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IPN connections have been working on a production server until 11 Jan when it started timing out. The php code tries to connect using the following code:
$fp = @fsockopen('ssl://www.paypal.com', 443, $errno, $errstr, 30)
I've checked the server supports TLSv1.0, TLSv1.1 and TLSv1.2
This is for the IPN postback right. Can you firm you're using HTTP 1.1?
Can you try using ipnpb.paypal.com instead to see if this endpoint is having the same issue for you?
Thanks for replying.
Yes it was for the IPN post back. It was found to be a connectivity issue at the hosting company's upstream provider, and is now fixed.