IONOS Cloud incident

Increased Error Rate on S3 Cloudian

Resolved after 4 days 5 hours, affecting Object Storage, on November 6, 2025.

resolved Nov 10, 2025, 04:48 PM UTC

We want to share the following Root Cause Analysis: What happened: On the 6th of November, our Monitoring Team alerted us to increased error rates for requests to S3 Cloudian in DE/FRA. The increased error rate was caused by a network-level issue related to MTU settings lower than standard, causing intermittent issues for some connections. What we are doing to prevent this from happening again: On 11.11.2025, a fix will be rolled out to the affected network, which will correct the MTU settings permanently.

Started
Nov 06, 2025, 11:14 AM UTC
Resolved
Nov 10, 2025, 04:48 PM UTC
Duration
4d 5h
Detected by Pingoru
Nov 06, 2025, 11:14 AM UTC

Affected components

Object Storage

Update timeline

  1. investigating Nov 06, 2025, 11:14 AM UTC

    We are currently investigating an increased error rate for requests to S3 Cloudian in DE/FRA.

  2. monitoring Nov 06, 2025, 12:14 PM UTC

    Error rate has dropped. We are closely monitoring the situation. We are compiling a root cause analysis.

  3. resolved Nov 10, 2025, 04:48 PM UTC

    We want to share the following Root Cause Analysis: What happened: On the 6th of November, our Monitoring Team alerted us to increased error rates for requests to S3 Cloudian in DE/FRA. The increased error rate was caused by a network-level issue related to MTU settings lower than standard, causing intermittent issues for some connections. What we are doing to prevent this from happening again: On 11.11.2025, a fix will be rolled out to the affected network, which will correct the MTU settings permanently.

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