I have enabled HTTPS with no certificate.

Bazzababes1

I can no longer access osTicket to disable this option. Is their a config file I could edit via ssh which will revert this change?

ntozier

How did you "I have enabled HTTPS with no certificate."?

IF you changed the HelpDesk URL in the UI then you can change it at the database level.
UPDATE ost_config SET value='http://helpdesk.url.tld' WHERE key='helpdesk_url';

note: change 'http://helpdesk.url.tld' to your actual url.