ranger admin和hdfs-plugin安装都没问题，也能正常添加Service：

但plugins页面却没有任何信息：

查看了ranger admin的日志，在点击Test Connection时会报如下错误：

org.apache.ranger.plugin.util.PasswordUtils (PasswordUtils.java:147) - Unable to decrypt password due to error
javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decrypting with padded cipher
at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:934)
at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:845)
at com.sun.crypto.provider.PBES1Core.doFinal(PBES1Core.java:416)
at com.sun.crypto.provider.PBEWithMD5AndDESCipher.engineDoFinal(PBEWithMD5AndDESCipher.java:316)
at javax.crypto.Cipher.doFinal(Cipher.java:2165)
at org.apache.ranger.plugin.util.PasswordUtils.decrypt(PasswordUtils.java:132)
at org.apache.ranger.plugin.util.PasswordUtils.decryptPassword(PasswordUtils.java:120)
at org.apache.ranger.services.knox.client.KnoxClient.getTopologyList(KnoxClient.java:79)
at org.apache.ranger.services.knox.client.KnoxClient$2.call(KnoxClient.java:406)
at org.apache.ranger.services.knox.client.KnoxClient$2.call(KnoxClient.java:402)
at org.apache.ranger.services.knox.client.KnoxClient.timedTask(KnoxClient.java:431)
at org.apache.ranger.services.knox.client.KnoxClient.getKnoxResources(KnoxClient.java:410)
at org.apache.ranger.services.knox.client.KnoxClient.connectionTest(KnoxClient.java:315)
at org.apache.ranger.services.knox.client.KnoxResourceMgr.validateConfig(KnoxResourceMgr.java:42)
at org.apache.ranger.services.knox.RangerServiceKnox.validateConfig(RangerServiceKnox.java:56)
at org.apache.ranger.biz.ServiceMgr$ValidateCallable.actualCall(ServiceMgr.java:575)
at org.apache.ranger.biz.ServiceMgr$ValidateCallable.actualCall(ServiceMgr.java:562)
at org.apache.ranger.biz.ServiceMgr$TimedCallable.call(ServiceMgr.java:523)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)