Swarm agent can not ping coordinator

1.project has been opened in local host

2.swarm coordinator is running in localhost

3.there are 40 swarm agents
All agents are running in windows 7 OS, without antivirus software & filewall:
swarm agent1~40: …

swarm agent configuration:

62112-agentsettings.png

4.I have 2 copies “SwarmAgent.exe”

Applicaton version1: 1.7.2892.0 (within UE4 4.8.3)

Applicaton version2: 1.7.2891.0 (downloaded from internet)

5.what happened

question1: when SwarmAgent version1 are running in all agent computers, there are only 2 agents available in SwarmCoordinator

but only 1 agent can be assigned to local host, which cpusage could be 99%

All agents else logged “[Ping] Communication with the coordinator failed”

question2: when SwarmAgent version2 are running in all agent computers, all agents are available in SwarmCoordinator, and all agents can be assigned to local host, but their cpusage could be less 30%