Optionally Configure the Tang Server to Run on a Specified Port

By default, Tang runs on TCP port 80. If you intend to override this setting to run a Tang server on another port, you must configure SELinux so that Tang works with the required TCP port.

Configure Tang to listen on a chosen TCP port.
For example, to configure Tang to listen on TCP port 7500, run:
```
sudo semanage port -a -t tangd_port_t -p tcp 7500       
```
Configure a Systemd override so that Tang listens on the chosen port.
If you have chosen to run Tang on a different port, you must configure a Systemd override by configuring a Socket entry:
```
sudo mkdir -p /etc/systemd/system/tangd.socket.d/
sudo cat <<EOF > /etc/systemd/system/tangd.socket.d/port.conf
[Socket]
ListenStream=
ListenStream=7500
EOF
```
Reload Systemd daemon configuration.
If you edit Systemd configuration you must reload Systemd daemon configuration for the changes to take effect:
```
sudo systemctl daemon-reload
```

You must configure the firewall to allow traffic to reach the configured TCP port. See Update the Firewall Policy to configure the firewall.