Hi, I was installing FreeIPA on REDHAT 6.7. I used yum install ipa-server and then ipa-server-install. But the ipa-server-install failed with below error, can anyone give some advice on why could be the root cause? Thanks ahead. [3/21]: configuring certificate server instanceipa : CRITICAL failed to configure ca instance Command '/usr/bin/perl /usr/bin/pkisilent ConfigureCA -cs_hostname esgyn001.gynsh.cn -cs_port 9445 -client_certdb_dir /tmp/tmp-V62uAl -client_certdb_pwd XXXXXXXX -preop_pin HfDrsgIoH09wCuOeHspb -domain_name IPA -admin_user admin -admin_email root@localhost -admin_password XXXXXXXX -agent_name ipa-ca-agent -agent_key_size 2048 -agent_key_type rsa -agent_cert_subject CN=ipa-ca-agent,O=GYNSH.CN -ldap_host esgyn001.gynsh.cn -ldap_port 7389 -bind_dn cn=Directory Manager -bind_password XXXXXXXX -base_dn o=ipaca -db_name ipaca -key_size 2048 -key_type rsa -key_algorithm SHA256withRSA -save_p12 true -backup_pwd XXXXXXXX -subsystem_name pki-cad -token_name internal -ca_subsystem_cert_subject_name CN=CA Subsystem,O=GYNSH.CN -ca_subsystem_cert_subject_name CN=CA Subsystem,O=GYNSH.CN -ca_ocsp_cert_subject_name CN=OCSP Subsystem,O=GYNSH.CN -ca_server_cert_subject_name CN=esgyn001.gynsh.cn,O=GYNSH.CN -ca_audit_signing_cert_subject_name CN=CA Audit,O=GYNSH.CN -ca_sign_cert_subject_name CN=Certificate Authority,O=GYNSH.CN -external false -clone false' returned non-zero exit status 255Configuration of CA failed 2018-01-18T06:55:06Z CRITICAL failed to configure ca instance Command '/usr/bin/perl /usr/bin/pkisilent ConfigureCA -cs_hostname esgyn001.gynsh.cn -cs_port 9445 -client_certdb_dir /tmp/tmp-bQZ26x -client_certdb_pwd XXXXXXXX -preop_pin LyMFcx8VY5OuwdRqnBe8 -domain_name IPA -admin_user admin -admin_email root@localhost -admin_password XXXXXXXX -agent_name ipa-ca-agent -agent_key_size 2048 -agent_key_type rsa -agent_cert_subject CN=ipa-ca-agent,O=GYNSH.CN -ldap_host esgyn001.gynsh.cn -ldap_port 7389 -bind_dn cn=Directory Manager -bind_password XXXXXXXX -base_dn o=ipaca -db_name ipaca -key_size 2048 -key_type rsa -key_algorithm SHA256withRSA -save_p12 true -backup_pwd XXXXXXXX -subsystem_name pki-cad -token_name internal -ca_subsystem_cert_subject_name CN=CA Subsystem,O=GYNSH.CN -ca_subsystem_cert_subject_name CN=CA Subsystem,O=GYNSH.CN -ca_ocsp_cert_subject_name CN=OCSP Subsystem,O=GYNSH.CN -ca_server_cert_subject_name CN=esgyn001.gynsh.cn,O=GYNSH.CN -ca_audit_signing_cert_subject_name CN=CA Audit,O=GYNSH.CN -ca_sign_cert_subject_name CN=Certificate Authority,O=GYNSH.CN -external false -clone false' returned non-zero exit status 2552018-01-18T06:55:06Z INFO File "/usr/lib/python2.6/site-packages/ipaserver/install/installutils.py", line 614, in run_script return_value = main_function() File "/usr/sbin/ipa-server-install", line 947, in main subject_base=options.subject) File "/usr/lib/python2.6/site-packages/ipaserver/install/cainstance.py", line 626, in configure_instance self.start_creation(runtime=210) File "/usr/lib/python2.6/site-packages/ipaserver/install/service.py", line 358, in start_creation method() File "/usr/lib/python2.6/site-packages/ipaserver/install/cainstance.py", line 890, in __configure_instance raise RuntimeError('Configuration of CA failed') 2018-01-18T06:55:06Z INFO The ipa-server-install command failed, exception: RuntimeError: Configuration of CA failed