Hi Bob,
1. add "Dependencies: org.jboss.remote-naming" to META-INF/manifest.mf of your .WAR file. This will load org.jboss.remote-naming module and eliminate "Failed instantiate InitialContextFactory" exception.
2. do not use (remove) property "jboss.naming.client.ejb.context": true from jndi map
instead of this, make jboss-ejb-client.properties file and place it to WEB-INF folder vs content like this:
remote.connectionprovider.create.options.org.xnio.Options.SSL_ENABLED=false
remote.connections=default
remote.connection.default.host=your host
remote.connection.default.port=your port
remote.connection.default.username=you user
remote.connection.default.password=you password
remote.connection.default.connect.options.org.xnio.Options.SASL_POLICY_NOANONYMOUS=false
https://docs.jboss.org/author/display/AS71/Class+Loading+in+AS7
https://docs.jboss.org/author/display/AS71/EJB+invocations+from+a+remote+client+using+JNDI
Good luck!