You or your network administrators must manage any firewalls involved with remote servers. If you are initially installing in a test environment, disable all firewalls until you are satisfied with your zPDT® license operations. Disabling firewalls helps distinguish network-related problems from Software-based License Server issues. If you operate through firewalls you must ensure that the relevant port numbers can pass through the firewalls.

There are many management techniques for firewalls, depending on what product is being used. Many Linux® systems respond to iptables commands:

#	iptables -I INPUT -p tcp --dport 1947 -j ACCEPT
#	iptables -I INPUT -p udp --dport 1947 -j ACCEPT
#	iptables -I INPUT -p tcp --dport 9450 -j ACCEPT 
#	iptables -I INPUT -p tcp --dport 9451 -j ACCEPT