Unreal Fail To Create IPC Port

Hey Guys I am quite new to the Unreal Engine, and recently I faced a problem.
I created a blank project and I deleted the platform thingy. After that I dragged in a cube and applied a texture and a normal map to it. When I build the lighting it got stuck at 80% for a very long time. I even left my laptop on for days but it did not help. Just recently I checked the SwarmCache and I discovered this :

Starting up SwarmAgent …
… registering SwarmAgent with remoting service
… registering SwarmAgent network channels
[ERROR] Channel already registered, suggesting another SwarmAgent or client is running.
[ERROR] If you feel this is in error, check your running process list for additional copies of
[ERROR] SwarmAgent or UnrealLightmass (or other client) and consider killing them.
[ERROR] Sleeping for a few seconds and trying again…
[ERROR] Channel registration failed. Reason: Failed to create an IPC Port: Access is denied.

, Callstack: at System.Runtime.Remoting.Channels.Ipc.IpcServerChannel.StartListening(Object data)
at Agent.AgentApplication.Main(String[] args) in d:\BuildFarm\buildmachine_++depot+UE4-Releases+4.9\Engine\Source\Programs\UnrealSwarm\Agent\AgentApplication.cs:line 129.

*I did not know what to look for and I did not know where to look into.

The rest of the agent logs consist of the exact same error. Guys please help.

Using Intel Core I5 4GB ram 64bit windows 10.
Unreal Engine 4.9.2

This problem no longer exist in 4.10

We can’t switch to 4.10… already too advanced… What solution is there?

The same problem is happening on 4.17 - 4.19.
Can not open the swarm agent.exe app in the DOTNET folder

I have this problem in 4.23 (latest version). Very unfortunate

If you using unreal engine from source be sure to build the projekt “UnrealLightmass”

1 Like

If you using unreal engine from source be sure to build the projekt “UnrealLightmass”

Seriously, thank you so much!