<b>Listen to (Port/Listen)</b>
<p>
Ports/addresses that are listened to. The default port 631 is reserved
for the Internet Printing Protocol (IPP) and is what is used here.</p>
<p>
You can have multiple Port/Listen lines to listen to more than one
port or address, or to restrict access.</p>
<p>
Note: Unfortunately, most web browsers don't support TLS or HTTP Upgrades
for encryption. If you want to support web-based encryption you will
probably need to listen on port 443 (the "HTTPS" port...).</p>
<p>
<i>ex</i>: 631, myhost:80, 1.2.3.4:631</p>