Permalink and basic authorisation

Hi,

I wanted to secure the wp-admin and added basic authentication. This works fine until I’ve setup permalink. It seems that the standard rewrite rules doesn’t understand basic authentication (and the http 401 code) and rewrite any wp-admin request to the server root.
Which rewriterule should I add in order that wp-admin requests will end in the classic basic authentication (popup) and I can access wp-admin?

Eddy