Unable to join Proxmox cluster - Connection error 500: RPCEnvironment init request failed


Active Member
Apr 3, 2018

I'm attempting to setup a 3-node Proxmox cluster via the GUI.

I have a separate network for Corosync.

My VM IP addresses are, and

My Corosync IP addresses are, and

On the first node, I was able to create one successfully, setting the ring0 address to

On the second node - I attempted to join the first node's cluster - however, I get the error:

Connection error 500: RPCEnvironment init request failed: Unable to load access control list: Connection refused

In this case, I had set the ring0 address to (since that is the ring0 address I wanted node 2 to use).

Any ideas what's going on?
are pve-cluster and corosync up and running?

systemctl status pve-cluster corososync


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