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Old 02-09-2010, 07:55 PM
Junior Member
  
Join Date: Nov 2006
Location: Between Germany and Austria ;-)
Posts: 24
Angry AD based address verification broken with LDAPS?
Hi,

we use MS AD based LDAP user authentication for the auad since ages.

Port 636 with LDAPS is used, testing works fine and the users can login to user portal without any problems.

Because we recently changed from MS Exchange 2003 to 2010 and the SMTP based e-mail address verification ("callout") does not work anymore (at least our Exchange admin does not know how to switch it on again... >:->>) I decided to use "Acitve Directory based recipient verfication" using the configured LDAP server.

I was surpised to see messages like

temporarily rejected RCPT <blablub12345@google.com>: failed to bind the LDAP connection to server 10.23.60.99:636 - ldap_bind() returned -1

in the SMTP log.

At the very same moment I saw successfull logins in the auad.log. Strange!

I decided to switch from LDAPS (636) to LDAP(389) and voila no SMTP error log entires anymore.

Looks like we have a problem with LDAPS in the SMTP-proxy?

Anybody who can confirm this?
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Regards,

Holger
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