I have Kerberos authentication working flawlessly at tyhe command line of a CentOS4 server. However, apache2 seems totally unaware of it. Here's a snip0 from httpd.conf: LoadModule auth_kerb_module modules/mod_auth_kerb.so Code (markup): and here's an .htaccess file on a protected directory: AuthName "Kerberos Login" AuthType KerberosV5 Krb5Keytab /var/www/auth_kerb.keytab KrbAuthRealm MYDOMAIN.COM KrbMethodNegotiate on KrbMethodK5Passwd on KrbSaveCredentials off KrbVerifyKDC off Require user MYDOMAIN\myusername Code (markup): I get served up a 401 page, never a challenge for a username/password. No error log notes, this from access.log: 10.30.150.60 - - [04/Jun/2010:08:08:04 -0500] "GET /test HTTP/1.1" 401 472 "-" "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.3) Gecko/20100423 Ubuntu/10.04 (lucid) Firefox/3.6.3 GTB7.0" Code (markup): It appears to me that apache is unaware of kerberos, even though the module successfully loads. Any idea what to try next?