---
page_type: error
code: 51005
message: "51005: Client Connection: Command or keepalive acknowledgement not received"
level: ERROR
---

## Warning - 51005

### Client Connection: Command or keepalive acknowledgement not received

#### Possible Causes

The client did not acknowledge a message or a keep-alive request, which is required by the connection protocol therefore the connection has been dropped. This is most often caused by network connectivity issues.

#### Possible Solutions

Twilio SDKs automatically recover and reestablish the connection if possible. For best user experience, ensure reliable network connectivity.