Morning Vincent Apologies for delayed response. Version of the controller during the failure was Omada_SDN_Controller_v5.13.30.8_linux_x64 We've since tried updating to the latest version omada_v6.0.0.25_linux_x64_20251120205747 however this did not resolve. Linux distribution is Ubuntu 20.04.6 LTS The original symptom was the GUI would load but just with a spinning green circle which we identified as a database issue. To try and resolve we backed up /var/lib/mongodb to /var/lib/mongodbbak and created a new mongodb folder with the correct permissions to let MongoDB rebuild. In the process of doing so it appears to have created the DB as a new one with a completely fresh setup but we're hoping that the files within /opt/tplink/EAPController/data/db which weren't changed still contain the data we're looking to bring back in to the DB? Sadly do not have screenshots to share at this time. Many thanks

  @Vincent-TP That guide seems to relate to the GUI of the devices themselves rather than the Network controller.

 

Originally the network controller GUI would open with a spinning green circle. After making the changes mentioned in my last post it then went back to the original setup page that you first see when you setup a brand new controller.

 

Many thanks