ExacqVision Server software is not supporting the AES encryption method in the connection with LDAP earlier than version 21.12.6
If you are using an earlier version of the ExacqVision Server, you will be able to communicate with LDAP using the RC4 encryption method only
To determine if you are using the AES encryption or not.
Check the logs from Exacq server for the StreamPi plugin, and if you are using the AES encryption and the Server is not able to decode it then it would show you these logs
StreamPI Warning Encryption type: aes-cts-256-sha1-96 (occurs 58811 times)
StreamPI Warning Unable to decode encrypted ticket (occurs 33140 times)
StreamPI Warning Unable to decode encrypted element (occurs 22007 times)
Another method to check
From the Active directory in the DC, go to the binding user and right-click on it then properties, then navigate to the Account tab
If you are using the AES encryption, then you should have the AES 128 or AES 256 or both checked