The Universal Firmware Update feature is relevant for IGEL OS 11 devices and earlier, not for IGEL OS 12 devices.
The UMS downloads the desired firmware using the URLs it received from the download server. The UMS uses port 443 for fwus.igel.com.
Direct Connection
The following figure illustrates the communication between the UMS Server and the IGEL download servers:
Via Proxy Server
When a proxy server is placed between the UMS Server and the IGEL download server, the port for the proxy server must be specified under UMS Administration > Global Configuration > Proxy Server.