On my iPhone:
Safari asked permission to override security once, and remembers this on future visits.
Chrome splashes a warning, lets me override it; doesn't remember it in future sessions, so I have to do it each time I go to the site. It doesn't have a problem moving between pages on the site, once you're there.
- Firefox... The version on my iPhone tries to go to the site, briefly throws up a warning page, then reverts back to its "new tab" screen - and it won't stay on the warning page long enough to even read it, much less follow any link it may be showing. I define this as a bug in Firefox; I'm fine with it throwing up a warning, but it shouldn't be denying me access to that warning page and exceptions.
On my Mac:
- Safari asked once if I wanted to exclude the site from security check, and now it's fine.
- Firefox - ditto.
- Chrome - I can go through "Advanced" to get to the home page, but every time I try to navigate to another page on the site, it blocks it again. [EDIT: I have been able to get Chrome on the Mac to cooperate - but I had to dig into Chrome's advanced settings, and then into the Mac's Keychain, and change the default settings on the Certificate that expired yesterday - I've told it to "Always Trust" the site. It works for me - but I don't think I can recommend that others try this, unless you really know what you're doing.]
So... On the Mac, use Firefox or Safari. On the iPhone, use Safari.
I have no ability to test Windows at this point. If we're still having issues on Tuesday, and if I have time then, I may be able to test and update this.)