# Swarm Agent \[ERROR\]

**URL:** <https://forums.unrealengine.com/t/swarm-agent-error/392015>\
**Category:** Platform & Builds\
**Tags:** error-building, freeze, swarm-agent, build, unreal-engine, UE4, question\
**Created:** [April 26, 2017, 9:57pm UTC](https://forums.unrealengine.com/t/swarm-agent-error/392015 "2017-04-26T21:57:32Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Freeze\_Everything](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Freeze\_Everything](https://forums.unrealengine.com/u/Freeze_Everything)\
**Post date:** [April 26, 2017, 9:57pm UTC](https://forums.unrealengine.com/t/swarm-agent-error/392015/1 "2017-04-26T21:57:32Z")

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So for some time now the UE freezes when i click on “Build” after looking at the Log in Swarm Agent i found the following:

[ERROR] Channel registration failed. Reason: Der angegebene Host ist unbekannt , Callstack: bei System.Net.Dns.InternalGetHostByAddress(IPAddress address, Boolean includeIPv6) bei System.Net.Dns.GetHostEntry(String hostNameOrAddress) bei System.Runtime.Remoting.Channels.CoreChannel.GetMachineName() bei System.Runtime.Remoting.Channels.CoreChannel.GetMachineIp() bei System.Runtime.Remoting.Channels.Tcp.TcpServerChannel.SetupMachineName() bei System.Runtime.Remoting.Channels.Tcp.TcpServerChannel…ctor(Int32 port) bei Agent.AgentApplication.Main(String[] args).

Just in case the “Reason:” translates to “The given Host is unknown”  
Does anyone know how to fix this?

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**Author:** ![TankbusterGames](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@TankbusterGames](https://forums.unrealengine.com/u/TankbusterGames)\
**Post date:** [April 26, 2017, 10:27pm UTC](https://forums.unrealengine.com/t/swarm-agent-error/392015/2 "2017-04-26T22:27:15Z")

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Make sure, no other program is using port 8008/8009, since a port can only be assigned once, so if another program uses the port, the Swarm server can not be created.

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**Author:** ![Freeze\_Everything](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Freeze\_Everything](https://forums.unrealengine.com/u/Freeze_Everything)\
**Post date:** [April 26, 2017, 10:30pm UTC](https://forums.unrealengine.com/t/swarm-agent-error/392015/3 "2017-04-26T22:30:23Z")

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how exactly do i check for the ports? Im not really knowlegable in that field beyond basics.

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**Author:** ![Tim\_Hobson](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Tim\_Hobson](https://forums.unrealengine.com/u/Tim_Hobson)\
**Post date:** [April 27, 2017, 1:29pm UTC](https://forums.unrealengine.com/t/swarm-agent-error/392015/4 "2017-04-27T13:29:23Z")

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You can follow the steps in my Swarm Agent Troubleshooting guide to check which ports are being used.

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**Author:** ![Freeze\_Everything](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Freeze\_Everything](https://forums.unrealengine.com/u/Freeze_Everything)\
**Post date:** [April 27, 2017, 2:24pm UTC](https://forums.unrealengine.com/t/swarm-agent-error/392015/5 "2017-04-27T14:24:20Z")

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So I now checked and ports 8008/8009 aren’t used.

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**Author:** ![anonymous\_user\_960a61fe](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_960a61fe](https://forums.unrealengine.com/u/anonymous_user_960a61fe)\
**Post date:** [March 28, 2018, 1:14pm UTC](https://forums.unrealengine.com/t/swarm-agent-error/392015/6 "2018-03-28T13:14:42Z")

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After using TCP tool, it was adobe creative cloud (uses the same ports for file sync/updating and DRM)