Coordinator has failed to respond

Hey all, I can’t get my second computer to connect to a swarm coordinated by my first computer.

Swarm coordinator:
RAYVENGER
Windows 8.1
192.168.1.8

Swarm coordinator app sees RAYVENGER, does not see any other machines

Second computer:
OLDNBUSTED
Windows 7
192.168.1.5
Able to ping 192.168.1.8

Firewall is disabled on both computers, also they’re hardwired to the same gigabit ethernet router

Seeing this error output on OLDNBUSTED when I run “Ping Coordinator”:

9:06:02 PM: [Network] Pinging Coordinator...
9:06:02 PM: [PingRemoteHost] Successfully pinged RAYVENGER with RAYVENGER
9:06:02 PM: [Ping] Communication with the coordinator failed, job distribution will be disabled until the connection is established
9:06:02 PM: Exception details: System.NullReferenceException: Object reference not set to an instance of an object.
   at SwarmCommonUtils.NetworkUtils.<>c__DisplayClass1.<GetBestInterface>b__0(NetworkInterface Interface) in d:\BuildFarm\buildmachine_++depot+UE4-Releases+4.8\Engine\Source\Programs\UnrealSwarm\SwarmCommonUtils\Utils.cs:line 33
   at System.Linq.Enumerable.WhereArrayIterator`1.MoveNext()
   at System.Linq.Enumerable.Count[TSource](IEnumerable`1 source)
   at SwarmCommonUtils.NetworkUtils.GetBestInterface(IPAddress Address) in d:\BuildFarm\buildmachine_++depot+UE4-Releases+4.8\Engine\Source\Programs\UnrealSwarm\SwarmCommonUtils\Utils.cs:line 36
   at Agent.Agent.PingCoordinator(Boolean ForcePing) in d:\BuildFarm\buildmachine_++depot+UE4-Releases+4.8\Engine\Source\Programs\UnrealSwarm\Agent\Connections.cs:line 2121
9:06:02 PM: [Network]     Coordinator has failed to respond
9:06:02 PM: [Network] Coordinator ping complete

When I try to ping with the swarm coordinator set to 192.168.1.8:

9:06:57 PM: [PingCoordinator] Determined that we shouldn't ping the coordinator right now
9:06:58 PM:  ......... using SwarmCoordinator on 192.168.1.8
9:06:58 PM: [PingRemoteHost] Successfully pinged 192.168.1.8 with 192.168.1.8
9:06:58 PM: [Ping] Communication with the coordinator failed, job distribution will be disabled until the connection is established
9:06:58 PM: Exception details: System.NullReferenceException: Object reference not set to an instance of an object.
   at SwarmCommonUtils.NetworkUtils.<>c__DisplayClass1.<GetBestInterface>b__0(NetworkInterface Interface) in d:\BuildFarm\buildmachine_++depot+UE4-Releases+4.8\Engine\Source\Programs\UnrealSwarm\SwarmCommonUtils\Utils.cs:line 33
   at System.Linq.Enumerable.WhereArrayIterator`1.MoveNext()
   at System.Linq.Enumerable.Count[TSource](IEnumerable`1 source)
   at SwarmCommonUtils.NetworkUtils.GetBestInterface(IPAddress Address) in d:\BuildFarm\buildmachine_++depot+UE4-Releases+4.8\Engine\Source\Programs\UnrealSwarm\SwarmCommonUtils\Utils.cs:line 36
   at Agent.Agent.PingCoordinator(Boolean ForcePing) in d:\BuildFarm\buildmachine_++depot+UE4-Releases+4.8\Engine\Source\Programs\UnrealSwarm\Agent\Connections.cs:line 2121
9:06:58 PM:  ......... SwarmCoordinator failed to be initialized
9:06:58 PM: [PingCoordinator] Determined that we shouldn't ping the coordinator right now
9:06:58 PM: [PingCoordinator] Determined that we shouldn't ping the coordinator right now
9:06:59 PM: [PingCoordinator] Determined that we shouldn't ping the coordinator right now
9:06:59 PM: [Network] Pinging Coordinator...
9:06:59 PM: [PingRemoteHost] Successfully pinged 192.168.1.8 with 192.168.1.8
9:06:59 PM: [PingCoordinator] Determined that we shouldn't ping the coordinator right now
9:06:59 PM: [Ping] Communication with the coordinator failed, job distribution will be disabled until the connection is established
9:06:59 PM: Exception details: System.NullReferenceException: Object reference not set to an instance of an object.
   at SwarmCommonUtils.NetworkUtils.<>c__DisplayClass1.<GetBestInterface>b__0(NetworkInterface Interface) in d:\BuildFarm\buildmachine_++depot+UE4-Releases+4.8\Engine\Source\Programs\UnrealSwarm\SwarmCommonUtils\Utils.cs:line 33
   at System.Linq.Enumerable.WhereArrayIterator`1.MoveNext()
   at System.Linq.Enumerable.Count[TSource](IEnumerable`1 source)
   at SwarmCommonUtils.NetworkUtils.GetBestInterface(IPAddress Address) in d:\BuildFarm\buildmachine_++depot+UE4-Releases+4.8\Engine\Source\Programs\UnrealSwarm\SwarmCommonUtils\Utils.cs:line 36
   at Agent.Agent.PingCoordinator(Boolean ForcePing) in d:\BuildFarm\buildmachine_++depot+UE4-Releases+4.8\Engine\Source\Programs\UnrealSwarm\Agent\Connections.cs:line 2121
9:06:59 PM: [Network]     Coordinator has failed to respond
9:06:59 PM: [Network] Coordinator ping complete

Anyone have any ideas what might be going wrong?

Thanks

Have you tried running the coordinator at your other computer?
I had the same issue with this setup:

**Laptop: ** Owning Project, Running Coordinator, Running Swarm

**Server: ** Running Swarm

and after changing the setup to this it worked:

**Laptop: ** Owning Project, Running Swarm

**Server: ** Running Coordinator, Running Swarm

I use LogMeIn Hamachi to create a virtual private network to connect my laptop and the server.