About firewalls
Some networks use firewalls for security. Firewalls block certain Internet traffic from entering or leaving a network. Internet traffic moves through a firewall using ports. To use FaceTime and iMessage behind certain firewalls, you might need to ask your network administrator to enable these ports:
FaceTime
- 80 (TCP)
- 443 (TCP)
- 3478 through 3497 (UDP)
- 5223 (TCP)
- 16384 through 16387 (UDP)
- 16393 through 16402 (UDP)
iMessage
- 80 (TCP)
- 443 (TCP)
- 5223 (TCP)
Depending on the NAT configuration for your router and network, additional ports might be used to send and receive video. Some router features and configurations, such as port mapping, SIP dropping, or dynamic opening of media ports might interfere with FaceTime and iMessage. Contact your network administrator if you need help with port forwarding.

Learn more
- Make sure that your network is has the recommended settings for Wi-Fi routers and access points.
- Get help if you have issues using a Wi-Fi network.
- Learn more about FaceTime for iPhone and for Mac.
- Learn more about iMessage for iPhone and for Mac.