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Recent Information

Recent Information

On this website you will find all information about the current developments and measures concerning the disturbances of our teaching and learning platform RWTHmoodle and the integrated streaming server Opencast.

As a result of the measures taken, it was possible to successfully stabilize RWTHmoodle and Opencast. This information page will remain available to you for the time being.



Twitter Service-Ticker

You can find information about current disturbances with RWTHmoodle and the streaming server Opencast on the following page:





Workarounds for users

Here you can find suggestions on how to deal with the effects of the disturbances (workarounds). We are continuously expanding this list.

Instructions for extending deadlines for assignments

Instructions for solving problems with quizzes caused by the disturbances. For example, deleting individual attempts, granting additional attempts, or extending the test closure date (for individual persons) (Currently only available in German)

Alternative login to the serious game "Transaction" in case of a RWTHmoodle disturbance

Alternative login to Dynexite in case of a RWTHmoodle distrubance 


Long response times for editing in RWTHmoodle

Due to higher system load, longer response times may occur in the course rooms during processing. If you continue working in the course room during the waiting time (e.g. second tab), the following error message may be displayed: "error/Unable to obtain session lock". Workaround at this point is to use another browser or a private session in the browser.


Measures before and at the beginning of the winter semester 2020/21

  • Increase of hardware resources for RWTHmoodle:
    • Technical equipment at the beginning of the winter semester 2020/21:
      • Webserver: 4 Server with 8 Cores and 8GB RAM
      • Databases:
        • 1 Master with 14 Cores and 24 GB RAM
        • 4 Slaves with 8 Cores and 24 GB RAM
    • Expansion of technical equipment in calendar week 46:
      • Webserver: 4 Server with 14 Cores and 32 GB RAM
      • Databases:
        • 1 Master with 14 Cores and 24 GB RAM
        • 4 Slaves with 14 Cores and 24 GB RAM
    • Further expansions are planned
  • Adaptation and optimization of databases
  • Further development and scaling concept for the streaming infrastructure
  • Intensified and short-term communication via online channels (e.g. "service ticker" on IT Center Twitter channel)

Additional measures in consequence of the disturbances since the beginning of the lectures

  • From 10 November 2020: Establishment of an internal Moodle crisis team under the direction of the managing director of the IT Center and with active participation of CLS

Technical measures:

  • CPU extension of the database systems
  • Extension of the main memory of the database servers from 24 to 48 GB
  • Extension of the file server's main memory from 4 to 6 GB
  • Stepwise increase of the "max_connections" limit within the database
  • Fix of a problematic plugin (mod_orgazizer)
  • Local hard disk extension of individual components of the streaming server Opencast and the RWTHmoodle web frontends
  • Successive increase of web server processes on the RWTHmoodle web frontend
  • Extension of the number of RWTHmoodle web frontends from 4 to 10
  • Continuous analysis of occurring malfunctions
  • Implementation of the enterprise monitor to improve the analysis of database activities
  • Activation of the Redis Session Cache 

Communication measures:

  • Establishment of an information page on IT Center Help (
  • Proactive, bilingual communication regarding the current situation of RWTHmoodle and Opencast with all relevant user groups 
  • Publishing of hints to the new information page in RWTHmoodle: Start page, dashboard and once when entering a learning room 
  • Bilingual maintenance and error messages for RWTHmoodle with detailed explanations of the effects 
  • Writing instructions on how to proceed in case of disturbances for the course room managers with active e-tests and tasks 
  • Informing the learning room managers with active e-tests in case of a malfunctions with the above instructions in order to be able to react to any possible effects of the disruption 
  • Notifying the AStA and third-party system providers in the case of a malfunctions 
  • Announcement of upcoming, unscheduled maintenance by e-mail to course room managers, learning room supervisors and AStA
  • Active telephone contact of affected course room managers regarding the deletion of failed and pending videos to relieve Opencast 
  • Intensified and short-term communication via online channels ("service ticker" on IT Center Twitter channel, news, Facebook) to inform other target groups 
  • Further adaptation and extension of the RWTHmoodle documentation to IT Center Help



Dear users of RWTHmoodle,

In the last few days there have been more and more distrubances of our teaching and learning platform RWTHmoodle and the integrated streaming server Opencast.

We are aware of the importance of a reliable and high-performance learning infrastructure in the current semester at RWTH Aachen University.

We would therefore like to inform you about the current status of the analysis of the faults that have occurred and what measures have been taken to rectify them.

Due to extended page loading times and partly failed database accesses, we optimised the RWTHmoodle database at the beginning of the semester and significantly extended the system by adding additional CPUs, cores, and memory. A further expansion of the system is currently in preparation. This is intended to absorb possible load peaks caused by the strong increase in usage. However, the analyses carried out so far and the resulting measures have not yet led to the complete exclusion of potential problems.

The concrete measures we have taken as well as those planned are listed again at the bottom of this page.

Due to the urgency and the far-reaching consequences for teaching at RWTH Aachen University, the IT Center has therefore set up a Moodle crisis team together with the Center for Teaching and Learning Services (CLS). The Moodle crisis team is now coordinating all analyses, the measures to be taken, and communication throughout the university.

The whole team is working intensively to improve the situation and would like to apologise for any inconvenience caused to you by the disturbances of RWTHmoodle.

Please feel free to contact us for any further questions at


IT Center of the RWTH Aachen University



    Further information about RWTHmoodle:

    Upload videos on the RWTH streaming server (Opencast)

    Embedding videos from the RWTH streaming server (Opencast)

    Upload video files

    Status message portal of the IT Center

    last changed on 02.02.2021

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