Login attempt failed My Drupal 6 site's login function stopped working all of a sudden, with no error other than "login attempt failed".


No database table crash
Cookie domain is not set
Drupal runs in "single-site" mode, not "multi-site"


The copy of the site runs well on my local machine.
Do you have any advice?
Now I found the cause: The "pass" field in "users" table by some accident was set as 32 chars long, which is far less than required by phpass module (128 chars long).
I re-installed phpass to make the table change as required and fixed the problem.