How To Fix SLDAP_ICM013 - STARTTLS negotiation with directory service "&1" results in error &2&3&4

SAP Error Message - Details

• Message type: E = Error

• Message class: SLDAP_ICM - ICM LDAP Plugin: Messages

• Message number: 013

• Message text: STARTTLS negotiation with directory service "&1" results in error &2&3&4

What causes this issue?

The ICM LDAP plug-in has successfully established a connection to the
directory service, but the STARTTLS negotiation to promote the
connection from unencrypted to secure communication failed.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

With the help of the provided error information, the error eventually
can be solved. Typically, the server's certificate is not in the own
systems trust list.

Procedure for System Administrators

In the maintenance of LDAP Servers in the SAP system, the button
"Connection Test" can be used to validate the correctness of the current
connection data for a directory service. This button might reveal a
longer error message than available at other locations.

Error message extract from SAP system. Copyright SAP SE.