Hello. I have a virtual host configured with a location set to use auth_form: <Location /munin> #DirectorySlash Off AuthFormProvider file ErrorDocument 401 /login.shtml AuthUserFile /etc/apache2/.htpasswd AuthType form AuthName Munin #AuthFormLoginRequiredLocation http://xenbeere.de/login.html Session On SessionCookieName session path=/ # SessionCryptoPassphrase secret Require valid-user </Location> When i go to http://host/munin everything works fine. Auth form needs to filled in and after that the page shows up. But if i use hhtp://host/munin/ (note the trailing slash) the auth form shows up and after entering the credentials "Internal Server Error" is shown. The log says: [Thu Mar 29 16:12:35.665238 2012] [core:error] [pid 5422:tid 140602179712768] [client xxx.xxx.xxx.xxx:58670] AH00027: Buggy authn provider failed to set user for /munin/index.html.var, referer: http://host/munin/ Even weirder. If i set this authenticator in .htaccess everything is working fine. Any hints? Do i something stupid again? best regards t.