+++ This bug was initially created as a clone of Bug #449738 +++ 99_icinga.conf file: without removed "order deny,allow" it's not working here. Also you need your apache user to be in the icinga group. Otherwise it won't be able to read the AuthUserFile. I'm using apache 2.2.23
the order part is out of it (we are on 1.8.4 now). as far as the apache user thing, earn :D in tree now as 1.8.4-r1