# S00019 {#S00019}

## Error Code {#error_code .section}

S00019

## Error Message {#error_message .section}

`Failed to connect to host <xxx>, with error code: <xxx>. RefId: S00019`

## Probable Causes {#probable_causes .section}

This error occurs when the DolphinDB server fails to establish a TCP connection using the parameters*host* and *port*.

## Solutions {#solutions .section}

Ensure that the node `host:port` is running properly and the network connection to the current node is stable. Troubleshoot based on the specific error message and the [Chromium OS Documentation](https://chromium.googlesource.com/chromiumos/docs/+/master/constants/errnos.md).

**Parent topic:**[Error Code Reference](../../Troubleshooting/ErrorCode.md)

