I have an AP900 - and I can browse to it and use it via http - but as soon as I try to use https I firstly get the "certificate not valid" (that's ok - I accept that...) warning, but if I continue it get a 404 "This page can't be displayed".

https isn't blocked across my intranet - and yes, the ap900 is set to use 443 for https. Any suggestions?

I just tried it on mine and IE11 reports that it might be using outdated or unsafe TLS security settings, it cannot connect securely and won't let me continue.

Trying it with an AP902 and Kaspersky Internet Security flags up a warning but if I accept the risk it lets me in.

Never tried this before

Ah - thanks. Just tried with another browser and it was fine - just IE11 not playing with it.