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Payment transaction failed. Reason Invalid HTTP response version: 2

Payment transaction failed. Reason Invalid HTTP response version: 2

Anyone have any experience fixing this issue?
Magento version 1.8

Whenever customer places an ourder the payment fails

Payment transaction failed. Reason
Invalid HTTP response version: 2

Paypal Express Checkout and Payflow gives same error.

I am far from a dev. Not sure what's wrong because our host says our SSL is good, and we did a test on the HTTP2 capability of the site and it passed.