Facebook URL debugger says a firewall is preventing site crawls and gives a 503

An example of a url hosted on DO servers

I have tested this URL and others everywhere else I can think of and not seeing the error.


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It is difficult to determine the underlying issue when you are not able to replicate the issue. Since Facebook is reporting that it is receiving a 503 when reaching your page I would recommend taking a look at your web server’s log files. If your server returned a 503 error to the Facebook service it would be recorded in your log.

If you are running Apache:

On Ubuntu/Debian /var/log/apache2/error.log

On CentOS/Fedora /var/log/httpd/error.log

If you are running Nginx: /var/log/nginx/error.log

All errors your server returns are recorded here by default usually with additional information about the error encountered.