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1 连接类型或权限问题
Server配置为使用 PSK 连接到agent，但agent仅接受未加密的连接
在server或proxy日志中有如下显示 (对于 GnuTLS 3.3.16)
Get value from agent failed: zbx_tls_connect(): gnutls_handshake() failed: \
-110 The TLS connection was non-properly terminated.在server或proxy日志中有如下显示 (对于 OpenSSL 1.0.2c)
Get value from agent failed: TCP connection successful, cannot establish TLS to [[127.0.0.1]:10050]: \
Connection closed by peer. Check allowed connection types and access rights一端使用证书连接，但另一端仅接受 PSK，反之亦然
在任意日志当中有如下显示 (对于 GnuTLS)：
failed to accept an incoming connection: from 127.0.0.1: zbx_tls_accept(): gnutls_handshake() failed:\
-21 Could not negotiate a supported cipher suite.在任意日志当中有如下显示 (对于 OpenSSL 1.0.2c)：
failed to accept an incoming connection: from 127.0.0.1: TLS handshake returned error code 1:\
file .\ssl\s3_srvr.c line 1411: error:1408A0C1:SSL routines:ssl3_get_client_hello:no shared cipher:\
TLS write fatal alert "handshake failure"尝试使用使用 TLS 支持编译的 Zabbix sender将数据发送到在没有 TLS 的情况下编译的 Zabbix Server/proxy
在发起连接方的日志中有如下显示：
Linux:
...In zbx_tls_init_child()
...OpenSSL library (version OpenSSL 1.1.1 11 Sep 2018) initialized
...
...In zbx_tls_connect(): psk_identity:"PSK test sender"
...End of zbx_tls_connect():FAIL error:'connection closed by peer'
...send value error: TCP successful, cannot establish TLS to [[localhost]:10051]: connection closed by peerWindows:
...OpenSSL library (version OpenSSL 1.1.1a 20 Nov 2018) initialized
...
...In zbx_tls_connect(): psk_identity:"PSK test sender"
...zbx_psk_client_cb() requested PSK identity "PSK test sender"
...End of zbx_tls_connect():FAIL error:'SSL_connect() I/O error: [0x00000000] The operation completed successfully.'
...send value error: TCP successful, cannot establish TLS to [[192.168.1.2]:10051]: SSL_connect() I/O error: [0x00000000] The operation completed successfully.在接受连接端的日志中有如下显示：
一端使用 PSK 连接，但另一端使用 LibreSSL 或已编译为无加密支持
LibreSSL 不支持 PSK。
在发起连接端的日志中有如下显示：
...TCP successful, cannot establish TLS to [[192.168.1.2]:10050]: SSL_connect() I/O error: [0] Success在接受连接端的日志中：
在Zabbix前端有如下显示：
Get value from agent failed: TCP successful, cannot establish TLS to [[192.168.1.2]:10050]: SSL_connect() I/O error: [0] Success一端使用 PSK 连接，但另一端使用禁用 PSK 支持的 OpenSSL
在发起连接端的日志中有如下显示：
...TCP successful, cannot establish TLS to [[192.168.1.2]:10050]: SSL_connect() set result code to SSL_ERROR_SSL: file ../ssl/record/rec_layer_s3.c line 1536: error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure: SSL alert number 40: TLS read fatal alert "handshake failure"在接受连接端的日志中有如下显示：