根据 https ：//www.ssllabs.com ，服务器支持密码套件

According to https://www.ssllabs.com, the server supports cipher suites

TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA 
TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
TLS_DHE_RSA_WITH_AES_256_CBC_SHA 

列出它们作为不可用的密码套件，你可以在调试消息中看到。

They are listed as "unavailable cipher suite" as you can see in the debug messages.

在JRE / lib / security / local_policy.jar中，我们看到

In the JRE/lib/security/local_policy.jar, we see

// Some countries have import limits on crypto strength. This policy file
// is worldwide importable.

grant {
    permission javax.crypto.CryptoPermission "DES", 64;
    permission javax.crypto.CryptoPermission "DESede", *;
    permission javax.crypto.CryptoPermission "RC2", 128, 
                                     "javax.crypto.spec.RC2ParameterSpec", 128;
    permission javax.crypto.CryptoPermission "RC4", 128;
    permission javax.crypto.CryptoPermission "RC5", 128, 
          "javax.crypto.spec.RC5ParameterSpec", *, 12, *;
    permission javax.crypto.CryptoPermission "RSA", *;
    permission javax.crypto.CryptoPermission *, 128;
};

下载并安装（JCE）Unlimited Strength Jurisdiction Policy Files - http://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html - 我可以确认问题已解决。自述文件说

Download and install "(JCE) Unlimited Strength Jurisdiction Policy Files" - http://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html - and I can confirm that the problem is solved. The read me file says

由于某些国家/地区的导入控制限制，
的版本捆绑了JCE策略文件在Java运行时环境中，
或JRE（TM），8环境允许强但有限的加密使用
。此下载包（包括此README文件的那个）
提供无限强度策略文件，其中不包含
加密强度限制。

Due to import control restrictions of some countries, the version of the JCE policy files that are bundled in the Java Runtime Environment, or JRE(TM), 8 environment allow "strong" but limited cryptography to be used. This download bundle (the one including this README file) provides "unlimited strength" policy files which contain no restrictions on cryptographic strengths.