UDP Connection Failure

A UDP connection failure usually indicates that the client cannot receive UDP packets from the rendering server correctly.

## Cause

In most environments, the server can use `0.0.0.0` as the listening address for UDP communication. However, in some special network environments, UDP communication requires the rendering server to bind to a specific IPv4 address instead of `0.0.0.0`.

## Solution

### Configure the Listening IP Address

1. Open the following configuration file on the rendering server:

```text
   larkxr-render/application.properties
   ```

2. Locate the UDP listening address configuration for the VR rendering server.
3. Replace the default listening address `0.0.0.0` with the actual IPv4 address of the server.
4. Save the file.
5. Restart the rendering service.
6. Test the UDP connection again from the client.

![Example of UDP listening IP configuration](https://docs.paraverse.cc/media/202504/8d97c3c2bee04591ac39c0019f3517591137.png)

## Notes

- Use the actual IPv4 address assigned to the server network interface.
- Do not use `0.0.0.0` in environments where UDP traffic requires explicit interface binding.
- If the issue persists after updating the listening IP, also verify firewall rules, NAT behavior, and whether the client can reach the server over UDP.