This port is from Xexun TK-103 device.
It is now in the Hardware device category.
Please try to select such data in the unit settings.
After that, you will need to configure the tracker to a new server and port specified in the unit menu - Settings - Common.
By default, the server is specified in the DNS format, if your tracker only supports the IP format of the server, then to see the IP format, click on the corresponding button next to the server value in the unit settings.