Jira Service Desk -- Limit access

[Casey Daniell]

Problem

I support many companies that are all under one holding group, however, we don't share a common network infrastructure, but want users to file tickets into our Jira Service Desk instance.  

We can't provision accounts for all users that *may* file tickets into Service Desk, so we allow users to generate an account on the Customer Portal to submit tickets, which works for users on our network, but users in other companies that are on seperate networks can't access the portal.

Question

Without putting Jira Service Desk on the internet for general public to access this system, how can I restrict who can see the Jira Service Desk Customer Portal to employees, contractors, or approved users only? 

[Casey Daniell]

I went to an AUG meeting this morning and one of the attendees mentioned this request, https://jira.atlassian.com/browse/JSDSERVER-868, which would solve my issue. Is there an alternative to waiting another 5 years, ticket was opened Sept 25, 2014, for Atlassian to implement this necessary feature?