Ubiquiti UniFi – Ports Used

This article shows what UDP and TCP ports are used by the UniFi Network application by default. The information applies to both Network applications hosted on UniFi OS Consoles, such as UniFi Cloud Key (UCK-G2, UCK-G2-PLUS, and UC-CK) or UniFi Dream Machine (UDM or UDM-Pro), as well as self-hosted Network applications. 

Note: Make sure to always update your Network application to the latest version.

• Local Ingress Ports
• Ingress Ports required for L3 management over the internet
• Egress Ports required for UniFi Remote Access
• Changing Default Ports

Local Ingress Ports

Note: Although TCP 22 is not one of the ports UniFi Network operates on by default, it is worth mentioning in this article since it is the port used when UniFi devices or the Network application is accessed via SSH.

Ingress Ports required for L3 management over the internet

Note: These ports need to be open at the gateway/firewall as well as on the UniFi Network application host. This would be achieved by creating port forwards on the gateway/firewall where the application is hosted.

Egress Ports required for UniFi Remote Access

Note: In most cases, these ports will be open and unrestricted by default.

Changing Default Ports

Changing default port assignments can only be done on self-hosted Network applications (Windows/macOS/Linux). This can be accomplished as follows:

1. Close any instances of the UniFi Network application.

2. Modify the system.properties file, which can be found in the directory <unifi_base>/data/system.properties.

• For example, if port 8081 was in use and port 8089 was open, you could change it by modifying unifi.shutdown.port=8081 to unifi.shutdown.port=8089

3. Restart the UniFi Network application.

Note: Make sure there are no leading or trailing spaces, comments, or other characters like hash tags (#) on any custom lines. Otherwise, UniFi Network will ignore the customizations.

Source :
https://help.ui.com/hc/en-us/articles/218506997-UniFi-Ports-Used