Hello   CDH 5.16   I am working on the Impala, HttpFS configuration. I ask questions about errors during their configuration. The common part of the error is that the certificate's DNS is based on the domain (* .caspi.linecorp.com), but the internally-called url is called with the server's FQDN, so there is an error in verifying the certificate. HDFS & Yarn, Impala, and HttpFS. I want to know how to set it up. Below is an error message.   Impala Could not connect to hostname:21050: [Errno 111] Connection refused (code THRIFTTRANSPORT): TTransportException('Could not connect tohostname:21050: [Errno 111] Connection refused',)   F0605 14:15:44.792534 159140 impalad-main.cc:81] Could not build messenger: Runtime error: could not verify certificate chain (error with cert: subject=C = BE, O = GlobalSign nv-sa, CN = GlobalSign Organization Validation CA - SHA256 - G2, issuer=C = BE, O = GlobalSign nv-sa, OU = Root CA, CN = GlobalSign Root CA): unable to get issuer certificate . Impalad exiting.     HttpFS & Hue Occurs when API calls are made internally in Hue to HttpFS(File Browser) [11/Jun/2019 20:51:31 +0900] webhdfs ERROR Failed to determine superuser of WebHdfs at https://hostname:14000/webhdfs/v1: ("bad handshake: Error([('SSL routines', 'ssl3_get_server_certificate', 'certificate verify failed')],)",) Traceback (most recent call last): File "/opt/cloudera/parcels/CDH-5.16.1-1.cdh5.16.1.p0.3/lib/hue/desktop/libs/hadoop/src/hadoop/fs/webhdfs.py", line 154, in superuser sb = self.stats('/') File "/opt/cloudera/parcels/CDH-5.16.1-1.cdh5.16.1.p0.3/lib/hue/desktop/libs/hadoop/src/hadoop/fs/webhdfs.py", line 291, in stats res = self._stats(path) File "/opt/cloudera/parcels/CDH-5.16.1-1.cdh5.16.1.p0.3/lib/hue/desktop/libs/hadoop/src/hadoop/fs/webhdfs.py", line 285, in _stats raise ex WebHdfsException: ("bad handshake: Error([('SSL routines', 'ssl3_get_server_certificate', 'certificate verify failed')],)",) [11/Jun/2019 20:51:31 +0900] exceptions_renderable ERROR Potential detail: ("bad handshake: Error([('SSL routines', 'ssl3_get_server_certificate', 'certificate verify failed')],)",)     Thanks ... View more