That certificate is issued on March 9. 2013. Maybe there has been a real (not a self-signed) certificate but in that case someone has installed that self-signed certificate over it.
Just install a real certificate for the hostname.
I think it's a self-signed, and in some country in middle east have big issue with other SSL, that all country accepted. 
where you VPS is? or where your customer? Which country did provide your SSL?
where you VPS is? or where your customer? Which country did provide your SSL?
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