It's actually impossible to run Traq in secure mode via https://
If I enable https://, all the query and links in traq have an https:// url but it looks like there is a redirection to a non https:// mode
Where does this redirection from https to http take place?
When clicking the link(s) or during form submission?
After checking again, I founded that the problem only occurs in Safari on my mac. The problem is not a redirection but a not completely safe connection through https:// due to news plugin not using an https:// connection (http://traq.io/news.json).
[Warning] The page at https://**** ran insecure content from http://traq.io/news.json?callback=jQuery1110034150170045904815_1397062615646&_=1397062615647.
Ah, yes. I will have to fix that, either by disabling the fetching of news when accessing the AdminCP via https or setting up https on Traq.io