once reset the tcp/ip winsock, the ivms 4200 back to working
changed the server port to 8008 (the original default port is 8000),
this can avoid port 8000 is conflicted with other apps.
change the ip address settings to no gateway.
then you can see gateway will only show one: 0.0.0.0
you need run command:
netsh winsock reset
netsh int ip reset ok.txt
note: this will clear your static ip address setting, you need setup
static ip address again.