Oh man I done it again. After going through all the procedures for enabling facebook authentication. I tried it and it appeared to work but I have it set up as needing approval so it emailed me. I went to log in as admin to approve and change this setting and the worst when you try to log in as admin or host it just blinks and say this in red below "A critical error has occurred. An unexpected error has occurred" It's DNN7 and I have complete access to the remote host machine but what can I try I'm lost.

try browsing to mysite.com/login.aspx. If that doesn't work, try mysite.com/default.aspx?ctl=logoff.

If neither of those things work ... let me know and I'll try to find something else.

One thing that you do is get into the database with sql server and look in the eventlog table for the most recent entries. You can copy the text of the error and it will provide more details.