Hetzner incident

Technical issues with vSwitch MAC learning

Resolved after 1 day 12 hours, affecting Network (vSwitch), on October 19, 2026.

investigating Oct 20, 2026, 08:43 PM UTC

MAC address information may not be installed correctly after MAC updates on some network devices. As a result, MAC learning within a vSwitch can be delayed, and ARP/NDP requests may go unanswered, which can lead to packet loss between servers in the same vSwitch. We are aware of the impact and are working on it with high priority.

Started
Oct 19, 2026, 07:00 PM UTC
Resolved
Oct 21, 2026, 07:37 AM UTC
Duration
1d 12h
Detected by Pingoru
Oct 19, 2026, 07:00 PM UTC

Affected components

Network (vSwitch)

Update timeline

  1. investigating Oct 20, 2026, 12:25 AM UTC

    Delays in MAC learning within the vSwitch may occur. This can lead to packet loss if ARP/NDP requests are not answered in a timely manner.

  2. investigating Oct 20, 2026, 08:43 PM UTC

    MAC address information may not be installed correctly after MAC updates on some network devices. As a result, MAC learning within a vSwitch can be delayed, and ARP/NDP requests may go unanswered, which can lead to packet loss between servers in the same vSwitch. We are aware of the impact and are working on it with high priority.

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