Swarm is not working on network

Hello,

We run into a big issue with setting up light baking on a few machines.

Our set up

We use the server as our coordinator and we want to light build on a 3PC’s.
Our network is stable and everything communicates perfectly, the coordinator can see all the machines working on the swarm and indicating that they are available but unassigned.

We run 4.19 on all machines including server
our firewall is accepting swarm agent and coordinator
our settings are identical on all our PC’s.
Our IT Guy worked for half a day trying to solve the issue
Any help would be appreciated!

17:31:05: [Job] CloseJob: Rejected, unrecognized connection or job
17:31:10: [Job] Accepted Job C276742E-4987B5B7-82DC0088-C6F5A663
17:31:10: [CloseConnection] Closing connection 23201B95 using handle 23201B95
17:31:10: [CloseConnection] Connection confirmed for disconnection 23201B95
17:31:10: [CloseConnection] Closing bi-directional remote connection (23201B95)
17:31:10: [CloseConnection] Connection disconnected 23201B95
17:31:10: [MaintainConnections] Remote connection has closed (23201B95)
17:31:10: [MaintainConnections] Removed connection 23201B95
17:31:10: [MaintainConnections] All connections have closed
17:31:10: [Job] Error: Failed to pull a required file from remote Agent: UnrealLightmass-Projects_2018-08-22_20-11-33_387472-64bit.dll
17:31:10: [Job] BeginJobSpecification: Failed to cache necessary job files

There is more info

18:30:21: [EndJobSpecification] Tried to begin the job on a valid remote connection, but failed
18:30:21: [CloseConnection] Closing connection 232023C9 using handle 232023C9
18:30:21: [CloseConnection] Connection confirmed for disconnection 232023C9
18:30:21: [CloseConnection] Closing bi-directional remote connection (232023C9)
18:30:21: [CloseConnection] Closing connection 232023C9 using handle 232023C9
18:30:21: [CloseConnection] Connection already being disconnected, nothing to do 232023C9
18:30:21: [CloseConnection] Connection disconnected 232023C9
18:30:21: [MaintainConnections] Remote connection has closed (232023C9)
18:30:21: [MaintainConnections] Removed connection 232023C9
18:30:23: [Connect] Successfully opened a remote connection with DF-PC02
18:30:23: [EndJobSpecification] Tried to begin the job on a valid remote connection, but failed
18:30:23: [CloseConnection] Closing connection 232023CA using handle 232023CA
18:30:23: [CloseConnection] Connection confirmed for disconnection 232023CA
18:30:23: [CloseConnection] Closing bi-directional remote connection (232023CA)
18:30:23: [CloseConnection] Closing connection 232023CA using handle 232023CA
18:30:23: [CloseConnection] Connection already being disconnected, nothing to do 232023CA
18:30:23: [CloseConnection] Connection disconnected 232023CA
18:30:23: [MaintainConnections] Remote connection has closed (232023CA)
18:30:23: [MaintainConnections] Removed connection 232023CA
18:30:25: [Connect] Successfully opened a remote connection with DF-PC03
18:30:27: [EndJobSpecification] Tried to begin the job on a valid remote connection, but failed

It just connects and disconnects and this way could stay for hours

I have the same problem, no solution yet