According to this blog entry
https://www.epicgames.com/site/en-US/news/epic-is-turning-off-online-services-and-servers-for-some-older-games
Epic Games shut down the last official master server, after gamespy did the same.

That means, one is no more able to find games online, you only find servers in your favourites or by entering a known IP.

Fortunately there are several alternative master servers and here is an instruction.

#########################################################################################################

This is the part for the game client, for you as a player

First:
Open your UnrealTournament.ini and navigate to "UBrowserAll"

You will find these standard entries
-


[UBrowserAll]
ListFactories[0]=UBrowser.UBrowserGSpyFact,MasterServerAddress=unreal.epicgames.com,MasterServerTCPPort=28900,Region=0,GameName=ut
ListFactories[1]=UBrowser.UBrowserGSpyFact,MasterServerAddress=master0.gamespy.com,MasterServerTCPPort=28900,Region=0,GameName=ut
bHidden=True
bFallbackFactories=True

-
The ListFactories[0] and [1] are now obsolete and should be edited to the following. FallbackFactories=True should be set to False:
-

[UBrowserAll]
ListFactories[0]=UBrowser.UBrowserGSpyFact,MasterServerAddress=master.333networks.com,MasterServerTCPPort=28900,Region=0,GameName=ut
ListFactories[1]=UBrowser.UBrowserGSpyFact,MasterServerAddress=master.newbiesplayground.net,MasterServerTCPPort=28900,Region=0,GameName=ut
ListFactories[2]=UBrowser.UBrowserGSpyFact,MasterServerAddress=master.errorist.eu,MasterServerTCPPort=28900,Region=0,GameName=ut
bHidden=True
bFallbackFactories=False

-
Also edit this
-

[UBrowser.UBrowserMainClientWindow]
bKeepMasterServer=True


Now you will be able to find UT Game Servers in the ServerBrowser again.

########################################################################################################


If you are a server owner and want to use an alternative masterserver, follow the instrucions here:

Turn off your gameserver, otherwise all changes made will be overwritten.
In your server.ini find the section [Engine.GameEngine] It will look like this:
-

[Engine.GameEngine]
CacheSizeMegs=4
UseSound=True
ServerActors=IpDrv.UdpBeacon
ServerActors=IpServer.UdpServerQuery
ServerActors=IpServer.UdpServerUplink MasterServerAddress=master0.gamespy.com MasterServerPort=27900
ServerActors=IpServer.UdpServerUplink MasterServerAddress=utmaster.epicgames.com MasterServerPort=27900
ServerActors=UWeb.WebServer
ServerPackages=SoldierSkins
ServerPackages=Botpack
...

-
Edit the ServerActors=IpServer.UdpServerUplink lines so it looks like this
-

[Engine.GameEngine]
CacheSizeMegs=4
UseSound=True
ServerActors=IpDrv.UdpBeacon
ServerActors=IpServer.UdpServerQuery
ServerActors=IpServer.UdpServerUplink MasterServerAddress=master.333networks.com MasterServerPort=27900
ServerActors=IpServer.UdpServerUplink MasterServerAddress=master.newbiesplayground.net MasterServerPort=27900
ServerActors=IpServer.UdpServerUplink MasterServerAddress=master.errorist.eu MasterServerPort=27900
ServerActors=UWeb.WebServer
ServerPackages=SoldierSkins
ServerPackages=Botpack
...

-
Save the configuration file and restart your server. If everything is done correctly (take your time to , your server will now connect to these masterservers.

Note:
It can take some time for the server to be shown in the gamebrowser.
Servers seem not to allow more than 3 masterserver entries, it can crash the server. So if it crashes, reduce the number of masterservers to 3.
-
########################################################################################################


Further information on masterservers and support will also be given here:


https://333networks.com


Also there is a great thread on ut99.org


https://ut99.org/viewtopic.php?f=1&t=15589

NOTE: If you use the current patches from OldUnreal, there is no need to edit your config, as you will already be set and ready to go.