Is it dangerous for our computers to go into the site since the security certificate has expired?
Yes and no.
It doesn't matter you connect to the site with an outdated certificate, the traffic is still encrypted and FreeMoney just said he's aware of the problem, so the error isn't on your end.
However: Since the certificate isn't valid, an attacker could launch a MITM-attack and you would get a similar error, so there's currently no way of knowing whether you're getting that error because of the current problem or because of an attack.
So I would recommend _not_ logging in as long as the error's not fixed. If you have Bitcoins on that site, and if you fall victim to a MITM-attack now, your Bitcoins will most likely be gone. Just sit tight and wait till it's fixed.
I logged on, pulled some btc back to my wallet, and played a little PLO just fine, despite the certificate. Just so you know. There's like 200 people currently logged on playing fine, though admin said in Seals chat that there is still an attack ongoing.
As I said, logging in will work just fine. And playing will work just fine as well. But there's no way to know if you're being attacked by a MITM-attack. The chances of an attack are extremely low, but why risk it? Just sit tight
