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Description of problem: Observed that on registering a rhel6.10 machine (which has no hostname set for ipv6 ) rhsm.log throws the error 2018-03-12 11:49:27,892 [ERROR] subscription-manager:27612:MainThread @hwprobe.py:649 - Error during resolving IPv6 address of hostname: dhcp148-149.mpc.lab.eng.bos.redhat.com, [Errno -2] Name or service not known Version-Release number of selected component (if applicable): # subscription-manager version server type: Red Hat Subscription Management subscription management server: 2.2.2-1 subscription management rules: 5.26 subscription-manager: 1.20.10-3.git.0.05d130a.el6 How reproducible: always Steps to Reproduce: 1.on a guest machine ( which does not have a hostname set for ipv6 ) register to stage 2.watch rhsm.log for error [root@dhcp148-149 ~]# subscription-manager identity system identity: 09fce7dd-da28-4bac-826f-fa6ac91ff88c name: dhcp148-149.mpc.lab.eng.bos.redhat.com org name: 11359491 org ID: 11359491 [root@dhcp148-149 ~]# [root@dhcp148-149 ~]# subscription-manager facts | grep eth0.ipv net.interface.eth0.ipv4_address: 10.16.148.149 net.interface.eth0.ipv4_address_list: 10.16.148.149 net.interface.eth0.ipv4_broadcast: 10.16.151.255 net.interface.eth0.ipv4_broadcast_list: 10.16.151.255 net.interface.eth0.ipv4_netmask: 21 net.interface.eth0.ipv4_netmask_list: 21 net.interface.eth0.ipv6_address.global: 2620:52:0:1097:5054:ff:fe9f:72ea net.interface.eth0.ipv6_address.global_list: 2620:52:0:1097:5054:ff:fe9f:72ea net.interface.eth0.ipv6_address.link: fe80::5054:ff:fe9f:72ea net.interface.eth0.ipv6_address.link_list: fe80::5054:ff:fe9f:72ea net.interface.eth0.ipv6_netmask.global: 64 net.interface.eth0.ipv6_netmask.global_list: 64 net.interface.eth0.ipv6_netmask.link: 64 net.interface.eth0.ipv6_netmask.link_list: 64 [root@dhcp148-149 ~]# hostname --all-fqdn dhcp148-149.mpc.lab.eng.bos.redhat.com [root@dhcp148-149 ~]# [root@dhcp148-149 ~]# host 2620:52:0:1097:5054:ff:fe9f:72ea Host a.e.2.7.f.9.e.f.f.f.0.0.4.5.0.5.7.9.0.1.0.0.0.0.2.5.0.0.0.2.6.2.ip6.arpa not found: 3(NXDOMAIN) [root@dhcp148-149 ~]# [root@dhcp148-149 ~]# host 10.16.148.149 149.148.16.10.in-addr.arpa domain name pointer dhcp148-149.mpc.lab.eng.bos.redhat.com. . Actual results: the registration is successful with a Error message in rhsm.log , Expected results: no error Additional info: sharing my findings from the little bit of troubleshooting i did hope this helps.I see that on a host machine that has host name set for both ipv4 and ipv6 doesnt throw any error message [root@hp-dl360g5-01 ~]# subscription-manager facts | grep br0.ipv net.interface.br0.ipv4_address: 10.16.144.61 net.interface.br0.ipv4_address_list: 10.16.144.61 net.interface.br0.ipv4_broadcast: 10.16.151.255 net.interface.br0.ipv4_broadcast_list: 10.16.151.255 net.interface.br0.ipv4_netmask: 21 net.interface.br0.ipv4_netmask_list: 21 net.interface.br0.ipv6_address.global: 2620:52:0:1097:f6ce:46ff:feb3:59fe net.interface.br0.ipv6_address.global_list: 2620:52:0:1097:f6ce:46ff:feb3:59fe