Server 2019 – UDP Port 3343

Morning all,

We’ve recently trialled an in-place upgrade of our Cluster servers from 2016 to 2019 Datacenter edition. It all went very smooth and everything seemed to be working.

However - a week later and suddenly the cluster is failing.

A validation report shows that the three nodes cannot talk to each other on any network via UDP Port 3343.

I’ve opened the necessary ports on the firewall - but it’s still happening.

It is generating a lot of errors (some critical) in the event log for Failover Cluster Manager.

I’d be grateful if anyone could help or offer advice.



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