Setting up MediaWiki on a SLES 11 SP3 server. Everything works fine
except I need to authenticate against my LDAP server (which is OES
11). When I try to loginm, I see this error in the log files:

PHP Warning: ldap_start_tls(): Unable to start TLS: Can't contact
LDAP server in
/srv/www/ on
line 203, referer:

The IP address is correctly specified in LdapAuthentication.php. So I
figure it is either a config issue or I need to install something, but
haven't figured it out yet. Any suggestions?