Troubleshooting: Warning 40001 – UDP Connectivity Blocked
Technical Breakdown
| Code | 40001 |
| Type | Warning |
| Category | Connectivity |
| Message | It seems like UDP traffic to the media servers might be blocked on your end. This is likely due to firewall rules. |
What is this about?
The system has detected that **UDP (User Datagram Protocol)** traffic is being blocked by your network. UDP is the “gold standard” for live video and audio because it allows data to stream continuously without the delays caused by error-correction protocols.
When UDP is blocked, your TytoCare session is forced to use TCP or TLS. While these allow the call to connect, they are much slower for real-time media and often lead to lag or synchronization issues.
Potential Risks
Running medical exams over TCP/TLS is not ideal. If the network experience even a momentary hiccup or packet loss, the “handshaking” nature of TCP will cause the video to freeze or the audio to cut out while it tries to recover missing data. This results in significantly poorer quality than a UDP connection.
Suggested Actions to Take
- Check Firewall/VPN Settings: If you are using a personal firewall or VPN, ensure that UDP traffic is allowed. Many security systems block UDP by default, viewing it as less secure than TCP.
- Corporate/Clinic Networks: Reach out to your IT administrator. Ask them to verify that the firewall allows outgoing UDP traffic on ports **10,000–60,000**.
- Home Router: Ensure that “SIP ALG” is disabled in your router settings, as this feature often interferes with UDP-based media streams.