Original request description:
Support NTLM authentication instead of password login when appropriate. This is attractive, even more as Mozilla 1.4 supports it.
Customers have reported in past comments like this one or this one that they were successful once they installed Cntlm Authentication Proxy locally to their JIRA server, configured and tested it to make sure "Cntlm" works with their corporate NTLM and then used the parameters documented in How to Configure an Outbound HTTP and HTTPS Proxy for JIRA to point to the "Cntlm" proxy instead - and that one will do the job to talk to NTLM.
More detailed steps can be found on How to Configure an Outbound HTTP and HTTPS Proxy for JIRA.