Server is the IP address or domain name of the LDAP or AD server. Port is the port number of the LDAP which is by default 636 in this example. Connectionless will enable the UDP port where the default is TCP. SSL will try to connect in a secure way with the SSL/TLS encryption.

COM port assignement changes after reboot - WINDOWS 10 Feb 21, 2020 What port does X11 traffic use? | AnandTech Forums Sep 22, 2001

The port numbers in the range from 0 to 1023 (0 to 2 10 − 1) are the well-known ports or system ports. They are used by system processes that provide widely used types of network services. On Unix-like operating systems, a process must execute with superuser privileges to be able to bind a network socket to an IP address using one of the well-known ports.

When it comes to configure an SMTP server on a mail client it’s imperative to set the correct port number.The default port number of an outgoing SMTP server is 25: but a switch to another one can be needed: for instance, if you are facing issues with the SMTP connection (the client is not sending emails even if the server name is right) you can try to change the port as a troubleshooting windows port number – windowstricks.in

By default, the IIS Web Management Service listens on TCP port 8172. If Windows Firewall is enabled on your web server, you'll need to create a new inbound rule to allow TCP traffic on port 8172 (all outbound traffic is permitted by default in Windows Firewall). If you use a third-party firewall, you'll need to create rules to allow traffic.

How to Determine What Ports are Being Used in Windows 10