<div dir="ltr">Thank you Petr! I found the problem, but quite by accident... There may be a Best Practice at hand that I wasn't aware of... I still have the Windows AD server sitting on the side, serving as DHCP server and waiting patiently for my Cross Realm Trust; That server will forward DNS requests to the IPA server, and return a non-authoritative answer. Occasionally, that server will seemingly loose track of the IPA server, and stop returning results... And that happened while I was trying to follow through with your request for info... So as a quick work around, I simply dropped the AD server from my resolv.conf... And then performed your requests, without errors. I ran the DNS Update from the ipa-server-install script, and that worked without errors. I added the AD server back into resolv.conf, and everything failed again. I put the AD server as the SECOND name server in resolv.conf, and the errors went away. So I've clearly identified the problem. I uninstalled the client, and reinstalled the client, and everything went cleanly. To prevent this problem in the future... I will be changing the DHCP options to list the IPA DNS first for the Linux clients, and the AD DNS first for Windows clients; I still want the AD DNS server in the list, as a fallback. Is this plan the best practice here? </div><div class="gmail_extra"> <div class="gmail_quote">On Wed, Oct 26, 2016 at 11:36 PM, Petr Spacek <<a href="mailto:pspacek@redhat.com" target="_blank">pspacek@redhat.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="HOEnZb"><div class="h5">On 27.10.2016 04:43, Tyrell Jentink wrote: >> 2016-10-26T23:30:40Z DEBUG Writing nsupdate commands to >> > /etc/ipa/.dns_update.txt: >> > 2016-10-26T23:30:40Z DEBUG debug >> > >> > update delete <a href="http://trainmaster.ipa.rxrhouse.net" rel="noreferrer" target="_blank">trainmaster.ipa.rxrhouse.net</a>. IN A >> > show >> > send >> > >> > update delete <a href="http://trainmaster.ipa.rxrhouse.net" rel="noreferrer" target="_blank">trainmaster.ipa.rxrhouse.net</a>. IN AAAA >> > show >> > send >> > >> > update add <a href="http://trainmaster.ipa.rxrhouse.net" rel="noreferrer" target="_blank">trainmaster.ipa.rxrhouse.net</a>. 1200 IN A 10.42.0.100 >> > show >> > send >> > >> > 2016-10-26T23:30:40Z DEBUG Starting external process >> > 2016-10-26T23:30:40Z DEBUG args=/usr/bin/nsupdate -g >> > /etc/ipa/.dns_update.txt >> > 2016-10-26T23:30:40Z DEBUG Process finished, return code=1 >> > 2016-10-26T23:30:40Z DEBUG stdout=Outgoing update query: >> > ;; ->>HEADER<<- opcode: UPDATE, status: NOERROR, id: 0 >> > ;; flags:; ZONE: 0, PREREQ: 0, UPDATE: 0, ADDITIONAL: 0 >> > ;; UPDATE SECTION: >> > <a href="http://trainmaster.ipa.rxrhouse.net" rel="noreferrer" target="_blank">trainmaster.ipa.rxrhouse.net</a>. 0 ANY A >> > >> > Outgoing update query: >> > ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 39562 >> > ;; flags:; QUESTION: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1 >> > ;; QUESTION SECTION: >> > ;<a href="http://3107127915.sig-ipa-pdc.ipa.rxrhouse.net" rel="noreferrer" target="_blank">3107127915.sig-ipa-pdc.ipa.rxrhouse.net</a>. ANY TKEY >> > >> > ;; ADDITIONAL SECTION: >> > <a href="http://3107127915.sig-ipa-pdc.ipa.rxrhouse.net" rel="noreferrer" target="_blank">3107127915.sig-ipa-pdc.ipa.rxrhouse.net</a>. 0 ANY TKEY gss-tsig. 1477524640 </div></div>[...] <div><div class="h5">>> > >> > 2016-10-26T23:30:40Z DEBUG stderr=Reply from SOA query: >> > ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 38738 >> > ;; flags: qr aa rd ra; QUESTION: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 >> > ;; QUESTION SECTION: >> > ;<a href="http://trainmaster.ipa.rxrhouse.net" rel="noreferrer" target="_blank">trainmaster.ipa.rxrhouse.net</a>. IN SOA >> > >> > ;; AUTHORITY SECTION: >> > <a href="http://ipa.rxrhouse.net" rel="noreferrer" target="_blank">ipa.rxrhouse.net</a>. 0 IN SOA <a href="http://ipa-pdc.ipa.rxrhouse.net" rel="noreferrer" target="_blank">ipa-pdc.ipa.rxrhouse.net</a>. >> > <a href="http://hostmaster.ipa.rxrhouse.net" rel="noreferrer" target="_blank">hostmaster.ipa.rxrhouse.net</a>. 