Allow Docker API Remote Access through Firewall

CentOS7

sudo firewall-cmd --state
sudo firewall-cmd --permanent --zone=public --add-rich-rule='
  rule family="ipv4"
  source address="[vRealize Appliance IP/Cloud Proxy IP]/32"
  port protocol="tcp" port="2376" accept'
sudo firewall-cmd --permanent --zone=public --add-rich-rule='
  rule family="ipv4"
  source address="[vRealize Appliance IP/Cloud Proxy IP]/32"
  port protocol="tcp" port="30000-32767" accept'
sudo firewall-cmd --permanent --zone=public --add-rich-rule='
  rule family="ipv4"
  source address="[Workstation IP]/32"
  port protocol="tcp" port="2376" accept'
sudo firewall-cmd --reload

Ubuntu18.04

sudo ufw status
sudo ufw allow from [vRealize Appliance IP/Cloud Proxy IP] to any port 2376
sudo ufw allow from [vRealize Appliance IP/Cloud Proxy IP] to any port 30000:32767 proto tcp
sudo ufw allow from [Workstation IP] to any port 2376
sudo ufw reload
sudo ufw enable