Apache 2 basic authentication problem with some browser

[raskar]

Hi,

I have configured an Apache 2 virtualhost to be accessible only with the basic authentication.

<Directory /path>
AuthType Basic
AuthName "You need to be connected"
AuthUserFile /usr/local/apache2/conf/passfile
Require user specifieduser
</directory>

This settings work great, but I have a problem that occur with some user.
When they access a page, the browser asks to identify multiple times to show the page, around 6-7.
My client runs on Ubuntu jaunty width firefox 3 and I don't have this problem.
Some windows users have it and others not.
It appear that most Mac OS X users have this problem, Safari and Firefox.

Do you know a known issue and maybe a solution ?