---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/20011#article
headline: "20011: Invalid TLS version"
url: https://www.twilio.com/docs/api/errors/20011
inLanguage: en
dateModified: 2026-03-11T20:01:16.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 20011: Invalid TLS version

Log Level: ERROR

## Description

### Invalid TLS version

The request was rejected because it was not correctly configured to use TLSv1.2. All new accounts are [required to use TLSv1.2 with supported ciphers suites](https://support.twilio.com/hc/en-us/articles/360007724794).

### Possible solutions

* Reconfigure request to use a supported cipher suite for TLSv1.2
* Review these [tips for upgrading your environment to TLSv1.2](https://support.twilio.com/hc/en-us/articles/360006751753)