What are the potential firewall implications related to WSUS Error 403?

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Grade: Education Subject: Support
What are the potential firewall implications related to WSUS Error 403?
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Firewalls between the client and the WSUS server might be blocking the necessary ports (typically 8530 for HTTP and 8531 for HTTPS). Ensure that the firewall allows inbound and outbound traffic on these ports for the client and server.