AuthType basic AuthName "University of Maryland Directory ID" AuthBasicProvider ldap AuthLDAPURL ldaps://directory.umd.edu/dc=umd,dc=edu AuthzLDAPAuthoritative on Require valid-user ErrorDocument 500 /errors/gradreview500.html
1b) If you want to restrict use to specific ldap users then create a file /fs/www/path/to/webdir/.htaccess containing the following...
AuthType basic AuthName "University of Maryland Directory ID" AuthBasicProvider ldap AuthLDAPURL ldaps://directory.umd.edu/dc=umd,dc=edu AuthzLDAPAuthoritative on Require ldap-user username1 username2 username3....usernameN ErrorDocument 500 /errors/gradreview500.html
Note, .htaccess files affect the directory which contains them and all subdirectories. This is usually desired behavior, but be aware of it. If you want different behavior somewhere lower in the directory tree, you will need to create another .htpasswd to override the one above it.