Getting error "LGlocalhost:7100 unavailable". Has JDK 1.8.0_181 & Class path has set.Need to set any firewall settings?

My team has installed Neo load for a new project and started using it. But one person from my team installed Neo load in his new laptop and while running he keeps Getting error
"Load generator localhost:7100 unavailable " every time he ran the script. But i was able to run the script successfully. Both the system has java, except the version is different. I am having JDK 1.8.0_191 and he is having 1.8.0_181.
And in both the systems Java Class path has set properly. Is there any other firewall settings need to be setup in the system.