To troubleshoot issues related to LDAP connection, we will use Wireshark to capture the traffic data.
Download WireShark (64bit version) from https://www.wireshark.org/download.html.
Install it on the DualShield server (follow its user guide).
Run it as Administrator
Use the capture filter "tcp port 389", as we only care about the LDAP traffic on port 389.
Press "Enter" key to start the capture.
Alternatively, You can add the filter into template with Capture | Capture Filters...
Click + button to add a new one
(double click the fields to change their values)
You can see the current options, Capture | Options...