The LDAP check is a little bit special-cased by default. Openldap's API for bind checking tends to hang if the service is down, so it's checked via a TCP hit first.
Looking through my records, this patch from Terabithia wasn't upstreamed yet due to its changing of the default behavior, but I think it might be the actual root of this problem. (Honestly, I haven't altered an LDAP check in a while, so I might be remembering things wrong.) Would you mind trying it out?
-jc
Sure, send it over.
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