Yes, IPv6 was enabled before. Now I think it has been disabled.

output of  "vdsClient -s 0 getVdsCaps":

[root@node ~]# vdsClient -s 0 getVdsCaps
        HBAInventory = {'FC': [], 'iSCSI': [{'InitiatorName': 
'iqn.1994-05.com.redhat:2bcb704cbce4'}]}
        ISCSIInitiatorName = 'iqn.1994-05.com.redhat:2bcb704cbce4'
        additionalFeatures = []
        autoNumaBalancing = 0
        bondings = {'bond0': {'active_slave': '',
                              'addr': '',
                              'cfg': {'BONDING_OPTS': 'mode=0', 'BOOTPROTO': 
'none'},
                              'dhcpv4': False,
                              'dhcpv6': False,
                              'gateway': '',
                              'hwaddr': 'd2:96:d0:98:31:62',
                              'ipv4addrs': [],
                              'ipv6addrs': [],
                              'ipv6autoconf': True,
                              'ipv6gateway': '::',
                              'mtu': '1500',
                              'netmask': '',
                              'opts': {'mode': '0'},
                              'slaves': [],
                              'switch': 'legacy'}}
        bridges = {}
        clusterLevels = ['3.5', '3.6', '4.0']
        cpuCores = '4'
        cpuFlags = 
'fpu,vme,de,pse,tsc,msr,pae,mce,cx8,apic,sep,mtrr,pge,mca,cmov,pat,pse36,clflush,dts,acpi,mmx,fxsr,sse,sse2,ss,ht,tm,pbe,syscall,nx,pdpe1gb,rdtscp,lm,constant_tsc,arch_perfmon,pebs,bts,rep_good,nopl,xtopology,nonstop_tsc,aperfmperf,eagerfpu,pni,pclmulqdq,dtes64,monitor,ds_cpl,vmx,smx,est,tm2,ssse3,cx16,xtpr,pdcm,pcid,dca,sse4_1,sse4_2,x2apic,popcnt,tsc_deadline_timer,aes,xsave,avx,f16c,rdrand,lahf_lm,ida,arat,epb,pln,pts,dtherm,tpr_shadow,vnmi,flexpriority,ept,vpid,fsgsbase,smep,erms,xsaveopt,model_Nehalem,model_Conroe,model_coreduo,model_core2duo,model_Penryn,model_IvyBridge,model_Westmere,model_n270,model_SandyBridge'
        cpuModel = 'Intel(R) Xeon(R) CPU E5-1620 v2 @ 3.70GHz'
        cpuSockets = '1'
        cpuSpeed = '2324.496'
        cpuThreads = '8'
        dnss = ['140.207.198.6']
        emulatedMachines = ['pc-i440fx-rhel7.1.0',
                            'rhel6.3.0',
                            'pc-q35-rhel7.2.0',
                            'pc-i440fx-rhel7.0.0',
                            'rhel6.1.0',
                            'rhel6.6.0',
                            'rhel6.2.0',
                            'pc',
                            'pc-q35-rhel7.0.0',
                            'pc-q35-rhel7.1.0',
                            'q35',
                            'pc-i440fx-rhel7.2.0',
                            'rhel6.4.0',
                            'rhel6.0.0',
                            'rhel6.5.0']
        guestOverhead = '65'
        hooks = {'before_device_create': {'50_vmfex': {'md5': 
'e05994261acaea7dcf4b88ea0e81f1f5'}},
                 'before_device_migrate_destination': {'50_vmfex': {'md5': 
'e05994261acaea7dcf4b88ea0e81f1f5'}},
                 'before_nic_hotplug': {'50_vmfex': {'md5': 
'e05994261acaea7dcf4b88ea0e81f1f5'}},
                 'before_vm_start': {'50_hostedengine': {'md5': 
'2a6d96c26a3599812be6cf1a13d9f485'}}}
        hostdevPassthrough = 'false'
        kdumpStatus = 0
        kernelArgs = 'BOOT_IMAGE=/vmlinuz-3.10.0-327.22.2.el7.x86_64 
root=UUID=de9c1960-b3a0-435c-9e77-05b08ebda832 ro crashkernel=auto rhgb quiet 
LANG=en_US.UTF-8'
        kvmEnabled = 'true'
        lastClient = '::1'
        lastClientIface = 'lo'
        liveMerge = 'true'
        liveSnapshot = 'true'
        memSize = '31907'
        netConfigDirty = 'False'
        networks = {}
        nics = {'enp6s0f0': {'addr': '192.168.128.60',
                             'cfg': {'BOOTPROTO': 'none',
                                     'DEFROUTE': 'yes',
                                     'DEVICE': 'enp6s0f0',
                                     'IPADDR': '192.168.128.60',
                                     'IPV4_FAILURE_FATAL': 'no',
                                     'IPV6INIT': 'no',
                                     'NAME': 'enp6s0f0',
