# 11220: SSL/TLS Handshake Error

Log Type: APPLICATION

Log 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 your TLS version and cipher suites are compatible with Twilio's security requirements. For more information, see [Monitoring Updates to Twilio REST API Security Settings](https://help.twilio.com/articles/226478767).