So I put
http://192.168.1.1 into the address bar in Safari 6.0.5 to log into a router that I need to configure at work. I get back: "Safari can't open the page "https://192.168.1.1"
No wonder, this router is not listening on 443.
It seems that if you ever go to a secure IP address, Safari forces https the next time you enter the same IP in the address bar.
Any way around this (beside: "stop using Safari.")?