I've changed my ISP recently, for the first days it was working, but now it just stopped reaching HTTPS sites. Gmail works fine since IIRC it changes to regular http when https not available. But anything relating to money and payments does use https nowadays, and I can't use these. I'm trying to purchase an indie bundle with paypal, and the page does not load. I called my ISP and they say they do not block any of the payments sites I did mentioned, that they actually block zero websites.

I can access the paypal's main http website, but nothing past than that so that means no login. I did a ping and tracert, and it fails 100% out of 4 tries and the tracert is stuck without any numbers (other than the defaul 1ms) in it.

Tried IE9 without success. I have ticked all SSL and TLS boxes, disabled certificate revogation too. Work offline is not enabled. Used the compatibility mode and it fails too. I did a reset of all IE settings, and also added paypal to the trusted sites.

Tried the latest Firefox and the latest Chrome, same problem.

Downloaded the microsoft fixit programs, to restore the hosts file, restarted and didn't worked. The latest programs I installed which could potentially mess with my internet settings, were only Origin and Steam updates. Switched from default to OpenDNS, didn't worked too. Windows' built-in firewall is all disabled. No proxies used. Cleaned the registry with two programs before doing all of these.

Help, GOGers?

EDIT: I forgot to mark this as a question. =/

sounds like there could be malware or one of your anti-virus malware blocking programs is to blame... possible your system got setup to use a proxy without you known and your browsers are defaulting to that connection?

check your connection settings, make sure no proxies or vpns are setup...
check that all definitions and updates are on all scanners or remove a few and weed down your apps, try to get one firewall and one anti-virus or find a nice combo pack...

then just run a bunch of scans and see what turns up...

best practice is if you had a known good secondary computer you could connect the harddrive of the bad one and scan it that way.

Ive read that Opera works when all others fail...

Great, now the GOG forum just eats my posts. Great.

Have you checked if the time/date on your computer is right? Once that kept blocking me from sites because their certificates were too old/new.

Can you give us the certificate error message your browser throws up?

A dead CMOS battery can cause what Chisaku mentioned (because your date and time will get wiped whenever the power is cut, i.e. comp is unplugged).

I've used like 10 anti-malware softwares, with no effect. All of sudden after 7 days or so https suddenly starts working... crazy microsoft windows. Installed Opera and it did not worked.

Tried a friend's laptop with my connection and it worked. The problem is with my Win7 64 machine then. Yes, I have read suggestions about the time. I've matched it with time.windows.com and still doesn't work.