LG 43TNF5J Owner's Manual page 53

[UPnP]
Open and block UDP port 1900, which is used for UPnP.
• The default setting is [On]. Setting this feature to [Off] blocks UDP port 1900, making the UPnP function
unavailable.
• If you set this feature to [Off], Sync Mode's "Network" option will be deactivated. When the value for Sync Mode is
"Network, " the value switches to "Off, " deactivating the "Network" option.
• If you change the UPnP value, the change will not be applied before a [reboot].
• If you set UPnP to [Off], you cannot use Group Manager 2.0 properly.
[Ping Test]
Check your network status with the ping test.
[Port Control]
Unused ports can be blocked for network security.
[Connection Domain]
Change domain for checking network connection.
NOTE
• A reboot is recommended for the settings to be applied properly.
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