Webstorm deployment is not working on modern mac and IPv6

First of all, get all interfaces:

networksetup -listallhardwareports
# or
ifconfig

Possible solutions:

1. It’s working but you should do it after every login to your mac:

sudo ifconfig en7 down # you should check what interface inactivation works for you

2. In webstorm:
Help → Edit custom VM options

-Djava.net.preferIPv4Stack=false
-Djava.net.preferIPv6Addresses=true

Help → Edit custom properties

deployment.macOs.bannedInterfaces=awdl0,utun0,utun1,utun2,utun3

You should also check what interfaces work for you.