RWTHmoodle

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Playback errors with embedded YouTube videos (Apple devices only)

Notice
Thu 04/23/2026 03:00 PM - Fri 10/23/2026 12:02 PM

Currently, YouTube videos that have been embedded using H5P activity display ‘Error 153’. The error occurs on Apple devices only but is in relation to the used device and browser. The problem applies to the newest version as well as older ones.

30.10.2025 15:36
Updates

YouTube videos embedded in H5P content currently have limited functionality on Apple devices using the common browsers Firefox, Chrome, and Safari. On macOS, they can be played in Chrome and Firefox, but in Safari, error 153 appears instead of the video. On iOS and iPadOS, error 153 appears in Safari, Firefox, and Chrome.
The cause is a bug in WebKit-based browsers combined with a change in the guidelines for the embedded YouTube player. Unfortunately, there is currently neither a fix for the bug nor a solution from Moodle or H5P. As a workaround, please use a browser other than Safari and a device other than an iPhone or iPad on macOS.

23.04.2026 12:00

Recently expired reports

Proxy - SW-Update

Maintenance
Tue 09/01/2026 11:00 AM - Tue 09/01/2026 12:00 PM

In the course of a software update, the individual proxies are restarted. Due to the HA implementation, there should be no failures. Affected are among others mail, WLAN VPN/Shibboleth (because of LDAP).

01.09.2026 09:17

MySQL Database Server Maintenance - MFA Restricted

Maintenance
Tue 08/25/2026 07:00 AM - Tue 08/25/2026 07:30 AM

During the specified maintenance window, the IT Center will perform maintenance on the MySQL databases used by the Multi-Factor Authentication (MFA) service. As part of the maintenance, the databases will be unavailable for a total of approximately 15 minutes.

During this time, new logins to services using RWTH Single Sign-On will not be possible. Existing sessions will remain active and will not be affected by the maintenance.

10.08.2026 14:47

Storage System Maintenance

Partial Maintenance
Thu 08/20/2026 12:00 PM - Thu 08/20/2026 01:22 PM

Due to maintenance work on the storage system (Ceph Storage), the following applications will experience disruptions during the maintenance window:

  • RWTHonline: Documents cannot be uploaded or downloaded in the “Submission of Final Theses” application. You should also complete any file uploads before the maintenance window begins to avoid errors.
  • RWTHmoodle: Playing and editing existing videos, as well as uploading new videos, will not be possible. This only affects videos made available via the “Opencast” streaming application.
  • Lecture Hall Streaming: Streaming videos from the lecture halls will not be possible.
  • GitLab: Uploads (and downloads) of user files and images, CI/CD pipelines, artifacts and registries, and LFS will not be available. Backups will also not be possible.
  • Linux Installation Server: The provision of Linux RPM packages and Kickstart files will be affected during the maintenance period.
  • GigaMove: Uploading and downloading files will not be possible.
07.08.2026 12:04
Updates

Die Wartung ist nun erfolgreich abgeschlossen.

20.08.2026 13:22