---
page_type: error
code: 52145
message: "52145: Failed to authenticate with APNs"
level: ERROR
product: Notifications
---

## Error - 52145

### Failed to authenticate with APNs

#### Possible Causes

- Unable to complete the TLS handshake with APNs.

#### Possible Solutions

- Verify that your certificate and private key are correct and can be used together.
- Verify that your certificate has not been revoked.
- If the problem persists, please contact [customer support](https://www.twilio.com/help/contact).