f



Cannot contact any KDC for the requested realm

Hi, 

I'm having trouble with the kerberos server again...
When I request a tgt or something for the first time it always gives
me the "Cannot contact any KDC for the requested realm", but if i make
the same request again (after a sec), all is fine.

Do you know of anything that can cause this?

Thanks.
0
noolyg (9)
11/26/2003 3:43:00 PM
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You do not have a REALM entry in your krb5.conf file for the realm
you are attempting to contact, so DNS is being used.  But the local
DNS server does not have the data and must propagate a query.  The
network has a long propagation delay and therefore the Kerberos
client times out before the response arrives.

The second time you attempt the tgt request, the local DNS server
has the response cached so the response arrives before the timeout
period.

Noolyg wrote:
> Hi, 
> 
> I'm having trouble with the kerberos server again...
> When I request a tgt or something for the first time it always gives
> me the "Cannot contact any KDC for the requested realm", but if i make
> the same request again (after a sec), all is fine.
> 
> Do you know of anything that can cause this?
> 
> Thanks.
________________________________________________
Kerberos mailing list           Kerberos@mit.edu
https://mailman.mit.edu/mailman/listinfo/kerberos

0
jaltman2 (417)
11/26/2003 8:23:46 PM
Thanks for the answer, I think you are right about the DNS, but i have
the REALM entry in the krb5.ini (windows) it looks like that:

[libdefaults]
	default_realm = MYREALM
	default_tgs_enctypes = des-cbc-crc
	default_tkt_enctypes = des-cbc-crc
	forwardable = true
	proxiable = true
[login]
	krb4_convert = false
	krb4_get_tickets = false
[realms]
	MYREALM = {
		admin_server = 172.16.13.110:88
		default_domain = sks.kerb
		kdc = 172.16.13.110:88
	}

Is there something wrong with it?
Shold i add this somewhere else?

Thanks a lot.

jaltman2@nyc.rr.com (Jeffrey Altman) wrote in message news:<3FC508B4.9090005@nyc.rr.com>...
> You do not have a REALM entry in your krb5.conf file for the realm
> you are attempting to contact, so DNS is being used.  But the local
> DNS server does not have the data and must propagate a query.  The
> network has a long propagation delay and therefore the Kerberos
> client times out before the response arrives.
> 
> The second time you attempt the tgt request, the local DNS server
> has the response cached so the response arrives before the timeout
> period.
>
0
noolyg (9)
11/27/2003 12:42:34 PM
Noolyg wrote:
> Thanks for the answer, I think you are right about the DNS, but i have
> the REALM entry in the krb5.ini (windows) it looks like that:
> 
> [libdefaults]
> 	default_realm = MYREALM
> 	default_tgs_enctypes = des-cbc-crc
> 	default_tkt_enctypes = des-cbc-crc
> 	forwardable = true
> 	proxiable = true
> [login]
> 	krb4_convert = false
> 	krb4_get_tickets = false
> [realms]
> 	MYREALM = {
> 		admin_server = 172.16.13.110:88
> 		default_domain = sks.kerb
> 		kdc = 172.16.13.110:88
> 	}
> 
> Is there something wrong with it?
> Shold i add this somewhere else?
> 
> Thanks a lot.
> 
> jaltman2@nyc.rr.com (Jeffrey Altman) wrote in message news:<3FC508B4.9090005@nyc.rr.com>...
> 
>>You do not have a REALM entry in your krb5.conf file for the realm
>>you are attempting to contact, so DNS is being used.  But the local
>>DNS server does not have the data and must propagate a query.  The
>>network has a long propagation delay and therefore the Kerberos
>>client times out before the response arrives.
>>
>>The second time you attempt the tgt request, the local DNS server
>>has the response cached so the response arrives before the timeout
>>period.
>>
This looks like your dns server has more then name tied to 172.16.13.110:88
 From the same client do a reverse lookup:
dig @<dns server address> -x 172.16.13.110   two time after each other
Does it reveal the same name ??


Rob


0
robf (2)
11/30/2003 9:41:41 PM
Reply:

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Hi: I've been having a hard time getting MIT Kerberos up and running on solaris 10. The latest of my problems is this error when i run kinit from the KDC. dsldap01$ /krb5/bin/kinit rob/admin@alezeo.com kinit(v5): Cannot resolve network address for KDC in realm alezeo.com while getting initial credentials This sounds like a DNS problem, but I don't think it is. dsldap01$ host -t A dsldap01.alezeo.com dsldap01.alezeo.com has address 10.93.120.72 Also in my hosts file: 127.0.0.1 localhost 10.93.120.72 dsldap01.alezeo.com dsldap01 loghost Here is my krb5.conf ============= [libdefaults] dns_lookup_realm = false default_realm = ALEZEO.COM ticket_lifetime = 600 kdc_req_checksum_type = 2 checksum_type = 2 ccache_type = 1 default_tkt_enctypes = des-cbc-crc default_tgs_enctypes = des-cbc-crc [kdc] profile = /krb5/var/krb5kdc/kdc.conf [logging] default = FILE:/var/krb5/kdc.log kdc = FILE:/var/krb5/kdc.log admin_server = FILE:/var/krb5/adm.log [realms] ALEZEO.COM = { kdc = dsldap01.alezeo.com:88 admin_server = dsldap01.alezeo.com:749 default_domain = alezeo.com } [domain_realm] .alezeo.com = ALEZEO.COM alezeo.com = ALEZEO.COM [login] krb4_convert = 0 Here is my kdc.conf ============ [kdcdefaults] kdc_ports = 88 [realms] alezeo.com = { ...

