

[olegus]

Mystery solved - it was a stupid typo - database name on a second server was different.