Virtual Private Networks are not blocked by firewalls, but if you are unable to use Ivacy VPN, all you need to do is to create a relevant exception in your firewall settings. Ivacy supports the following protocols:

• OpenVPN – TCP: 80 (Default Port)
• Open VPN – UDP: 53 (Default Port)
• PPTP: 1723
• Remote Access: 3389
• L2TP: 1701
• SSTP: 443
• IKEV: 4500
• IPSEC: 500

Note: Ivacy VPN supports ports ranging from 5500 to 30000 with the OpenVPN TCP and OpenVPN UDP protocols.