Facebook / LinkedIn share page – https opengraph issues [closed]

I am having a very similar problem for which you can see detailed info and diagnosis here: http://www.themastfarminn.com/php-prob/

I sent in a support ticket to hosting company and here is what they replied:

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We recently updated our Mod Security settings for all signature accounts. This will block any requests that do not include the user-agent string in the HTTP header and send a forbidden response. To fixed the problem you will need to update your script (curl script) to include a user-agent string and the server will then allow the connection. For reference, you might to view the link below:

https://msdn.microsoft.com/en-us/library/ms537503%28v=vs.85%29.aspx

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That was not at all helpful to me as I have no clue about how to do what they say needs to be done, but perhaps you do.