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I am setting up OPNsense 15.7.18_1-amd64 (OpenSSL) hosted on ESXi-5.5.0. I am trying to set up an LDAP authentication server against a local Active Directory domain controller. When I click the Select button in the Containers section, I get the informative message: "Could not connect to the LDAP server. Please check your LDAP configuration."

So, my main question is, how in the world do I troubleshoot this? Are there any log files or other tests that could give me more information?