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Cloudflare err_ssl_protocol_error - Fix it Now ?

This article covers methods to resolve Cloudflare ERR_SSL_PROTOCOL_ERROR. Basically, this error happens as a result of a number of reasons that include wrong DNS settings, SSL mode, TLS version or issues with SSL certificate. 


To fix this error,

1. If you are not the site owner, contact the site owner and let them know you are having issues accessing their site.

2. The domain name has not fully been set to use Cloudflare yet. Check to see if there are non-Cloudflare nameservers that are conflicting with the assigned Cloudflare name servers.

3. You are signed up for Cloudflare, but you have set a DNS record to :grey:. If you have a subdomain or hostname and that serves HTTP/HTTPS traffic, we would advise that you :orange: this DNS record to take advantage of Cloudflare’s security and performance features. See What subdomains are appropriate for :orange:/:grey: clouds? 69

4. The Free Universal SSL certificate hasn’t yet been deployed, :grey: (deactivate) Cloudflare so that your website can continue to use your origin’s SSL certificate. Wait 24 hours and :orange: (activate) Cloudflare again to see if your SSL certificate has been successfully deployed.

5. You have some conflict with TLS 1.3, disable it and see if you still encounter the error.

6. You have selected Full SSL (strict) under your SSL/TLS app, but your origin does not have a valid certificate (i.e., it is expired, self-signed, or not issued by a trusted CA). Temporarily select another SSL option until you have a valid origin certificate in place.

7. Try to look at developer web console (firefox Ctrl+Shift+K) - anything interesting under Security tab.

8. Also, Try to run the command curl -vk on the affected domain.

Method to fix Cloudflare error 527

When a #connection is interrupted between Cloudflare data center and an origin #Railgun server(rg-listener), thus a #Cloudflare error 527 will occur. This is influenced by loss of #packet data or a #firewall restriction in this situation.

Fix Cloudflare error 1018

Cloudflare error 1018 is a common Cloudflare error which affects a domain whose DNS is hosted on the Cloudflare network in the case when cloudflare cannot resolve to the domain when trying to access it on a browser.


To resolve Cloudflare error 1016:

1. Verify your Cloudflare DNS settings include an A record that points to a valid IP address that resolves via a DNS lookup tool.

2. For a CNAME record pointing to a different domain, ensure that the target domain resolves via a DNS lookup tool.


Generally, to fix Cloudflare errors:

1. Contact your site administrator or hosting provider to eliminate these common causes.

2. Ensure your origin web server is responsive.

3. Review origin web server error logs to identify web server application crashes or outages.

4. Confirm Cloudflare IP addresses are not blocked or rate limited.

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