After investigating this issue thoroughly, it turns out that there are several different causes that might produce this error message in your browser. Here’s a shortlist of potential culprits that might be responsible for the apparition of this error code: Now that you know every potential culprit, here are a couple of verified methods that should allow you to identify or fix the issue:
Method 1: Checking the Status of CloudFlare’s Servers
Since this status code is tied to CloudFlare, the first thing you should do is make sure that they’re not dealing with a server issue that’s beyond your control. It’s possible that you’re seeing the Error 523: Origin is unreachable error message due to the fact that the Cloudflare server in your area is currently down or is being re-routed due to a maintenance session. Fortunately, there’s a quick way to check if the CloudFlare server that’s in charge of that particular website is affected. Simply visit the official Cloudflare status page, scroll down through the list of services, and locate the one associated with your particular location. If the location in question is labeled as Re-Routed or Inactive, there’s a very high chance that you are dealing with a server issue that is beyond your control – In this case, the only thing you can do right now is to wait until the Cloudflare manages to fix their server issue. On the other hand, if the investigation didn’t point towards any problem with Cloudflare, move down to the next potential method below.
Method 2: Changing the Default DNS
In case you are seeing the ‘Error 523: Origin is unreachable‘ error message with every website protected by Cloudflare that you attempt to visit, chances are are you’re dealing with an inconsistent DNS that’s preventing your computer from communicating with the host through Cloudflare. Several affected users that faced the same issue with Cloudflare have reported that they managed to fix the issue by changing the default DNS (Domain Name System) assigned by their ISP to the equivalent supplied by Google – You can do this for IPv4 and IPv6 to cover both potential scenarios. If you haven’t tried out this potential fix below, follow the instructions below to change the default DNS on your computer to Google’s Public DNS: If the same problem is still occurring, move down to the next potential fix below.
Method 3: Disable / Uninstall 3rd party Firewall
If you’re using a 3rd party firewall and you end up seeing the ‘Error 523: Origin is unreachable‘ error with every website protected by Cloudflare, changes are your security suite is blocking the connection – If you trust the websites that you see this error on, this most likely occurs due to a false positive. As it turns out, there are several 3rd party firewalls that are known to cause this problem. Cylance and Comodo are the most commonly reported culprits. If this scenario is applicable, the most elegant way of fixing the conflict is to whitelist the HTTP and HTTPS ports that Cloudflare uses:
HTTPS ports used by Cloudflare
44320532083208720968443
HTTP ports used by Cloudflare
80808088802052208220862095
Note: Keep in mind that the exact instructions for whitelisting ports in your 3rd party firewall will be different depending on the suite you’re using. Because of this, we can’t provide you with a definitive guide on this. In case you don’t want to whitelist the ports or you can’t find how to do it on your firewall, follow the instructions below to uninstall the problematic firewall and eliminate the conflict:
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