The server has lost all network connectivity after we had to reboot it since it became unresponsive.
We are following up with the datacenter now to get this fixed as soon as possible.
[08:12 UTC] On further investigation, we found that the disk being read-only was the cause of the server losing network connectivity so we have
rebooted it into rescue and started a fsck.
[08:22 UTC] The server is back after the fsck and OK now.