Kerberos is a computer network authentication protocol, which allows nodes communicating over a non-secure network to prove their identity to one another in a secure manner. Its designers aimed primarily at a client–server model, and it provides mutual authentication — both the user and the server ...

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Kerberos, Active Directory, and Linux/Unix Servers

I have done some research on the topic, but I can't quite find a straight answer to my question. Please tell me if my understanding is correct. Kerberos can be used as the bridge between a ...
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1answer
927 views

Linux Client Active Directory Authentication stops working when failover

I have an issue with Linux clients trying to AD authentication by targeting a DNS name (corp.example.com). I have 2 Domain Controller servers DC1(10.0.0.3/24), DC2(10.1.0.3/24) both domain controllers ...
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2k views

Lookup Active Directory entry by implicit UPN

In our company exists a forest-wide UPN suffix company.com and almost all user accounts have the explicit UPN set to fistname.lastname@company.com. This value is also set in the Active Directory ...
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33 views

At which point becomes a changed computer group membership active?

When adding a computer object to an AD group, at which point in time does the group membership become active? Is there some kind of kerberos refresh interval (similar to group policy refresh)? I ...
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How do I get /dev/random to work on an Ubuntu virtual machine?

Apparently, /dev/random is based on hardware interrupts or similar unpredictable aspects of physical hardware. Since virtual machines don't have physical hardware, running cat /dev/random within a ...
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Authentication fails when using ARR to load balance Lync 2013 internal web services

I'm using Application Request Routing 3.0 on Windows Server 2012 R2 to load balance the internal web services on a Lync 2013 front-end pool; I'm not using it to reverse proxy the external web services ...
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1answer
29 views

Ubuntu 14.04 Active Directory auth fails after static ip config

I'm having 6 Ubuntu 14.04 servers that are joined to active directory (2003 domain functional level 2008r2 schema) All of the servers work's fine when network interface is configured to use DHCP. But ...
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2answers
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kinit: Cannot contact any KDC for realm 'UBUNTU' while getting initial credentials

I am installing Kerberos5-1.12.1 on ubuntu machine by following the link: http://techpubs.spinlocksolutions.com/dklar/kerberos.html#krb-install Whenever i am trying to do : kinit user1 I am ...
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26 views

Setting up Secure Hadoop Cluster - Kerberos security

I setup a HDP 2.2 cluster successfully (1 NM, 3 DNs and 1 client). User accounts to access HDP cluster are created in client and checked these users can submit jobs, by SSH to client node and run ...
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10 views

give serverprincipalname read write permissions to security group members

What are the settings for the group to make the following change? I need to create a group that can be used to grant: serviceprincipalname SELF Read serviceprincipalname SELF Write to its members. ...
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How does Kerberos work with SSH?

Suppose I have four computers, Laptop, Server1, Server2, Kerberos server: I log in using PuTTY or SSH from L to S1, giving my username / password From S1 I then SSH to S2. No password is needed as ...
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912 views

need help in setting up SPN for Kerberos Authentication

I am using IIS 7 for setting up a website under windows authentication. I am seeing authentication issue which i am almost sure that it is related to kerberos issue and i am wrongly setting up SPN. ...
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Client not requesting Kerberos authentication

My client is not requesting Kerberos tickets, but does when using fiddler. I was then advised not to use fiddler and use Wireshark, using this I can see that the client is sending an NTLM ...
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3answers
62 views

Alternatives to Kerberos for passwordless server access

I have a bunch of Linux servers and three Windows servers 2008 R2. I would need a solution which would enable passwordless SSH login from each of those servers to all others. I could do this by ...
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13 views

Establish FAST encrypted channel between linux client and windows server

I am trying to setup windows server for FAST encrypted channel support to test OTP pre authentication in kerberos. I have already tested on linux machine by deploying KDC using krb5-1.12.1 source ...
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2answers
906 views

Problem with testsaslauthd and kerberos5 (“saslauthd internal error”)

The error message “saslauthd internal error” seems like a catch-all for saslauthd, so I’m not sure if it’s a red herring, but here’s the brief description of my problem: This Kerberos command works ...
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1answer
11 views

kadmin cannot list principals “requires list privileges”

I can authenticate fine via kadmin however cannot list principals? [root@server ~]# kadmin -p admin Authenticating as principal admin with password. Password for admin@org.domain.com: kadmin: ...
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370 views

