Incident Library
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  1. IL-0349 IONOS Private Cloud in Berlin lost management access, storage and VM internet routing after a VLAN change
    IONOS Cloud2026
    Symptoms

    On 15 January 2026, network services for VMware-based Private Clouds in IONOS Cloud's Berlin location stopped working: customers lost management VPN access and traffic to and from their virtual machines. Inside IONOS, several management interfaces in the Berlin region could no longer be reached.

    Network unreachableStorage disconnected or stale mounts
    Trigger

    During a planned maintenance window to add a new VLAN to the management devices, a human error in the command replaced the existing VLANs on the trunk between the core and management devices instead of adding to them, so only the new VLAN stayed active.

    Root cause
    Operator error
    Component
    Network switchTransit gateway or network interconnect
    Contributing factor
    Excessive blast radiusNo safeguard on destructive change
    Remediation
    • Restarted the affected storage services in the final stage of recovery, which caused a brief second outage
    Action items
    • Audit the management device architecture to segment it better (target Q3 2026)
    • Evaluate and implement ways to prevent unintended VLAN changes, such as improved configuration safeguards or automation scripts (target Q1 2026)
    View case
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This case involves Transit gateway or network interconnect and Network switch. kubegap audits a Kubernetes cluster for gaps like these, read-only, from Claude Code or Codex; its checks cite public reports like the ones in this library.

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By root cause1

Operator error1 case

Component
Transit gateway or network interconnectNetwork switch
Contributing factor
Excessive blast radiusNo safeguard on destructive change
Organisation
IONOS Cloud
  1. IL-0349 IONOS Private Cloud in Berlin lost management access, storage and VM internet routing after a VLAN change
    IONOS Cloud2026