Hi
Thanks for the reply. I tried again today, but the issue still persists, even with all other plugins disabled in troubleshoot mode and with different themes (also the default themes). Everytime I go to the “Login Security”, the screen is grey. It is exactly as when you open the other pages for the first time and you get this message with tips, but here this message doesn’t show, so I can’t continue.
Here is a link to the console message, hopefully it works this time: https://postimg.cc/nXPmGN5P
When logging in today, I again received the 503 message from earlier on, so I had to manually remove and install Wordfence again. This also didn’t fix the problem.
Thanks for helping!
Jan