1 连接类型或权限问题

服务器配置为与agent程序连接，但agent仅接受未加密的连接

在服务器或proxy日志（带有mbed TLS（PolarSSL）1.3.11）

  1. Get value from agent failed: ssl_handshake(): SSL - The connection indicated an EOF

在服务器或proxy日志中（使用GnuTLS 3.3.16）

  1. Get value from agent failed: zbx_tls_connect(): gnutls_handshake() failed: \
  2.     -110 The TLS connection was non-properly terminated.

在服务器或proxy日志中（使用OpenSSL 1.0.2c）

  1. Get value from agent failed: TCP connection successful, cannot establish TLS to [[127.0.0.1]:10050]: \
  2.     Connection closed by peer. Check allowed connection types and access rights

一方连接证书，但另一方只接受PSK，反之亦然

在任意日志中（使用mbed TLS（PolarSSL））：

  1. failed to accept an incoming connection: from 127.0.0.1: ssl_handshake():\
  2.     SSL - The server has no ciphersuites in common with the client

在任意日志中（使用GnuTLS）：

  1. failed to accept an incoming connection: from 127.0.0.1: zbx_tls_accept(): gnutls_handshake() failed:\
  2.     -21 Could not negotiate a supported cipher suite.

在任意日志中（使用OpenSSL 1.0.2c）：

  1. failed to accept an incoming connection: from 127.0.0.1: TLS handshake returned error code 1:\
  2.     file .\ssl\s3_srvr.c line 1411: error:1408A0C1:SSL routines:ssl3_get_client_hello:no shared cipher:\
  3.     TLS write fatal alert "handshake failure"