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It looks like the old IPN sandbox endpoint is no longer working again.
Instead of this:
so how VA23 told:
yesterday I changed the Sanbox Endpoint
We were always using https://www.sandbox.paypal.com/cgi-bin/webscr
We've given up on the sandbox, though, and are now testing on the live platform with prices set to just a few cents. I must say I'm completely unimpressed with the sandbox and with the lack of support for this issue.
my merchant id in sandbox is 4VEX8DNAVZ9BJ
I see the IPN message is sent to my IPN post back url. But, the PayPal response is empty when I receive it. It was working before (for a few years now) and not sure if something changed. However, IPN simulator is able to successfully post to my URL.
Our server supports TLS1.2 and when I open connection with PayPal, I get the following exception java.lang.ClassNotFoundException: com.ibm.jsse2.SSLSocketFactoryImpl; java.lang.ClassNotFoundException: com.ibm.jsse2.SSLSocketFactoryImpl
Here are the supported protocol versions - [TLSv1.3, TLSv1.2, TLSv1.1, TLSv1, SSLv3, SSLv2Hello]
When I run the TlsCheck.java, get inputstream from https://tlstest.paypal.com connection is empty (PayPal_Connection_OK message is not present). Please help. Let me know if any other information is needed.