                                     'NETMASK': '255.255.255.0',
                                     'ONBOOT': 'yes',
                                     'PEERDNS': 'yes',
                                     'PEERROUTES': 'yes',
                                     'TYPE': 'Ethernet',
                                     'UUID': 
'64215e21-e12e-4a2b-9c1e-3e636df61487'},
                             'dhcpv4': False,
                             'dhcpv6': False,
                             'gateway': '',
                             'hwaddr': '00:1e:67:a5:1b:ee',
                             'ipv4addrs': ['192.168.128.60/24'],
                             'ipv6addrs': [],
                             'ipv6autoconf': True,
                             'ipv6gateway': '::',
                             'mtu': '1500',
                             'netmask': '255.255.255.0',
                             'speed': 1000},
                'enp6s0f1': {'addr': '192.168.1.60',
                             'cfg': {'BOOTPROTO': 'none',
                                     'DEFROUTE': 'yes',
                                     'DEVICE': 'enp6s0f1',
                                     'GATEWAY': '192.168.1.1',
                                     'IPADDR': '192.168.1.60',
                                     'IPV4_FAILURE_FATAL': 'no',
                                     'IPV6INIT': 'no',
                                     'NAME': 'enp6s0f1',
                                     'NETMASK': '255.255.255.0',
                                     'ONBOOT': 'yes',
                                     'PEERDNS': 'yes',
                                     'PEERROUTES': 'yes',
                                     'TYPE': 'Ethernet',
                                     'UUID': 
'8e62460f-69fe-4d5d-8e53-1aad1c1b8eac'},
                             'dhcpv4': False,
                             'dhcpv6': False,
                             'gateway': '192.168.1.1',
                             'hwaddr': '00:1e:67:a5:1b:ef',
                             'ipv4addrs': ['192.168.1.60/24'],
                             'ipv6addrs': [],
                             'ipv6autoconf': True,
                             'ipv6gateway': '::',
                             'mtu': '1500',
                             'netmask': '255.255.255.0',
                             'speed': 1000},
                'enp6s0f2': {'addr': '',
                             'cfg': {'BOOTPROTO': 'dhcp',
                                     'DEFROUTE': 'yes',
                                     'DEVICE': 'enp6s0f2',
                                     'IPV4_FAILURE_FATAL': 'no',
                                     'IPV6INIT': 'yes',
                                     'IPV6_AUTOCONF': 'yes',
                                     'IPV6_DEFROUTE': 'yes',
                                     'IPV6_FAILURE_FATAL': 'no',
                                     'IPV6_PEERDNS': 'yes',
                                     'IPV6_PEERROUTES': 'yes',
                                     'NAME': 'enp6s0f2',
                                     'ONBOOT': 'no',
                                     'PEERDNS': 'yes',
                                     'PEERROUTES': 'yes',
                                     'TYPE': 'Ethernet',
                                     'UUID': 
'0c0c99dc-6221-4f5c-b538-6d351601ceb2'},
                             'dhcpv4': False,
                             'dhcpv6': False,
                             'gateway': '',
                             'hwaddr': '00:1e:67:a5:1b:f0',
                             'ipv4addrs': [],
                             'ipv6addrs': [],
                             'ipv6autoconf': True,
                             'ipv6gateway': '::',
                             'mtu': '1500',
                             'netmask': '',
                             'speed': 0},
                'enp6s0f3': {'addr': '',
                             'cfg': {'BOOTPROTO': 'dhcp',
                                     'DEFROUTE': 'yes',
                                     'DEVICE': 'enp6s0f3',
