境内服务器无法获取到api.weixin.qq.com返回的证书。SSL handshake失败。 境外服务器可以正常进行SSL通信并拿到返回的证书。 具体测试命令如下： openssl s_client -connect api.weixin.qq.com:443 -servername api.weixin.qq.com -tls1_2 CONNECTED(00000003) write:errno=104 --- no peer certificate available --- No client certificate CA names sent --- SSL handshake has read 4320 bytes and written 0 bytes --- New, (NONE), Cipher is (NONE) Secure Renegotiation IS supported Compression: NONE Expansion: NONE No ALPN negotiated SSL-Session:     Protocol  : TLSv1.2     Cipher    : 0000     Session-ID:     Session-ID-ctx:     Master-Key:     Key-Arg   : None     Krb5 Principal: None     PSK identity: None     PSK identity hint: None     Start Time: 1552387922     Timeout   : 7200 (sec)     Verify return code: 0 (ok)