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Everything is running, it's just not responding to pings. Our monitoring polls by pinging, so it thinks the XenServer is down currently.

I think I have seen this, what version did you come from?

12.1-54.13

this may not be right but got 2 DNS servers set?

only 1

Did you check if XS is still reachable via SSH? If not appliance accessibility could be the reason. Not sure which version brought this setting.

Try adding a second DNS to XS via the SVM

Please enable the setting „Appliance Supportability IP Address“ and try to ping again.

Thank you, that was it. The firmware upgrade had removed Appliance Supportability configuration.