net.interface.br0.ipv6_address.link: fe80::f6ce:46ff:feb3:59fe net.interface.br0.ipv6_address.link_list: fe80::f6ce:46ff:feb3:59fe net.interface.br0.ipv6_netmask.global: 64 net.interface.br0.ipv6_netmask.global_list: 64 net.interface.br0.ipv6_netmask.link: 64 net.interface.br0.ipv6_netmask.link_list: 64 net.interface.virbr0.ipv4_address: 192.168.122.1 net.interface.virbr0.ipv4_address_list: 192.168.122.1 net.interface.virbr0.ipv4_broadcast: 192.168.122.255 net.interface.virbr0.ipv4_broadcast_list: 192.168.122.255 net.interface.virbr0.ipv4_netmask: 24 net.interface.virbr0.ipv4_netmask_list: 24 [root@hp-dl360g5-01 ~]# host 2620:52:0:1097:f6ce:46ff:feb3:59fe e.f.9.5.3.b.e.f.f.f.6.4.e.c.6.f.7.9.0.1.0.0.0.0.2.5.0.0.0.2.6.2.ip6.arpa domain name pointer hp-dl360g5-01.mpc.lab.eng.bos.redhat.com. [root@hp-dl360g5-01 ~]# [root@hp-dl360g5-01 ~]# host 10.16.144.61 61.144.16.10.in-addr.arpa domain name pointer hp-dl360g5-01.mpc.lab.eng.bos.redhat.com. rhsm.log from the guest machine ============================== 2018-03-12 11:49:24,253 [INFO] subscription-manager:27612:MainThread @managercli.py:452 - X-Correlation-ID: 06b66e93d52c4e22acfd347186a159b8 2018-03-12 11:49:24,253 [INFO] subscription-manager:27612:MainThread @managercli.py:341 - Client Versions: {'subscription-manager': '1.20.10-3.git.0.05d130a.el6'} 2018-03-12 11:49:24,255 [INFO] subscription-manager:27612:MainThread @connection.py:868 - Connection built: host=subscription.rhsm.stage.redhat.com port=443 handler=/subscription auth=identity_cert ca_dir=/etc/rhsm/ca/ insecure=False 2018-03-12 11:49:24,256 [INFO] subscription-manager:27612:MainThread @connection.py:868 - Connection built: host=subscription.rhsm.stage.redhat.com port=443 handler=/subscription auth=none 2018-03-12 11:49:24,256 [INFO] subscription-manager:27612:MainThread @managercli.py:341 - Client Versions: {'subscription-manager': '1.20.10-3.git.0.05d130a.el6'} 2018-03-12 11:49:24,294 [INFO] subscription-manager:27612:MainThread @managercli.py:317 - Consumer Identity name=None uuid=None 2018-03-12 11:49:24,299 [INFO] subscription-manager:27612:MainThread @managercli.py:317 - Consumer Identity name=None uuid=None Registering to: subscription.rhsm.stage.redhat.com:443/subscription 2018-03-12 11:49:24,300 [INFO] subscription-manager:27612:MainThread @connection.py:868 - Connection built: host=subscription.rhsm.stage.redhat.com port=443 handler=/subscription auth=basic username=stage_test_rhel74 2018-03-12 11:49:27,186 [INFO] subscription-manager:27612:MainThread @connection.py:586 - Response: status=200, requestUuid=257cdea9-b7ac-4ee0-b75a-6a52972fae76, request="GET /subscription/users/stage_test_rhel74/owners" 2018-03-12 11:49:27,644 [INFO] subscription-manager:27612:MainThread @connection.py:586 - Response: status=200, request="GET /subscription/" 2018-03-12 11:49:27,892 [ERROR] subscription-manager:27612:MainThread @hwprobe.py:649 - Error during resolving IPv6 address of hostname: dhcp148-149.mpc.lab.eng.bos.redhat.com, [Errno -2] Name or service not known