Hello Michael,
>>
>> freeRADIUS works quite good and it's possible to authenticate via PAM,
>> for example local logins, ssh-logins, su, chsh, gdm, ... are working
>> quite fine.
>>
>> The only thing is the htaccess from apache2 which will not work. The
>> Radius gets the request and permits the user:
>
> I would suggest finding out why Apache is requiring more from PAM than
> everyone else does. It's not really a pam_radius problem, because it
> works with everything else.
>
we had similar problems with radius and Apache2 (it is not a RADIUS/PAM
problem!) PAM didn't work for us neither, so a colleague found another
radius module for Apache 2:
http://www.outoforder.cc/projects/apache/mod_auth_xradius/
But it only works with Apache 2.0.x. With Apache 2.2.x we didn't manage
to get any radius authentication working.