Re: kinit(v5): Cannot contact any KDC for requested...... #2
Thanks Jin for the tip. I tried that as well and it did not work. I've stopped using DNS to troubleshoot the problem. Here's principals list: [root@kerberos sample]# /usr/local/sbin/kadmin.local Authenticating as principal muzaffar/admin@RTDLINUX.COM with password. kadmin.local: listprincs K/M@RTDLINUX.COM host/kerberos.rtdlinux.com@RTDLINUX.COM kadmin/admin@RTDLINUX.COM kadmin/changepw@RTDLINUX.COM kadmin/history@RTDLINUX.COM krbtgt/RTDLINUX.COM@RTDLINUX.COM muzaffar/admin@RTDLINUX.COM root@RTDLINUX.COM sample/kerberos.rtdlinux.com@RTDLINUX.COM Here's output from keytab file: [root@kerberos sample]# klist -k Keytab name: FILE:/etc/krb5.keytab KVNO Principal ---- -------------------------------------------------------------------------- 4 kadmin/admin@RTDLINUX.COM 4 kadmin/admin@RTDLINUX.COM 4 kadmin/changepw@RTDLINUX.COM 4 kadmin/changepw@RTDLINUX.COM 2 host/kerberos.rtdlinux.com@RTDLINUX.COM 2 host/kerberos.rtdlinux.com@RTDLINUX.COM _________________________________________________________ Muzaffar Sultan--Telvent muzaffar.sultan@telvent.abengoa.com Ph: (403)-301-5020 |---------+------------------------------> | |xiongj@rpi.edu | | | | |---------+------------------------------> >----------------------------------------------------------------------------------------------------------------------------| | ...

Cannot resolve network address for KDC in requested realm while getting initial credentials
On Red Hat linux 2.4.9 krb5-devel-1.2.2-24 krb5-libs-1.2.2-24 krb5-server-1.2.2-24 krb5-workstation-1.2.2-24 running everything on the local host I can run kinit.just fine: kinit test Password for test@host.COM: I can create a keytab file: kadmin.local: ktadd -k /var/kerberos/krb5kdc/kadm5test test Entry for principal test with kvno 5, encryption type Triple DES cbc mode with HMAC/sha1 added to keytab WRFILE:/var/kerberos/krb5kdc/kadm5test. Entry for principal test with kvno 5, encryption type DES cbc mode with CRC-32 added to keytab WRFILE:/var/kerberos/krb5kdc/kadm5test. However, I can't kinit using this keytab file: [root@host/var/kerberos/krb5kdc]$ kinit -k kadm5test kinit(v5): Cannot resolve network address for KDC in requested realm while getting initial credentials klist shows: [root@bde-idm3 /var/kerberos/krb5kdc]$ klist Ticket cache: FILE:/tmp/krb5cc_0 Default principal: test@BDE-IDM3.US.ORACLE.COM Valid starting Expires Service principal 01/20/05 14:53:59 01/21/05 00:53:59 krbtgt/HOST.COM@HOST.COM Kerberos 4 ticket cache: /tmp/tkt0 klist: You have no tickets cached A secondary problem is now the password seems to have been changed after creating the keytab, and I can no longer kinit (without the keytab): [root@host /var/kerberos/krb5kdc]$ kinit test Password for test@host.US.ORACLE.COM: kinit(v5): Password incorrect while getting initial credentials For testing purposes I'm using my hostname as my realm name. I&#...

MIT Kerberos KDC & W2K Client: Changing expired password issueMIT Kerberos KDC & W2K Client: Changing expired password issue
Hi, I also experienced the same problem as William G.Zereneh (http://mailman.mit.edu/pipermail/kerberos/2004-May/005341.html). I'm able to change the password using ctrl-alt-del, but when the password is expired and windows asks me to change the password, I encountered "Domain MIT.REALM.COM is not available" error. As I sniff the packet, it noticed that it sent a CLDAP query message with filter: (&(DnsDomain = MIT.REALM.COM)(Host = myhostname)(NtVer=\006) which is returned NULL by my _ldap._tcp.dc._msdcs.REALM.MIT.COM How to resolve this problem ? maybe there's a missing entry in my DNS ? Is it mandatory for the MIT Kerberos KDC (I installed it on RedHat Linux) to have an LDAP service to resolve the CLDAP request ? and can LDAP actually entertains CLDAP request since LDAP is using TCP while CLDAP is using UDP ? Can I resolve the CLDAP request using Windows 2000 server instead ? Any ideas will be very appreciated Regards from newbie, lara ===== ------------------------------------------------------------------------------------ La vie, voyez-vous, ca n'est jamais si bon ni si mauvais qu'on croit - Guy de Maupassant - ------------------------------------------------------------------------------------ __________________________________ Do you Yahoo!? Friends. Fun. Try the all-new Yahoo! Messenger. http://messenger.yahoo.com/ ____________________________________...

