problem with password protected directory

I have my admin directory password protected, but vbseo is causing my admin panel access to redirect to the homepage when I access from any other IP external of my allowed IP.

My htaccess file is this:

AuthType Basic
AuthName "Somename"
AuthUserFile "/home/username/.htpasswds/public_html/custom-admin-directory/passwd"
require valid-user
Order allow,deny
Allow from xxx.xxx.222.2
Satisfy any

If you have restricted access to your admincp folder using .htaccess (Auth directives), please check your apache configuration: having "ErrorDocument 401 401.shtml" directive in httpd.conf requires that "401.shtml" file exists. You should create one if it doesn't to solve the problem.