1477524446 3600 900 1209600 3600 >> > >> > Found zone name: <a href="http://ipa.rxrhouse.net" rel="noreferrer" target="_blank">ipa.rxrhouse.net</a> >> > The master is: <a href="http://ipa-pdc.ipa.rxrhouse.net" rel="noreferrer" target="_blank">ipa-pdc.ipa.rxrhouse.net</a> >> > start_gssrequest >> > Found realm from ticket: <a href="http://IPA.RXRHOUSE.NET" rel="noreferrer" target="_blank">IPA.RXRHOUSE.NET</a> >> > send_gssrequest >> > recvmsg reply from GSS-TSIG query >> > ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 39562 >> > ;; flags: qr; QUESTION: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 >> > ;; QUESTION SECTION: >> > ;<a href="http://3107127915.sig-ipa-pdc.ipa.rxrhouse.net" rel="noreferrer" target="_blank">3107127915.sig-ipa-pdc.ipa.rxrhouse.net</a>. ANY TKEY >> > >> > ;; ANSWER SECTION: >> > <a href="http://3107127915.sig-ipa-pdc.ipa.rxrhouse.net" rel="noreferrer" target="_blank">3107127915.sig-ipa-pdc.ipa.rxrhouse.net</a>. 0 ANY TKEY gss-tsig. 1466301805 >> > 1466388205 3 NOERROR 101 >> > YGMGCSqGSIb3EgECAgMAflQwUqADAgEFoQMCAR6kERgPMjAxNjA2MTkw >> > MjAzMjVapQUCAwHGkaYDAgEpqREbD0FELlJYUkhPVVNFLk5FVKoUMBKg >> > AwIBAaELMAkbB2FkLXBkYyQ= >> > 0 >> > >> > dns_tkey_negotiategss: failure GSSAPI error: Major = Unspecified GSS >> > failure. Minor code may provide more information, Minor = Message stream >> > modified. >> > >> > 2016-10-26T23:30:40Z DEBUG nsupdate failed: Command '/usr/bin/nsupdate -g >> > /etc/ipa/.dns_update.txt' returned non-zero exit status 1 >> > 2016-10-26T23:30:40Z ERROR Failed to update DNS records. >> > 2016-10-26T23:30:40Z DEBUG DNS resolver: Query: >> > <a href="http://trainmaster.ipa.rxrhouse.net" rel="noreferrer" target="_blank">trainmaster.ipa.rxrhouse.net</a> IN A >> > 2016-10-26T23:30:40Z DEBUG DNS resolver: No record. >> > 2016-10-26T23:30:40Z DEBUG DNS resolver: Query: >> > <a href="http://trainmaster.ipa.rxrhouse.net" rel="noreferrer" target="_blank">trainmaster.ipa.rxrhouse.net</a> IN AAAA >> > 2016-10-26T23:30:40Z DEBUG DNS resolver: No record. >> > 2016-10-26T23:30:40Z DEBUG DNS resolver: Query: 100.0.42.10.in-addr.arpa. >> > IN PTR >> > 2016-10-26T23:30:40Z DEBUG DNS resolver: No record. >> > 2016-10-26T23:30:40Z WARNING Missing A/AAAA record(s) for host >> > <a href="http://trainmaster.ipa.rxrhouse.net" rel="noreferrer" target="_blank">trainmaster.ipa.rxrhouse.net</a>: 10.42.0.100. >> > 2016-10-26T23:30:40Z WARNING Missing reverse record(s) for address(es): >> > 10.42.0.100. >> > > -- Full logs can be found here: <a href="http://pastebin.com/90dG9Ffu" rel="noreferrer" target="_blank">http://pastebin.com/90dG9Ffu</a> > </div></div>> - For grins, I decided to test: > kinit admin > id admin > getent passwd admin > on the client, and all of those all made valid responses... So > authentication is working, I just can't update DNS records. > > > So that's what I've tried, and where I'm at... My client machines running > modern client software can NOT update DNS records, complaining about GSSAPI > "Message Stream Modified" errors... And I have no idea how to troubleshoot > that... Any ideas? Interesting, I haven't seen this one :-) There is something fishy in GSSAPI negotiation between the client and DNS server. I would try this (and watch out for suspicious messages along the way): 1) To be sure, please double-check that <a href="http://ipa-pdc.ipa.rxrhouse.net" rel="noreferrer" target="_blank">ipa-pdc.ipa.rxrhouse.net</a>. resolves (from the client) to correct IP address of IPA DNS server. 2) Verify that Kerberos ticket for the DNS server can be obtained: $ kinit -k $ kvno DNS/<a href="http://ipa-pdc.ipa.rxrhouse.net" rel="noreferrer" target="_blank">ipa-pdc.ipa.rxrhouse.net</a> $ klist # it should list Kerberos ticket for <a href="http://ipa-pdc.ipa.rxrhouse.net" rel="noreferrer" target="_blank">ipa-pdc.ipa.rxrhouse.net</a> 3) Create a plain text file with update message content: cat > /tmp/dnsupdate <<<EOF debug update delete <a href="http://trainmaster.ipa.rxrhouse.net" rel="noreferrer" target="_blank">trainmaster.ipa.rxrhouse.net</a>. IN A send EOF 4) call nsupdate on it $ KRB5_TRACE=/dev/stdout nsupdate -g /tmp/dnsupdate Does it produce the same error? (It should, but with more debuginfo.) What version of server and client packages are you using? -- Petr^2 Spacek -- Manage your subscription for the Freeipa-users mailing list: <a href="https://www.redhat.com/mailman/listinfo/freeipa-users" rel="noreferrer" target="_blank">https://www.redhat.com/mailman/listinfo/freeipa-users</a> Go to <a href="http://freeipa.org" rel="noreferrer" target="_blank">http://freeipa.org</a> for more info on the project </blockquote></div> </div>