https://community.cloudera.com/t5/Support-Questions/Kafka-Ranger-SSL-integration-issue/m-p/298747#M219342 <PRE><SPAN>We are trying to enable SSL connection between Apache Ranger and Kafka cluster. After creating keystore and truststore for both Kafka and Ranger, we are unable to connect Kafka to Ranger and we are getting the following error message:</SPAN><BR /><BR />[2020-06-25 20:47:40,013] ERROR Unable to get the Credential Provider from the Configuration (org.apache.ranger.authorization.hadoop.utils.RangerCredentialProvider) java.lang.IllegalArgumentException: The value of property hadoop.security.credential.provider.path must not be null at com.google.common.base.Preconditions.checkArgument(Preconditions.java:122) at org.apache.hadoop.conf.Configuration.set(Configuration.java:1134) at org.apache.hadoop.conf.Configuration.set(Configuration.java:1115) at org.apache.ranger.authorization.hadoop.utils.RangerCredentialProvider.getCredentialProviders(RangerCredentialProvider.java:68) at org.apache.ranger.authorization.hadoop.utils.RangerCredentialProvider.getCredentialString(RangerCredentialProvider.java:46) at org.apache.ranger.plugin.util.RangerRESTClient.getCredential(RangerRESTClient.java:386) at org.apache.ranger.plugin.util.RangerRESTClient.getKeyManagers(RangerRESTClient.java:272) at org.apache.ranger.plugin.util.RangerRESTClient.buildClient(RangerRESTClient.java:188) at org.apache.ranger.plugin.util.RangerRESTClient.getClient(RangerRESTClient.java:176) at org.apache.ranger.plugin.util.RangerRESTClient.getResource(RangerRESTClient.java:156) at org.apache.ranger.admin.client.RangerAdminRESTClient.createWebResource(RangerAdminRESTClient.java:275) at org.apache.ranger.admin.client.RangerAdminRESTClient.getServicePoliciesIfUpdated(RangerAdminRESTClient.java:126) at org.apache.ranger.plugin.util.PolicyRefresher.loadPolicyfromPolicyAdmin(PolicyRefresher.java:264) at org.apache.ranger.plugin.util.PolicyRefresher.loadPolicy(PolicyRefresher.java:202) at org.apache.ranger.plugin.util.PolicyRefresher.run(PolicyRefresher.java:171) [2020-06-25 20:47:40,013] ERROR PolicyRefresher(serviceName=KafkaTest): failed to refresh policies. Will continue to use last known version of policies (51) (org.apache.ranger.plugin.util.PolicyRefresher) java.lang.IllegalArgumentException: TrustManager is not specified at org.apache.commons.lang.Validate.notNull(Validate.java:192) at org.apache.ranger.plugin.util.RangerRESTClient.getSSLContext(RangerRESTClient.java:369) at org.apache.ranger.plugin.util.RangerRESTClient.buildClient(RangerRESTClient.java:190) at org.apache.ranger.plugin.util.RangerRESTClient.getClient(RangerRESTClient.java:176) at org.apache.ranger.plugin.util.RangerRESTClient.getResource(RangerRESTClient.java:156) at org.apache.ranger.admin.client.RangerAdminRESTClient.createWebResource(RangerAdminRESTClient.java:275) at org.apache.ranger.admin.client.RangerAdminRESTClient.getServicePoliciesIfUpdated(RangerAdminRESTClient.java:126) at org.apache.ranger.plugin.util.PolicyRefresher.loadPolicyfromPolicyAdmin(PolicyRefresher.java:264) at org.apache.ranger.plugin.util.PolicyRefresher.loadPolicy(PolicyRefresher.java:202) at org.apache.ranger.plugin.util.PolicyRefresher.run(PolicyRefresher.java:171)<BR /><BR /></PRE> Sat, 27 Jun 2020 19:25:48 GMT SKL 2020-06-27T19:25:48Z