Cannot delete ghost node

Hello,
We have 3 servers in cluster. We had a problem adding a 4th server (it stayed in the "Waiting for quorum" status)...after rebooting all servers and disconnecting the last server we could gain access to the cluster again.
The problem now is that we have a ghost node with the "Estranged" status...what does it mean?, how can we delete that node? (it does not exist in any cluster.conf)
All nodes have the same and latest version (2.3/7946f1f1).

This is the summary screen: (the node that never joined the cluster was named proxmox2-5)

pm2-0.png

Any ideas will be appreciated...

Thanks in advance

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