For the past few months I have been having an issue with Steam, and I have finally decided to ask about it. I've looked up solutions but none of them work, and nobody else has seemed to have had the same problem.
Any time I try visiting a page (except for my Library page for some reason) Steam will give me this error: Apparently nobody I can find has had the same issue. I can't contact Steam support because their support email is down apparently and if I try filling out the form, it gives this same error. If I try using it on my browser it says that the URL isn't secure. I have made sure the URL is correct too.
Things I've tried:
Clearing my Cache
Restarting my system
Much more other stuff, the list could go on.
If you need details on my system info, please ask me for the specific information you need. You can also ask if you need more details on the error or anything else.
At the same time I tried looking at more info for the issue and when I looked at the certificate details it says it was issued on "Tuesday, December 21, 2021 at 6:00:00 PM", and expires on "Wednesday, December 21, 2022 at 5:59:59 PM". So it's not expired.
I have also checked out the more information tab on the security warning my browser gives me, it says it may be due to a network attack but I highly doubt it, I even ran malware scanners and checked with other sites/devices connected to the network and this problem doesn't happen with the other stuff. Other browsers I tried also give me the same warning.
Edit for certificate checking and stuff:
I went through and checked if the certificate is in the list of trusted authorities, and it is.
However if I try to open it, it will give me this error before letting me continue.
The thumbprint (5fb7ee0633e259dbad0c4c9ae6d38f1a61c7dc25) matches the one given to me by @user1558321, but I did notice that when I look at it four of the things have a special icon on them, two are yellow warnings and two look like download symbols.
I think it might be something to do with the error below, but I don't know how to give it a valid signature or pathway.
Post note: This answer did work, I just accidentally did something wrong and forgot to remove the old invalid certificate from my PC!