Not redirected correctly when site is in maintenance mode

Hello,

Problem desciption
When you put your site in mainenance mode and get logged out, you can not log in again when duo security is active. Even if you log in (with admin user that can acces the site in maintence mode) and approve the login request you only see the page that the site is under maintenance mode.

Workarround
Force your site to turn off mainenance mode in your /sites/default/settings,php by adding this line:

$conf['maintenance_mode'] = FALSE;

When you are back in you can delete the line.

Suggestion
It would be easier for the user if you could still log in with users that you have approved for access when the site is in maintenace mode.

/Martin