I am on Firefox and periodically I cannot login to the webgui on the same browser until I do a full cache/cookie clean. It just returns to the login site (no error message).
I have the plugin "autoclean" and its rules are bypassed for localhost but using its inbuilt cleaning tools (cache, localstorage etc) does not fix the problem of being unable to login - which seems strange. If I open a private browser or do a complete cache/cookie clean then I can log in again.
I have tried looking in the system log files to see if any error messages appear but cannot find anything. There's is nothing in the browser console either that suggests what the problem might be.
This happens all the time across my different devices.