Error message "Please check the network." when sending links via e-mail

That is part of the mystery:

  • No error message in seahub.log - like in the past.
  • No error message in the browser console, by contrast, I see a 200 status (see below)
  • Identical behavior in Firefox and Chrome
  • I tested in a Docker-based system and non-Docker system

I will send you log in credentials for the test system (Docker) in a private message.