A technician is tightening outbound rules on a new SOHO firewall. So far, only TCP ports 53, 443, and 110 are allowed. Users can resolve hostnames, retrieve email from the POP3 server, and reach secure websites, but any attempt to open plain-text web pages results in a timeout. Which TCP port should be added to permit standard HTTP browsing?
Standard Hypertext Transfer Protocol (HTTP) sessions use TCP port 80. Without this port allowed, browsers cannot establish the initial connection for unencrypted web pages.
Port 21 is the FTP control channel and is unrelated to web browsing.
Port 23 is used by Telnet, a terminal emulation protocol, not by web browsers.
Port 143 is the default port for IMAP email retrieval. Allowing these ports would not restore access to ordinary HTTP sites.
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What is the purpose of TCP port 80?
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Why is HTTPS traffic not affected even if TCP port 80 is blocked?
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What is the difference between POP3 on port 110 and IMAP on port 143?