Error 1013: HTTP hostname and TLS SNI hostname mismatch

Error 1013: HTTP hostname and TLS SNI hostname mismatch – Causes and Fixes Print

Modified on: Wed, 11 May, 2022 at 7:18 PM

Causes

The hostname sent by the client or browser via Server Name Indication (SNI) does not match the request host header. It is commonly caused by the following:

your local browser setting the incorrect SNI host header
a network proxying SSL traffic caused a mismatch between SNI and the Host header of the request.

Fixes

Step 1

Test for an SNI mismatch via an online tool such as: SSL Shopper.

Step 2

Provide Cloudflare Support the following information:

A HAR file captured while duplicating the error

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Error 1013: HTTP hostname and TLS SNI hostname mismatch – Causes and Fixes

Error 1013: HTTP hostname and TLS SNI hostname mismatch – Causes and Fixes Print

Causes

Fixes

Step 1

Step 2

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