Serial-over-LAN sessions dropping in ZRH

时间线

1. 已解决2025年8月8日 19:12 UTC

   Resolved at 19:12 UTC. Duration: 30 minutes. The change that caused this has been added to our pre-change checklist.

2. 观察中2025年8月8日 19:06 UTC

   Sessions now stay up. Watching for 6 minutes.

3. 已确定原因2025年8月8日 18:50 UTC

   An idle-timeout change on the management firewall is closing the UDP flows that SOL uses. The timeout has been raised back.

4. 调查中2025年8月8日 18:44 UTC

   Serial-over-LAN console sessions in ZRH are being dropped after a few seconds since 18:42 UTC. KVM sessions are fine.