This ISP didn't use NAT for https, and here comes the problem, if you're connected with that ISP you may present a different IP to a webserver if you use single http or https, 'cause you IP it's being translated by NAT on http and don't on https. Yes! two differents IP for a single machine...
If you're a ISP customer may you don't feel this as an error, but if you're webmaster -as I 'm- you go crazy following sessions with two diffrents IP's. .. damn ISP. It's so difficult use NAT for everything ? or didn't at all?
I'm using NAT at home, for my internal LAN -over all protocols used- and goes fine. Yes, I know it's no the same, but again:
- It's so difficult use NAT for everything ? or didn't at all?