[NAME], you have a error code 400 which might mean that the parameters you are passing might be wrong. How are you configuring the integration via the CLI or on the NMC ? not sure but I think this might help - [URL]
Good morning. I get the following error when attempting to create a ne External Authority in Network v19: Creation failed 176230: Unable to add external authentication provider to authentication service. [ErrorMsg: Failed to verify configuration [DOMAIN]: An authentication error has occurred while accessing the naming directory service: [LDAP: error code 49 - 80090308 ldapErr: DSID-0C09044E, comment AcceptSecurityContect errpr, data 52e, v2580], HTTPErrorCode: 400] I am connecting to a W2K12 DC using LDAP over SSL. I can connect using the same credentials and port using the Windows LDP utility which suggests I may need to tweak a setting in networker. Regards    
Create External Authentication Authority: LDAP Error 49