ssl - C# Paypal Sandbox's IPN simulator fails to send event because "the handshake was not verified" -


i developing paypal ipn event listener in c#. using paypal's ipn simulator able send events server , listener receive event. listener receive events using "subscribe" button generated paypal's sandbox.

starting few days ago however, sending ipn simulator server fails error message "ipn not sent, , handshake not verified. please review information." when use openssl command openssl s_client -connect api-3t.sandbox.paypal.com:443 -showcerts -capath /etc/ssl/certs/

loading 'screen' random state - done connected(00000114) 2092:error:14077410:ssl routines:ssl23_get_server_hello:sslv3 alert handshake fa ilure:.\ssl\s23_clnt.c:602:

as result. noticed in ipn history (which events generated using paypal button) of sandbox merchant account, http status code 500.

i've tried editing registry enable tls 1.2 on server, importing verisign g5 root certificate mmc. nothing seems working. certificate i'm using on server go daddy secure certificate authority - g2 (sha256rsa 2048bit).

strange thing is, can still receive events webhook simulator. plus, working before...

is there else experiencing this? maybe paypal did sandbox that's causing problem?


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