validating keytab files: Cannot find KDC for requested realm whilegetting initial credentials
I am able to validate (test) keytab files for service1/host1.us.foo.com@FOO.COM and service2/host2.us.foo.com@FOO.COM using the command "kinit -5 -k -t keytab-file service-principal" from host1.us.foo.com, but when I try to validate a keytab file for service3/host3.au.foo.com@FOO.COM from host1.us.foo.com I get the following error: kinit(v5): Cannot find KDC for requested realm while getting initial credentials krb5.conf says: [realms] FOO.COM = { kdc = ...foo.com:88 ... } [domain_realm] .foo.com = FOO.COM Is this behavior expected? Do I need to be "on" a host in .au.foo.com to validate a keytab for service3/host3.au.foo.com@FOO.COM? Thanks. Frank -- This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden. ________________________________________________ Kerberos mailing list Kerberos@mit.edu https://mailman.mit.edu/mailman/listinfo/kerberos Check your krb5kdc.log file for any hint! Hooshang On Tue, 26 Oct 2004 16:39:22 -0400, Frank Balluffi <frank.balluffi@db.com> wrote: > I am able to validate (test) keytab files for service1/host1.us.foo.com@FOO.COM and service2/host2.us.foo.com@FOO.COM using the command "kinit -5 -k -t keytab-file se...

Re: validating keytab files: Cannot find KDC for requested realm whilegetting initial credentials
Adding "dns_lookup_kdc = true" to the [libdefaults] section of krb5.conf seems to fix the problem. Frank "Frank Balluffi" <frank.balluffi+exter To: kerberos@mit.edu nal@db.com> cc: Sent by: Subject: validating keytab files: Cannot find KDC for requested realm kerberos-bounces@mit. whilegetting initial credentials edu 10/26/2004 04:39 PM ...

kinit: Cannot contact any KDC for realm 'EXAMPLE.COM' while getting initial credentials
Hi! I have set up a kerberos server srv.example.com. This server has address 192.168.180.30. Address resolution works fine on the server and client: srv.example.com: # host srv srv.example.com has address 192.168.180.30 # host 192.168.180.30 30.180.168.192.in-addr.arpa domain name pointer srv.example.com. # host client client.example.com has address 192.168.180.6 # host 192.168.180.6 6.180.168.192.in-addr.arpa domain name pointer client.example.com # client.example.com: # host srv srv.example.com has address 192.168.180.30 # host 192.168.180.30 30.180.168.192.in-addr.arpa domain name pointer srv.example.com. # host client client.example.com has address 192.168.180.6 # host 192.168.180.6 6.180.168.192.in-addr.arpa domain name pointer client.example.com # Now from the server: # kinit user kinit: Cannot contact any KDC for realm 'EXAMPLE.COM' while getting initial credentials and from the client: # kinit user kinit: Cannot contact any KDC for realm 'EXAMPLE.COM' while getting initial credentials I am a bit lost what's going on here. In /etc/krb5.conf I have: [libdefaults] default_realm = EXAMPLE.COM dns_lookup_kdc = true dns_lookup_realm = true # The following krb5.conf variables are only for MIT Kerberos. krb4_config = /etc/krb.conf krb4_realms = /etc/krb.realms kdc_timesync = 1 ccache_type = 4 forwardable = true proxiable = true [realms] EXAMPLE.COM = { k...

AIX 5.3: kinit(v5): Cannot resolve network address for KDC in requested realm while getting initial credentials
Hi list, kinit (krb5 1.4.2) on an AIX 5.3 gives me # /usr/local/bin/kinit -k -t foobar.keytab foobar/foo.example.net@EXAMPLE.NET kinit(v5): Cannot resolve network address for KDC in requested realm while getting initial credentials From a working Linux krb5 1.4.2 installation I copied /etc/krb5.conf and foobar.keytab to AIX 5.3. The following steps don't defer to the steps I did under Linux. # ./configure --without-krb4 --enable-shared # make && make install Using gcc 3.3.2. I found a patch for krb5 1.4.1 for AIX 5.2 from Ken Raeburn, but as far as I see it is fixed in 1.4.2. My krb5.conf looks like this: [libdefaults] default_realm = EXAMPLE.NET clockskew = 300 [realms] EXAMPLE.NET = { kdc = foo.example.net:88 admin_server = foo.example.net:749 default_domain = example.net kpasswd_server = foo.example.net } [domain_realm] .example.net = EXAMPLE.NET example.net = EXAMPLE.NET [logging] default = SYSLOG:NOTICE:DAEMON kdc = FILE:/var/log/kdc.log kadmind = FILE:/var/log/kadmind.log [appdefaults] pam = { ticket_lifetime = 1d renew_lifetime = 1d forwardable = true proxiable = false retain_after_close = false minimum_uid = 0 debug = false } Trying to analyze with tcpdump I s...

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