---
page_type: error
code: 11220
message: "11220: SSL/TLS Handshake Error"
level: ERROR
---

## Description

During SSL/TLS negotiation, Twilio experienced a connection reset.

### Possible Causes

- Incompatible cipher suites in use by the client and the server. This would require the client to use (or enable) a cipher suite that is supported by the server.

### Possible Solutions

- Verify cipher suites in-use are up to date. Twilio-supported ciphers can be found [here](https://support.twilio.com/hc/en-us/articles/360007724794-Notice-Twilio-REST-API-s-TLS-and-Cipher-Suite-Security-Changes-for-June-2019)
- Use compatible version of TLS, Twilio supports TLS 1.2.