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Hi, I'm Anvar, I would be happy to help
you with this today If there is a corporate firewall between WSUS and the Internet, you may need to configure that firewall to ensure that WSUS can get updates. To receive updates from Microsoft Update, the WSUS server uses port 443 for the HTTPS protocol. Although most corporate firewalls allow this type of traffic, there are some companies that restrict Internet access from the servers due to the company's security policies. If your organization restricts access, you must obtain authorization to allow WSUS to access the Internet to the following list of URLs:
http://windowsupdate.microsoft.com
http://*.windowsupdate.microsoft.com https://*.windowsupdate.microsoft.com
http://*.update.microsoft.com
https://*.update.microsoft.com
http://*.windowsupdate.com
http://download.windowsupdate.com
https://download.microsoft.com
http://*.download.windowsupdate.com
http://ntservicepack.microsoft.com
(Source - https://social.technet.microsoft.com/Forums/en-...)
Schritt 2: Konfigurieren von WSUS | Microsoft Learn
Hope this helps. Let us know if you need further assistance.