Securing EJB with legacy ldap realm does not work on EAP 7.3

Solution Verified - Updated -

Issue

While calling a remote EJB from the ejb client application using picketbox we are getting below error in the server log. Then the the client application get timed out.

Caused by: java.lang.ClassNotFoundException: com.sun.jndi.ldap.LdapCtxFactory from [Module "org.wildfly.extension.io" version 10.1.20.Final-redhat-00001 from local module loader @5f2108b5]

Please note that the setup is working fine with JBoss EAP 7.2.8.GA So we think there is no issue with configuration.
We have also found one ticket which may related with this issue.
https://issues.redhat.com/browse/WFCORE-3884

Environment

Red Hat JBoss Enterprise Application Platform (EAP) 7.3

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