ADFS & WAP with SP 2013 - Login redirect to blank page

I set up ADFS and WAP on server 2012 R2 in order to login into SharePoint 2013. I follow several how-to, and all seems fine except one thing : When I log into ADFS form, its ok, then I land on a blank ...
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2answers
2k views

FreeBSD: OpenLDAP, SASL, and GSSAPI

I've run into some problems getting OpenLDAP on FreeBSD (8.2-STABLE) to authenticate using Kerberos tickets. I hope I've just had a brain glitch, so please feel free to let me know that I've missed ...
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1answer
82 views

Why is sshd engaging PAM still?

Background/Behavior is: if you ssh to box via and GSSAPI/Kerberos succeeds and you have a local user in /etc/passwd, you login fine per below PAM config. All Good there. But if you don't have a ...
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1answer
23 views

Password Delegation with Windows 2008 Server Trusts?

I have a trust setup between two Windows 2008 Active Directory forests. My domains are "local.ad" and "remote.ad". All of my corporate users belong to the remote.ad forest. I have to add the ...
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1answer
1k views

DCOM Authentication Fails to use Kerberos, Falls back to NTLM

I have a webservice that is written in Classic ASP. In this web service it attempts to create a VirtualServer.Application object on another server via DCOM. This fails with Permission Denied. However ...
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101 views

Cross-Realm trust verify failed with 'netdom' command

Question 1: Am having my ActiveDirectory in Windowsserver 2012 machine - its domain name is AD-DEMO.LOCAL Kerberos admin-server is in another Ubuntu machine - its realm KERBEROS.COM Added trust in ...
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41 views

[root@pcm-ipa-01 tmp]# klist klist: No credentials cache found (ticket cache FILE:/tmp/krb5cc_0)freeipa kadmin admin principal not found

I have installed freeipa on centos and after restarting the service seems to have lost authentication for "kadmin" [root@pcm-ipa-01 ~]# kadmin init Authenticating as principal root/admin@MY.DOMAIN T ...
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3answers
992 views

Double Hop Window Authentication

I've got a problem getting Windows Authentication (Kerberos) to work when passing credentials from the user, to IIS then from IIS to SQL. I have setup SPN's for SQL, and set the IIS server account up ...
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18 views

JBoss SPNEGO Authentication Renewing Server Kerberos Tickets

We have successfully configured SPNEGO with our webapp on JBoss EAP 6.2, Windows Server 2008, and IE10 using JBoss Negotiation. What is best operational practice for renewing the ticket issued to ...
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2answers
3k views

winbindd: kinit succeeded but ads_sasl_spnego_krb5_bind failed: Cannot contact any KDC for requested realm

While looking for reasons why logging in to a samba machines joined to Active Directory is slow I have the strong impression that the following error in my log file could be a hint. Apr 3 14:44:14 ...
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9 views

Why does the server ID need to be sent in AS-REQ?

In the kerberos protocol, in the AS-REQ, you send your username and the server you want to use. The AS doesn't seem to use the server ID in the AS-REP, and in the TGS-REQ, the client sends the ...
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1answer
1k views

How to enable Kerberos Authentication Service auditing on 2008 server

I have a 2008-level Windows domain running 5 x 2008 (non-R2) DCs (it's on the roadmap to migrate to R2 or possibly 2012 in the next 9-12 months, but this project needs to be working first), and I need ...
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2answers
1k views

Windows Server 2003 -Ktpass - crypto: enum value 'rc4-hmac' is not known

I'm trying to create a keytab with Ktpass on a Windows Server 2003 with: Ktpass -princ host/prueba-mail.ejemplo.org@EJEMPLO.ORG -mapuser host -pass password -crypto rc4-hmac -out UNIXhost.keytab I ...
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Kerberos and SQL server connection string

I am working on a project to migrate a legacy ASP program (NOT .NET!!) from W2k3 to W2K12 R2 (also from SQL server 2K -> 2K12). The ASP program file has a config for SQL server connection string which ...
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2answers
5k views

SQL Server running under a domain account cannot register its SPN

I am trying to configure a fresh install of SQL Server to run under a domain account. However, I get intermittent errors when trying to connect to the server using another domain account, and I still ...
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2answers
78 views

