I am getting the following two errors when trying to connect to broker.
Have you looked at http://answers.splunk.com/answers/40255/does-splunk-for-netwitness-support-ssl-access-to-the-rest-ap... ?
Is this solved by now?
Also some of the newer releases should start to include a fix in the code itself, so an upgrade to the latest build of the app, if that's not the one being used may help.
Finally, unfortunately the hack on the link above will need to be performed also after each upgrade as the Splunk upgrade will change the library back.
Hope these help!