Paypal access permission error

-- HikaShop version -- : 2.6.1
-- Joomla version -- : 3.4.8
-- Error-message(debug-mod must be tuned on) -- : You don't have permission to access " www.paypal.com/cgi-bin/webscr " on this server

A customer has reported this error when trying to pay via paypal from a mobile phone..

You don't have permission to access " www.paypal.com/cgi-bin/webscr " on this server

We have been taking paypal payments successfully up until recently. I have found references to paypal api changes that might be the cause of the problem but don't know how to fix.

Help please!

Thanks,

Ian

Hi,

This indicates a problem of HTTPS authentication with paypal.com's server I think.
Basically, it looks like PayPal is refusing the connection between the security protocol used by the browser for the HTTPS communication is too weak for their new criteria.
That's what I'm guessing since I'm not working at PayPal and thus can't check the logs of that payment request.
The best is to contact the PayPal support and provide them with the error message and the reference in the screenshot so that they can check what is wrong.
I highly suspect that the problem cannot be solved by changing something in HikaShop or even in the settings of HikaShop, but that the problem might be with the browser of the user, especially since it still works for everyone else.