OpenSSL unable to get local issuer certificate unless CAfile is explicitly specified
问题 I'm trying to connect to Apple's Push Notification service from an Ubuntu server for an app. I've successfully generated the combined .pem certificate required by the pyAPNS provider I'm using. However, when I try to verify the certificate with openssl verify , I get error 20 at 0 depth lookup:unable to get local issuer certificate . It works if I specify the certificate authority explicitly ( openssl verify apns.pem -CAfile entrust_2048_ca.pem ), but I've already explicitly installed the