Thanks David. I installed both the master and replica IPA servers with
third-party certificates(Verisign), but I doubt that could be the issue,
because I had no problem to run the same ipa-client-install command on a
RHEL7 machine(of course, the --hostname used a different hostname of the
server). And I had no problem to run the ipa-client-install command with
--server=<master> on such RHEL6 machine. So what could cause the LDAP
communication failed during the client enrollment with the replica? Is
there a way I can troubleshoot this by running some commands? So far I did
telnet to check the open ports, as well as run the ldapsearch towards the
replica. Thanks again!


On Tue, Dec 13, 2016 at 8:46 AM, David Kupka <dku...@redhat.com> wrote:

> On 13/12/16 05:44, beeth beeth wrote:
>
>> I have two IPA servers ipaprd1.example.com and ipaprd2.example.com,
>> running
>> ipa 4.4 on RHEL7. When I tried to install/configure the client on a RHEL6
>> system(called ipadev6), I had issue when I tried to enroll it with the
>> replica(ipaprd2), while no issue with the primary(ipaprd1):
>>
>> # ipa-client-install --domain=ipa.example.com --server=
>> ipaprd1.example.com
>> --server=ipaprd2.example.com --hostname=ipadev6.example.com
>> LDAP Error: Protocol error: unsupported extended operation
>> Autodiscovery of servers for failover cannot work with this configuration.
>> If you proceed with the installation, services will be configured to
>> always
>> access the discovered server for all operations and will not fail over to
>> other servers in case of failure.
>> Proceed with fixed values and no DNS discovery? [no]
>>
>> Then I tried to run ipa-client-install to enroll with the
>> replica(ipaprd2),
>> with debug mode, I got this:
>>
>> # ipa-client-install --domain=ipa.example.com --server=
>> ipaprd2.example.com
>>  --hostname=ipadev6.example.com -d
>> /usr/sbin/ipa-client-install was invoked with options: {'domain': '
>> ipa.example.com', 'force': False, 'realm_name': None,
>> 'krb5_offline_passwords': True, 'primary': False, 'mkhomedir': False,
>> 'create_sshfp': True, 'conf_sshd': True, 'conf_ntp': True, 'on_master':
>> False, 'ntp_server': None, 'nisdomain': None, 'no_nisdomain': False,
>> 'principal': None, 'hostname': 'ipadev6.example.com', 'no_ac': False,
>> 'unattended': None, 'sssd': True, 'trust_sshfp': False, 'kinit_attempts':
>> 5, 'dns_updates': False, 'conf_sudo': True, 'conf_ssh': True,
>> 'force_join':
>> False, 'ca_cert_file': None, 'server': ['ipaprd2.example.com'],
>> 'prompt_password': False, 'permit': False, 'debug': True, 'preserve_sssd':
>> False, 'uninstall': False}
>> missing options might be asked for interactively later
>> Loading Index file from '/var/lib/ipa-client/sysrestore/sysrestore.index'
>> Loading StateFile from '/var/lib/ipa-client/sysrestore/sysrestore.state'
>> [IPA Discovery]
>> Starting IPA discovery with domain=ipa.example.com, servers=['
>> ipaprd2.example.com'], hostname=ipadev6.example.com
>> Server and domain forced
>> [Kerberos realm search]
>> Search DNS for TXT record of _kerberos.ipa.example.com.
>> No DNS record found
>> Search DNS for SRV record of _kerberos._udp.ipa.example.com.
>> No DNS record found
>> SRV record for KDC not found! Domain: ipa.example.com
>> [LDAP server check]
>> Verifying that ipaprd2.example.com (realm None) is an IPA server
>> Init LDAP connection with: ldap://ipaprd2.example.com:389
>> LDAP Error: Protocol error: unsupported extended operation
>> Discovery result: UNKNOWN_ERROR; server=None, domain=ipa.example.com,
>> kdc=None, basedn=None
>> Validated servers:
>> will use discovered domain: ipa.example.com
>> IPA Server not found
>> [IPA Discovery]
>> Starting IPA discovery with domain=ipa.example.com, servers=['
>> ipaprd2.example.com'], hostname=ipadev6.example.com
>> Server and domain forced
>> [Kerberos realm search]
>> Search DNS for TXT record of _kerberos.ipa.example.com.
>> No DNS record found
>> Search DNS for SRV record of _kerberos._udp.ipa.example.com.
>> No DNS record found
>> SRV record for KDC not found! Domain: ipa.example.com
>> [LDAP server check]
>> Verifying that ipaprd2.example.com (realm None) is an IPA server
>> Init LDAP connection with: ldap://ipaprd2.example.com:389
>> LDAP Error: Protocol error: unsupported extended operation
>> Discovery result: UNKNOWN_ERROR; server=None, domain=ipa.example.com,
>> kdc=None, basedn=None
>> Validated servers:
>> Failed to verify that ipaprd2.example.com is an IPA Server.
>> This may mean that the remote server is not up or is not reachable due to
>> network or firewall settings.
>> Please make sure the following ports are opened in the firewall settings:
>>      TCP: 80, 88, 389
>>      UDP: 88 (at least one of TCP/UDP ports 88 has to be open)
>> Also note that following ports are necessary for ipa-client working
>> properly after enrollment:
>>      TCP: 464
>>      UDP: 464, 123 (if NTP enabled)
>> (ipaprd2.example.com: Provided as option)
>> Installation failed. Rolling back changes.
>> IPA client is not configured on this system.
>>
>>
>> I double checked the services running on the replica, all looked well:
>> ports are listening, and I could telnet the ports from the
>> client(ipadev6).
>> I could run "ldapserach" command to talk to the replica(ipaprd2) from this
>> client(ipadev6), with pulling out all the LDAP records.
>>
>> Also, I have another test box running RHEL7, and no issue at all to run
>> the
>> exact same ipa-client-install command on that RHEL7 box. So could there be
>> a bug on the ipa-client software on RHEL6, to talk to IPA sever running on
>> RHEL7? Please advise. Thank you!
>>
>> Best regards,
>> Beeth
>>
>>
>>
>> Hello Beeth,
> I've tried to reproduce the problem you described with 7.3 (ipa-server
> 4.4.0-12) on master and replica and 6.9 (ipa-client 3.0.0-51) on client and
> it worked for me as expected.
> I've done these steps:
> [master] # ipa-server-install -a Secret123 -p Secret123 --domain
> example.test --realm EXAMPLE.TEST --setup-dns --auto-forwarders -U
> [replica] # ipa-client-install -p admin -w Secret123 --domain example.test
> --server master.example.test -U
> [replica] # ipa-replica-install
> [client] # ipa-client-install -p admin -w Secret123 --domain example.test
> --server replica.example.test -U
> [client] # id admin
>
> Is there anything you've done differently?
>
> --
> David Kupka
>
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