Help on not provisioning new server with Two interface: enp4s0 and enp6s0

New server has two interfaces, enp4s0 and enp6s0 ethernet port.
enp4s0 is used to communicate with Foreman server and enp6s0 is not used and not connected anywhere.
when Kickstart default pxegrub2 is excuted for provisioning, following warning in infinite loop.

Warining in infinite loop :
dracut-initqueue[1307]: Warning anaconda: failed to fetch kickstart from /provision?token=xxx.
IPv6:ADDRCONF(NETDEV_UP) enp6s0: link is not ready

Expected outcome:
enp4s0 to fetch kickstart

Foreman and Proxy versions:
Forman 3.3, Katello 4.5 smartproxy 3.3.0
Foreman and Proxy plugin versions:

Distribution and version:

Other relevant data:

found the reason ! in /etc/foreman-proxy/settings.yml
:http_port: 8000 is comment out after upgrade foreman 3.2 to 3.3.
after removing #, service foreman-proxy restart, it is working correctly.
Happy foreman