                                     'IPV4_FAILURE_FATAL': 'no',
                                     'IPV6INIT': 'yes',
                                     'IPV6_AUTOCONF': 'yes',
                                     'IPV6_DEFROUTE': 'yes',
                                     'IPV6_FAILURE_FATAL': 'no',
                                     'IPV6_PEERDNS': 'yes',
                                     'IPV6_PEERROUTES': 'yes',
                                     'NAME': 'enp6s0f3',
                                     'ONBOOT': 'no',
                                     'PEERDNS': 'yes',
                                     'PEERROUTES': 'yes',
                                     'TYPE': 'Ethernet',
                                     'UUID': 
'b43115e5-9169-48b4-bd6e-2c384ed8bc2a'},
                             'dhcpv4': False,
                             'dhcpv6': False,
                             'gateway': '',
                             'hwaddr': '00:1e:67:a5:1b:f1',
                             'ipv4addrs': [],
                             'ipv6addrs': [],
                             'ipv6autoconf': True,
                             'ipv6gateway': '::',
                             'mtu': '1500',
                             'netmask': '',
                             'speed': 0}}
        numaNodeDistance = {'0': [10]}
        numaNodes = {'0': {'cpus': [0, 1, 2, 3, 4, 5, 6, 7], 'totalMemory': 
'32689'}}
        onlineCpus = '0,1,2,3,4,5,6,7'
        operatingSystem = {'name': 'RHEL', 'release': '2.1511.el7.centos.2.10', 
'version': '7'}
        packages2 = {'glusterfs-cli': {'buildtime': 1467127942,
                                       'release': '2.el7',
                                       'version': '3.7.12'},
                     'kernel': {'buildtime': 1466672711.0,
                                'release': '327.22.2.el7.x86_64',
                                'version': '3.10.0'},
                     'librbd1': {'buildtime': 1448036424, 'release': '3.el7', 
'version': '0.80.7'},
                     'libvirt': {'buildtime': 1466692118,
                                 'release': '13.el7_2.5',
                                 'version': '1.2.17'},
                     'mom': {'buildtime': 1464686497,
                             'release': '1.el7.centos',
                             'version': '0.5.4'},
                     'qemu-img': {'buildtime': 1461573104,
                                  'release': '31.el7_2.10.1',
                                  'version': '2.3.0'},
                     'qemu-kvm': {'buildtime': 1461573104,
                                  'release': '31.el7_2.10.1',
                                  'version': '2.3.0'},
                     'spice-server': {'buildtime': 1465308266,
                                      'release': '15.el7_2.1',
                                      'version': '0.12.4'},
                     'vdsm': {'buildtime': 1466710303,
                              'release': '0.el7.centos',
                              'version': '4.18.4.1'}}
        reservedMem = '321'
        rngSources = ['random']
        selinux = {'mode': '1'}
        software_revision = '0'
        software_version = '4.18'
        supportedENGINEs = ['3.5', '3.6', '4.0']
        supportsIPv6 = True
        uuid = '617DC761-B9B4-E311-AF6C-001E67A51BEE'
        version_name = 'Snow Man'
        vlans = {}
        vmTypes = ['kvm']
 
From: Roy Golan
Date: 2016-07-05 14:30
To: qinglong.d...@horebdata.cn
CC: users
Subject: Re: Re: [ovirt-users] ovirt 4.0 hosted engine deploy

On Tue, Jul 5, 2016 at 5:37 AM, qinglong.d...@horebdata.cn 
<qinglong.d...@horebdata.cn> wrote:
Reactor thread::INFO::2016-07-04 
17:52:04,607::protocoldetector::72::ProtocolDetector.AcceptorImpl::(handle_accept)
 Accepting connection from ::1:45016

I see you are getting connections from IPv6 and I think it should be disabled. 
Make sure you follow the vdsm install guidelines. 

Also can you share the output of 
```bash
vdsClient -s 0 getVdsCaps
```



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