After a recent firewall change, several users report they can reach the internal intranet site but cannot browse any external websites. You discover that HTTPS traffic is being blocked. Which firewall port must be opened so users can securely access public websites again?
3389
8080
80
443
Web browsers establish encrypted sessions with external web servers using the HTTPS protocol, which by default uses TCP port 443. Allowing outbound (and corresponding return) traffic on this port restores secure web access. Ports 80 and 8080 carry unencrypted HTTP, while 3389 is used for Remote Desktop, so opening those would not solve the problem.
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