Windows Integrated Authentication with IIS Farm and subapplications

Assume the following site layout www.contoso.com - runs as CONTOSO\sitePool www.contoso.com/subSite1 - runs as CONTOSO\subPool1 www.contoso.com/subSite2 - runs as CONTOSO\subPool2 The pages should ...
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1answer
980 views

Can't get postgres and kerberos (gss) working together

I am trying to get postgres and kerberos, via GSSAPI, working together. Having trouble at this point. It does not help that I am really a newbie for both technologies. I have both postgres and ...
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2answers
1k views

Cannot access shares via \\servername but \\ip works

To set up the scenario: One of our techs set one of the domain controllers to use Microsoft time. The time IS correct (including Time Zone) and DOES match the other domain controller's time; it was ...
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0answers
29 views

Kerberos Errors

Need help with the below error. I haven't been able to find much that has helped. Event Source: Security-Kerberos Event ID: 4 Qualifiers: 16384 Version: 0 Level: 2 Task: 0 Opcode: 0 Keywords: ...
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2answers
60 views

Apache/mod_auth_gss authentication failure

Sorry if this is the wrong stackexchange site for this. Based upon the documentation (for reference I also used this blog post) I have this in httpd.conf: # Increase max size of HTTP request headers ...
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24 views

Reporting Services 2008 and kerberos delegation/impersonation

I've spent quite some time configuring the use of Kerberos and Windows 2008 SQL Reporting Services - I've registered all the SPNs, configured the various authentication options in the XML files and ...
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2answers
107 views

Possible to authenticate Samba via Kerberos but without domain-join?

With a Kerberos config file... [realms] DOMAIN.COM = { kdc = dc1.domain.com admin_server = dc1.domain.com } ...it is possible for Linux to talk to Active Directory for password ...
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0answers
97 views

IIS 8.5 / Windows Authentication - 401 response on certain clients

We are running a Tomcat application behind a IIS 8.5 Windows Authentication Proxy, the redirect is via the tomcat AJP connector. We now have the problem that on certain clients, the authentication ...
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0answers
16 views

Kerberized root user on RHEL 5/6

I'm currently involved with getting NFSv4 and Kerberos. We've decided to bite the bullet and try and make the transition. Our environment is: Windows AD LDAP auth on Linux against said AD. ...
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4answers
12k views

kinit & pam_sss: Cannot find KDC for requested realm while getting initial credentials

I have a very similar problem as described in this thread on CentOS 6.3 authenticating against a 2008R2 AD DC. Here is my krb5.conf, I know for a fact that XXXXXXX.LOCAL is the true domain name: ...
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7answers
32k views
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kinit won't connect to samba4 domain controller, cannot resolve hostname

i have set up a domain controller on my virtual machine. At first i will post all important configs, so you know what works already. Hostname: affenhirn2 Domain Name: example.affenhirn2.local (i am ...
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12 views

Setting environment variables based on passing Require directive

I finally succeed on configuring Apache as a SPNEGO reverse proxy for my app, and I'm using the AUTHORIZE_SAMACCOUNTNAME, AUTHORIZE_CN and AUTHORIZE_MAIL to figure out some information about the ...
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2answers
2k views

How do I re-enable Kerberos authentication after upgrading to Mac OS X 10.10 Yosemite?

In previous versions of Mac OS X, one could enable Kerberos authentication when a user logs in by following a support document. Specifically, this document explains that the file ...
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2answers
2k views

Change local password as root after configuring for MS-AD Kerberos+LDAP

I have followed this excelent post to configure Kerberos + LDAP: http://koo.fi/blog/2013/01/06/ubuntu-12-04-active-directory-authentication/ However, there are some local users used for services. When ...
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1answer
3k views

SSO with Apache and Kerberos issues

I am trying to set up SSO on my Apache web server using Kerberos so that users logged into the local domain are recognised and logged in immediately. I have followed this guide to the letter but I ...
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0answers
37 views

Why does Hyper V differs in authentication methods for live-migration and replication

Hyper-V provides different authentication methods for replication and live migration (2012 R2 based). Live Migration is using CredSSP and Kerberos and replication Kerberos or PKI-based authentication. ...
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0answers
10 views

Kerberized NFSv4 share (deleted) after token expiry

I set up a NFSv4 server with Kerberos authentication and it runs well. However, some users stay logged in for long times such that they have to renew their tickets after some days. If during the time ...