Can no longer access my repositories from my Windows machines

I’ve used GitHub for many years, almost entirely on Windows. Starting two days ago I can still perform operations on my (seldom used) Mac but not on either my Windows 10 desktop machine (recently subjected to the giant Windows update) nor on my Windows 10 laptop (which had not yet received that massive update when the problem showed up). I normally use SmartGit, but I’ve also tried without success command-line or Windows Desktop cloning. If I configure the HTTPS transport backend to be “Use the OpenSSL library”, here is what I get:

PS C:\Users\Bruce> git clone https://github.com/BruceSherwood/glowscript
Cloning into 'glowscript'...
fatal: unable to access 'https://github.com/BruceSherwood/glowscript/': SSL certificate problem: self signed certificate in certificate chain

I uninstalled Git and reinstalled, configuring the HTTPS transport backend to be “Use the native Window Secure Channel library” and I get this:

PS C:\Users\Bruce> git clone https://github.com/BruceSherwood/glowscript
Cloning into 'glowscript'...
fatal: unable to access 'https://github.com/BruceSherwood/glowscript/': schannel: next InitializeSecurityContext failed: Unknown error (0x80092012) - The revocation function was unable to check revocation for the certificate.

What can I do? I know nothing about these security issues, which never came up in all my years of using GitHub. I submitted this information to Github support but haven’t gotten a reply.

Bruce Sherwood

Oops. I see it isn’t just me. I missed seeing the note from other distressed Windows users.

Bruce

Since this is a duplicate of another topic, I’m going to go ahead and close this one. Please continue the conversation in the original.