NSURLErrorDomain Code=-1012 - App Store Updates do not work on High Sierra Public Beta 6

Hi all!

On Saturday, I did an update from 10.12.6 to public beta 10.13 no 6, which did fine by the way :-). On Monday, public beta 7 was released and my App Store was just showing "Checking for updates".

Next, I checked the log file in /var/log/install.log and noticed the following:

2017-08-30 08:32:58+02 Svens-MacBook-Pro softwareupdated[662]: Failed Software Update - Refusing invalid certificate from host: swdist.apple.com
2017-08-30 08:32:58+02 Svens-MacBook-Pro softwareupdated[662]: Product 031-42263 did not load successfully. Error Error Domain=NSURLErrorDomain Code=-1012 "(null)" UserInfo={NSErrorFailingURLStringKey=https://swdist.apple.com/content/do...4haox84ouyngskdynwmubj/031-42263.English.dist, NSErrorFailingURLKey=https://swdist.apple.com/content/do...4haox84ouyngskdynwmubj/031-42263.English.dist}
2017-08-30 08:32:59+02 Svens-MacBook-Pro softwareupdated[662]: Failed Software Update - Refusing invalid certificate from host: swdist.apple.com
2017-08-30 08:32:59+02 Svens-MacBook-Pro softwareupdated[662]: Product 041-8943 did not load successfully. Error Error Domain=NSURLErrorDomain Code=-1012 "(null)" UserInfo={NSErrorFailingURLStringKey=https://swdist.apple.com/content/do...ik8t9izjyf1o3znkjoe6hdg/041-8943.English.dist, NSErrorFailingURLKey=https://swdist.apple.com/content/do...ik8t9izjyf1o3znkjoe6hdg/041-8943.English.dist}
2017-08-30 08:33:00+02 Svens-MacBook-Pro softwareupdated[662]: Failed Software Update - Refusing invalid certificate from host: swdist.apple.com
2017-08-30 08:33:00+02 Svens-MacBook-Pro softwareupdated[662]: Product 041-8932 did not load successfully. Error Error Domain=NSURLErrorDomain Code=-1012 "(null)" UserInfo={NSErrorFailingURLStringKey=https://swdist.apple.com/content/do...8i7ioapuz5goakzzzuvxmcn/041-8932.English.dist, NSErrorFailingURLKey=https://swdist.apple.com/content/do...8i7ioapuz5goakzzzuvxmcn/041-8932.English.dist}

So, something is wrong with the certificate of the domain swdist.apple.com.

I checked it by browsing to that link and the certificate is still valid from Apple.

I have also add it manually to my keychain, but the error remains.

The log file increases rapidly, 2-3 lines are generated per second.

Does anybody know, how to get rid of this error and get updates back to working?

Thanks,

Sven