Check PHP providing and php-directives configuration on your server. Make sure your server is enabled for PHP 5.2 and higher.

Make sure that the user on whose behalf running PHP has write permissions to the root directory (root folder) of your website. If PHP works on your server as an Apache – it works on behalf of the same user as Apache. If PHP is running in the mode of CGI, it is most likely not the case.

You should be able to connect by 7000 TCP port.

Check redirects in .htaccess file. Make sure that there is no any redirects (force redirect) to other pages (URLs) when accessing to a Sync File. For example, if .htaccess RewriteEngine on is configured you should check the terms of referrals. Thus, for example, should not be to create the conditions in which is not possible to access to a Sync File (for example, there is only access to the file index.html / index.php root directory of the website can be opened when the sync problem).

Make sure the Sync File is available for a direct link on your website. If the file is available you will see a successful connection message. If the file is not available – you will not see a response. It means that a Sync File is not uploaded to the website’s root folder, or the website itself is not available (any host problem). In this case, you should contact the technical support of your host.

Check whether there is enough free space on your server. To use the platform at least 10 megabytes of free space on your server is needed as a minimum.

Check your server’s or website’s firewall access permissions. Your server (resource) must receive and send data to the tool’s CDN at IP 51.81.107.180, 135.148.103.139. If you already have a firewall or any other requests filtering tools (on your site or on the server), you should add the specified IP to your whitelist.