Magento 2.2 Error 500 on payment execute

[mikerocker11]

I have integrated paypal in my Magento 2 store. In live mode the transaction was fine but in Sandbox mode the 90% of times I get this response in the payment/4564564/execute call:

2018-05-31T17:11:22+00:00 INFO (6): Magento\Framework\DataObject Object
(
    [_data:protected] => Array
        (
            [http_status] => 500
            [status] => 500
            [response_code] => -1
            [response_reason_code] => 0
            [message] => Unable to read response, or response is empty
        )

) 

Recently I got the same error on live mode and I don't know why. This sometimes happens, the purchase is charged but the order is not generated.

Someone can help me?

[dchayka]

Were you able to figure out the problem? I'm facing the same issue. The payment goes through but Magento order is not updated because fetching the transaction from PayPal fails. Unfortunately there's no logging for the request or the response from PayPal on the Magento side.