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 A website hosted in Plesk fails to load when Cloudflare is used: ERR_TOO_MANY_REDIRECTS

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Alexander Tsmokalyuk
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Plesk for Windows Plesk for Linux kb: technical ABT: Group B

Applicable to:

  • Plesk for Linux
  • Plesk for Windows

Symptoms

  • A website behind Cloudflare shows the following error message in a web-browser:

    PLESK_INFO: ERR_TOO_MANY_REDIRECTS

    OR

    PLESK_INFO: The page isn’t redirecting properly

  • When Cloudflare is disabled, the website loads fine.

  • The Permanent SEO-safe 301 redirect from HTTP to HTTPS setting is enabled in Plesk at Domains > example.com > Hosting Settings or custom HTTPS redirection is configured in domain's .htaccess file. 

  • Trying to issue a Let's Encrypt certificate for the example.com domain fails with the following error:

    PLESK_ERROR: Invalid response from https://acme-v02.api.letsencrypt.org/acme/authz-v3/11481922061.
    Details:
    Type: urn:ietf:params:acme:error:connection
    Status: 400
    Detail: Fetching /.well-known/acme-challenge/UcTI6ov0Pc3Fn2IRnNUiFKZKzBu5NaAy4IoscLbYh_I: Redirect loop detected

Cause

The SSL setting is set as "Flexible" in Cloudflare Crypto settings for this domain.

Resolution

Log in to your Cloudflare account > click on the domain > click Crypto and change the SSL setting to "Full (strict)".

Note: The CloudFlare account is created automatically during the initial activation of the extension. Since the CloudFlare extension is enabled on the server, the corresponding account on a CloudFlare side already exists. If the account credentials are forgotten, try to recover the password via the following link to access Cloudflare dashboard: https://www.cloudflare.com/a/forgot-password
The same email should be specified as for the initial extension setup.

alternatively disable Permanent SEO-safe 301 redirect from HTTP to HTTPS at Domains > example.com > Hosting Settings 

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