Meanwhile, you can check out our SSL Certificates to provide some level of security.Try our Virtual Agent - It can help you quickly identify and fix common VPN and AlwaysOn VPN issues.Īpplies to: Windows Server 2022, Windows Server 2019, Windows Server 2016, Windows Server 2012 R2, Windows 10 The Error 520 can be a tricky error particularly as its a Cloudflare error. Debug messages contain the trace details while debugging is enabled.Info provides general level information.Notice gives some important details of server’s condition.Warn message gives warning about the issue but it isn’t critical.Crit denotes the criticalness of the condition or state.If Alert level is shown on the message, act quickly to avoid further damage.Emerg notifies that the issue is highly important and the server can’t be accessed currently.Next, the client’s IP address and finally the actual message is shown and contains the path to the affected file.īelow, are the LogLevel severity level that can be found in the error log messages: So, once you know the structure, you can easily decode the message.īelow is an example of an error message: error description: /path/to/file/with/errorįirstly, there is the date and time stamp then followed by LogLevel security that tells how severe the message is. Note: The setting can be changed if you have permission else you need to contact the host. However, you can change the settings to read more error log messages. Now click on it.īy default, the error log page will show the last 300 error messages. Look for the Errors button within the metrics section. The method we provide is for cPanel users:įirst of all, you need to log into cPanel. Check out your server’s error logsĪfter disabling, pausing, or putting the Cloudflare into development mode, you can start troubleshooting error 520 by checking out your server’s error logs. Scroll down to the development mode section where you will see a small toggle button, turn it on. Once, you have logged in to the Cloudflare dashboard, click on the caching tab (placed with other tabs at the top of the page). Go into development modeĪdditionally, if you don’t want to disable or pause Cloudflare, you can go into the development mode and start troubleshooting the error. To pause Cloudflare, you need to scroll down and go to the advanced actions and then click on the Pause Cloudflare on the Site link. Then, you can either disable Cloudflare from the homepage or turn off the Cloudflare DNS cloud. This is important as you need to isolate the Cloudflare factor from it.įirst login to Cloudflare dashboard. Let’s see the troubleshooting steps to fix this HTTP error: Disable Cloudflareīefore moving to the troubleshooting part, the first and foremost step is to disable Cloudflare. How to Fix the Error 520: Web Server Is Returning An Unknown Error? So, if the TCP idle timeouts are shorter than 300 seconds then this unknown error could be triggered.Īlso Read: How to reduce bounce rate of a websiteĪs we have discussed what the 520 error is and its cause, now let’s see how we can fix the error 520. The TCP protocol is responsible for establishing and maintaining a network connection.This error triggers when the DNS of the domain points to the wrong server. Origin server returns an empty response, with no HTTPS status code or response body.Hence, it won’t be able to process the header. Header size exceeding Cloudflare’s header size limit of 8kb.Whitelisting those IPs addresses will resolve the problem. Cloudflare IPs are blocked by the origin server’s firewall.Hence, the server is unable to provide timely responses to the requests. Origin Web server application crashes due to the execution of a resource-intensive script.The most common reason for the error to occur is either a cronjob, the program is utilizing excessive server resources which makes the server misbehave and not able to manage all the requests appropriately.īelow are few probable reasons for the Cloudflare 520 error to occur: As a result, returns an empty, unknown or unexpected response. Usually, error 520 occurs when the origin server doesn’t work properly as expected and couldn’t service the request.
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