Which ports need to be open on my network?
If you are using Threema behind a Firewall, please make sure that the following TCP ports are open:
To make Threema Calls, port 3478 needs to be open for outgoing UDP traffic.
To reliably receive push notifications, the following TCP ports need to be open:
- 5223 (Apple)
- 5228-5230 (Google)
- 443 (Microsoft)