use same cmd of curl to post a verify request , some time sandbox server has an error in my Mac like this:curl: (35) LibreSSL SSL_connect: SSL_ERROR_SYSCALL in connection to sandbox.itunes.apple.com:443sometime return successfull.use same cmd of curl to post a verify request , some time sandbox server has an error in my server which is ec2 of AWS like this:curl: (35) TCP connection reset by peersometime return successfull