Multi-iPad Synching - Firewall Settings

When using OCR Synching on a network with a firewall, you must enable the Bonjour service that apple uses.

According to this document:


The following ports are used by Bonjour:

UDP 1900

UDP 5350

UDP 5351

UDP 5353


You should be able to verify that you are seeing traffic on both sides of network. There are some apps that will help see the traffic. 



Apple iOS:


You should see services being advertised with names that start with “_OnCue”, such as 





The other On Cue specific ports that need to be open:

3700 TCP - sending transmitter page requests 

3701 UDP - listening for transmitter heartbeat

8888 TCP - Sync push/pull 

Was this article helpful?
0 out of 0 found this helpful
Have more questions? Submit a request


Powered by Zendesk