Within Apache2 configuration files (mine are /etc/apache2/sites-available/example).
If you use a ServerName value with underscore characters or capitalization you will get one of two errors:
- "There seems to be a problem with your login session; this action has been canceled as a precaution against session hijacking. Go back to the previous page, reload that page and then try again"
This will occur when trying to login as any user, even with a session.save_path value explicitly set in LocalSetttings.php.
This only occurs in IE 8 and 9 (did not test older versions)
I also tested with Firefox 9.01 and Google Chrome 16.0.912.77, both of these browsers worked with login.