java.naming.communication exception ：（ mydomain name）：636（port）[根异常是java.net.connectException：连接时间到时：连接]

Question

这是我以下的Java代码，我尝试通过在Active Directory和Java中设置SSL来验证管理员。

public class Unicode_passwordLdap{
    public static void main(String[] args){
        LdapContext ctx = null;
        
        try{
            Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
            System.setProperty("javax.net.ssl.trustStore", "C://Java//jre1.8.0_331//lib//security//cacerts");
            System.setProperty("javax.net.ssl.trustStorePassword", "changeit");
            System.setProperty("javax.net.ssl.keyStore", "C://Java//jre1.8.0_331//lib//security//cacerts");
            System.setProperty("javax.net.ssl.keyStorePassword","changeit");
            System.setProperty("javax.net.debug", "all");
            String baseName = ",CN=Users,DC=trial,DC=com";
            Hashtable env = new Hashtable();  
            env.put(Context.INITIAL_CONTEXT_FACTORY,  "com.sun.jndi.ldap.LdapCtxFactory");  
            env.put(Context.SECURITY_AUTHENTICATION, "Simple");  
            env.put(Context.SECURITY_PRINCIPAL, "cn=administrator" + baseName);  //"[email protected]"
            env.put(Context.SECURITY_CREDENTIALS, "admin1*");  //"Panda123*"
            env.put(Context.PROVIDER_URL, "ldaps://WS2K19.trail.com:636"); //dc=trial,dc=com
            //ldaps://WS2K19.trail.com:636
            env.put(Context.SECURITY_PROTOCOL, "ssl");
            ctx = new InitialLdapContext(env,null); 
            System.out.println("Connection Successfull");
}catch(Exception e){
            //System.out.println("Password Cannot be Changed");
            e.printStackTrace();
        }
    }
}

这是我遇到的以下错误，当我运行此Java代码时：

javax.naming.CommunicationException: WS2K19.trail.com:636 [Root exception is java.net.ConnectException: Connection timed out: connect]
        at com.sun.jndi.ldap.Connection.<init>(Connection.java:235)
        at com.sun.jndi.ldap.LdapClient.<init>(LdapClient.java:137)
        at com.sun.jndi.ldap.LdapClient.getInstance(LdapClient.java:1615)
        at com.sun.jndi.ldap.LdapCtx.connect(LdapCtx.java:2847)
        at com.sun.jndi.ldap.LdapCtx.<init>(LdapCtx.java:348)
        at com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxFromUrl(LdapCtxFactory.java:225)
        at com.sun.jndi.ldap.LdapCtxFactory.getUsingURL(LdapCtxFactory.java:189)
        at com.sun.jndi.ldap.LdapCtxFactory.getUsingURLs(LdapCtxFactory.java:243)
        at com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxInstance(LdapCtxFactory.java:154)
        at com.sun.jndi.ldap.LdapCtxFactory.getInitialContext(LdapCtxFactory.java:84)
        at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:694)
        at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:313)
        at javax.naming.InitialContext.init(InitialContext.java:244)
        at javax.naming.ldap.InitialLdapContext.<init>(InitialLdapContext.java:154)
        at Unicode_passwordLdap.main(Unicode_passwordLdap.java:63)

有人可以帮助解决此错误！！！