I am also having this problem as of this morning. When talking with my hosting provider, they said it looked like the plugin had blacklisted itself? They were going to attempt to whitelist it, not sure how that works, but it is taking a long time and in the meanwhile my client is locked out. I know I have multiple users all accessing the site with a single password, but didn’t think that would be an issue. I get:
405 Not Allowed
nginx/1.8.0
