Apigee Edge - LDAPSearch failing with ssl handshake using unboundid

[johnwilliams]

@dchiesa1 We are using unboundid (6.0.9) for connecting to LDAP and we are seeing this error when establishing connection to LDAP host,

Ldap search exception occurred An error occurred while attempting to connect to server HOST:636: IOException(LDAPException(resultCode=91 (connect error), errorMessage='An error occurred while attempting to establish a connection to server HOST/IP:636: SSLHandshakeException(Received fatal alert: handshake_failure), ldapSDKVersion=6.0.9, revision=42839ddf0d77d954805fbbe3cce73a792af40474')).

I have added the required certs to Java keystore in the JDK path /lib/security/cacerts.

I wanted to know how can I narrow down the issue or if there is a way to enable debug logs for this ? 

Note: This works in the different environment with same settings. Firewalls are open and tested using openssl commands.