Apache 2.0 -> 2.2 LDAP Changes on Ubuntu

I thought the following might be of use to those of you who are still using Apache 2.0 with LDAP and wish to upgrade to 2.2. I found this basic information around online, but I had to search pretty hard for it. Perhaps presenting this in a more straightforward way might help the next searcher to find an answer more quickly. It's probably only of interest if you are using LDAP as your authentication system with an older Apache (e.g., 2.0) and have upgraded to 2.2 on an Ubuntu or Debian system (such as upgrading from dapper to gutsy.)

When running dapper on my intranet web server with Apache 2.0.55-4ubuntu2.2, I had something like this:

     <Directory /var/www/intranet>
           Order allow,deny
           Allow from 192.168.1.0/24 

           Satisfy All
           AuthLDAPEnabled on
           AuthType Basic
           AuthName "Example.Org Intranet"
           AuthLDAPAuthoritative on
           AuthLDAPBindDN uid=apache,ou=roles,dc=example,dc=org
           AuthLDAPBindPassword APACHE_BIND_ACCT_PW
           AuthLDAPURL ldap://127.0.0.1/ou=staff,ou=people,dc=example,dc=org?cn
           AuthLDAPGroupAttributeIsDN off
           AuthLDAPGroupAttribute memberUid

           require valid-user
    </Directory>

I upgraded that server to gutsy (via dapper → edgy → feisty → gutsy in succession, just because it's safer), and it now has Apache 2.2.4-3build1. The methods to do LDAP authentication is a bit more straightforward now, but it does require this change:

    <Directory /var/www/intranet>
        Order allow,deny
        Allow from 192.168.1.0/24 

        AuthType Basic
        AuthName "Example.Org Intranet"
        AuthBasicProvider ldap
        AuthzLDAPAuthoritative on
        AuthLDAPBindDN uid=apache,ou=roles,dc=example,dc=org
        AuthLDAPBindPassword APACHE_BIND_ACCT_PW
        AuthLDAPURL ldap://127.0.0.1/ou=staff,ou=people,dc=example,dc=org

        require valid-user
        Satisfy all
    </Directory>

However, this wasn't enough. When I set this up, I got rather strange error messages such as:

[error] [client MYIP] GROUP: USERNAME not in required group(s).

I found somewhere online (I've now lost the link!) that you couldn't have standard pam auth competing with the LDAP authentication. This seemed strange to me, since I've told it I want the authentication provided by LDAP, but anyway, doing the following on the system:

a2dismod auth_pam
a2dismod auth_sys_group

solved the problem. I decided to move on rather than dig deeper into the true reasons. Sometimes, administration life is actually better with a mystery about.