Failed to get a respond to the connection request

Hi,
I have this error message when I want to open this program. I have checked the port, firewall and all that it says in error and everything is working fine. Now I don’t know what this error means and I don’t have any idea how to fix it. Can anyone help me to repair it ? What are the standard settings to run this ?
Thank you !

0.0.0.0:5004 didn’t respond to the connection request. Check the address and port, and any firewall or router settings. (04:06:15)
OK
