2021-08-10 17:49 UTC (updated)
note to subscribers: please, reboot your servers tomorrow (or at least in 3-5 hours, not earlier) to load new kernel versions and cleanup iptables rules.
There was an issue with firewall configuration and because of that downtime (< 1 hour) occurred, sorry! To avoid other issues, server reboot is encouraged.
If you face that issue again, please, run following command:
sudo iptables -I DOCKER-USER 1 -j RETURN