iPlanet 7 instance cannot access website without port number on URL

user7683467

iPlanet 7 instance starts up ok:

     Oracle iPlanet Web Server 7.0.23 B02/08/2016 02:21<br/><span>  info: HTTP3072: http-listener-abc: </span><a class="jive-link-external-small" href="http://xx.xx.xxx.xx:443" rel="nofollow">http://xx.xx.xxx.xx:443</a><span> ready to accept requests</span><br/>  info: CORE3274: successful server startup

In a browser, go to:

    <a class="jive-link-external-small" href="https://www.example.com:443" rel="nofollow">https://www.example.com:443</a><span> </span>

Website comes up fine.

But the URL does NOT work without the port number.

This gives "cannot connect" in the browser:

<span>  </span><a class="jive-link-external-small" href="https://www.example.com" rel="nofollow">https://www.example.com</a>

In general, one does not need to add the port number to visit a website!

I must have a configuration error, but cannot find anything wrong.

Any ideas? thanks!