Client says Can't contact LDAP server, but it can!

[John Oliver <joliver@john-oliver.net>]

What can I do to troubleshoot this?  OpenLDAP client says
ldap_simple_bind Can't contact LDAP server but it can resolve the name,
ping the server, connect to port 636... and I have no details as to why
it thinks it cannot contact the server.  Many other clients authenticate
to the same server, and I'm using the same ldap.conf, nsswitch.conf, and
pam.d/system-auth files.

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* John Oliver                             http://www.john-oliver.net/ *
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