Two questions:
1: My RB951G, keeps logging me off when I manage it via Webfig.
Can´t say Why, What can I check if it is working wrong?
2: I accidentally deleted the user admin, (I miss the little icon, and i touched remove), with so bad luck the in that very moment, the rb logged me off.
Quiestion is: restoring the last back up, brings the user admin alive? (the new user to access has only write permissions).
If you have a backup saved (on the device or elsewhere), resetting it to factory defaults will re-create the admin user with default (no) password and not delete the backup file if it is on flash.
Once you set a new password for the admin user (or, better, add some other users with less well-known names and group=full, log in as one of them and disable user admin), you can restore the configuration from the backup.