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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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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6 views

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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13 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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20 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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22 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
70 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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2answers
63 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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2answers
57 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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56 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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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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39 views

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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33 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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9 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 ...
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31 views

How can one determine what Kerberos key encryption algorithms are supported on a Cisco IOS device?

When attempting to load an SRVTAB over TFTP, I receive an "Unsupported keytype" error: abc(config)#kerberos srvtab remote 1.2.3.4 abc.srvtab Loading abc.srvtab from 1.2.3.4 (via Vlan123): ! [OK - 121 ...
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1answer
65 views

How can one enable DES-encrypted keys on an Apple KDC?

We are running a KDC on OS X 10.10 Yosemite, to which we have added a service principal for remotely accessing a (legacy) host: $ kadmin add -r host/a.b.c.d@REALM Since the host only supports ...
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1answer
51 views

Why does a SPN on a different host cause a server to lose its trust? How should I fix it?

I have a brand new server image that loses its trust as soon as it's joined to the domain. I suspect it's because of the duplicate SPN I discovered using the LDAP version of this Powershell script ...
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22 views

Kerberos Authenticator Encryption Type NULL

So, I've been working on a SSO enabled XMPP application on our network for a couple weeks. I have 95% of the bugs worked out, and everything is running smoothly. The problem is that I have a couple ...
2
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1answer
18 views

What is “Ticket Options” Referring to in Domain Controller Event Logs?

I'm trying to figure out what Ticket Options is referring too within this event log off my domain controller. It is in response to a kerberos authentication request. AgentDevice=WindowsLog ...
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0answers
29 views

CUPS remote print queues

In my network, there are multiple printers over many locations, all connected to a single CUPS server via whatever protocols they require. Client machines on the network need to print to the printers ...
5
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3answers
238 views

In a Windows PKI, what is a Workstation Authentication CA Template used for? What happens if it expires?

Many workstations have an expiring computer certificate that was issued using the Workstation Authentication CA template. The CA of this template expires in 2 days. I've deployed a new CA, with an ...
2
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1answer
83 views

IIS 7.5 web application failing with NT Authority\Anonymous Logon

I am finding various google results, but none seem to fix my problem. I am setting up a new WINDOWS 2008 R2 box at work that is to communicate with an existing SQL 2012 box via web tools running in ...
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1answer
228 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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21 views

Active Directory - Windows Kerberos integration

I integrated ActiveDirectory in Windows Server with Kerberos in Ubuntu machine I am able to generate tickets for the ActiveDirectory users in Ubuntu's Kerberos using 'kinit' command. Now would like to ...
2
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2answers
177 views

Putty Kerberos/GSSAPI authentication

I configured a few Linux servers to authenticate with Active Directory Kerberos using sssd on RHEL6. I also enabled GSSAPI authentication in hopes of passwordless logins. But I can't seem to get ...
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1answer
75 views

Kerberos Event 4 servername showing username

We have a .Net Windows Service that uses a Httplistener and authenticates requests using Kerberos. When users are connecting via their browser, an error in the users event log shows a Kerberos Event ...
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1answer
71 views

Kerberos SSH Man-in-the-Middle for Data Sniffing

Kerberos clearly keeps an attacker from getting a user's credentials in an SSH man-in-the-middle scenario (one where the attacker has gotten the user to trust their server's public key and redirects ...
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25 views

password ipa idm redhat change itself

I am new in Kerberos and I don't know why the password change itself I create another account but the problem persists after generating keytabe in IPA client the password of admin IPA idm redhat ...
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1answer
45 views

Does Active Directory alone is not enough to secure hadoop?

I am trying to secure Hadoop environment installed in windows. So basically I started to analyse how to secure a Unix-based hadoop cluster. Have gone through various links related to Kerberos and ...
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0answers
46 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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49 views

Setting up SPN for SSRS in a CRM load balance environment

I'm getting this exception randomly in a CRM load balance LIVE environment when running Reports from CRM. System.ServiceModel.Security.SecurityNegotiationException: A call to SSPI failed, see inner ...
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27 views

iis 7.5 application in webfarm using kerberos authentication not working for external users

I have setup my application to run using kerberos authentication,,it works fine at our end but when the application user tries to access he gets a 500 internal error..failed request tracing shows the ...
2
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0answers
52 views

Samba Shares Without Using Winbind

I am curious if it is possible to use samba shares without using winbind. In our current environment we are using SSSD, Kerberos, and Samba to complete the required tasks such as joining the windows ...
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53 views

How to support Kerberos authentication on internal websites through Citrix Access Gateway

When I remote in through a citrix access gateway (using netscaler) I am unable to use kerberos tickets for authentication with apache. The browser only sends an NTLMSSP negotiate header and gives up. ...
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1answer
46 views

Can I use user-based kerberos authenication with NFSv4?

Is it possible to set NFSv4 + Kerberos to do user-based authentication? As far as I understand you are required to create a principal for a client machine(i.e. it is still Host-based?) on Kerberos ...
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27 views

pwauth kerberos authentication specifying default and secondary servers

I am currently using Kerberos authentication for Basic Authentication on Apache using pwauth and mod_auth_external. I would like to add multiple servers to authenticate from, however they would have ...
1
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1answer
827 views

Apache kerberos authentication to Active Directory not happening. (Is KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN related?)

My goal is to have Apache authenticate authenticate against AD, without prompting for a username and password, using Kerberos. It currently always shows "401 Unauthorized", and appears to be not ...
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0answers
66 views

GSSAPITrustDns option missing from OpenSSH-6.7

I need to use the GSSAPITrustDns option to connect to a round robin service using Kerberos authentication. This works correctly using OpenSSH 5.3 and 6.6.1p1 on a selection of machines. I have an Arch ...
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24 views

How can I utilise resource based delegation

Windows 2012 comes with an extension to the existing Kerberos Constrained Delegation, called resource based delegation (RBCD). There are a number of great articles that explain how it works for ...
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1answer
153 views

libnss-ldap getent passwd - AD replies correctly but output shows local /etc/passwd

I am trying to configure libnss-ldap to provide AD authentication to my Linux Debian servers. This is working fine if user exists locally, I want to make it work for Domain users. Here is my ...
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0answers
34 views

Apache auth_kerb_module on Windows

I need to install the Kerberos module in Apache on Windows. I have copied the file auth_kerb_mod.so to apache/modules/ and I have modified the conf/httpd.conf with LoadModule auth_kerb_module ...
2
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2answers
1k 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 ...
4
votes
2answers
114 views

Joining a NetApp to a domain on a Read Only Domain Controller

I have an isolated network, into which I've built a vfiler. The point of this network is that it's a non routed 'test' network. However, there's a need for LDAP/Kerberos and CIFS access to the ...
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0answers
32 views

Do kerberos constrained delegation with protocol transition on IIS to another IIS need my own application for very simple redirect

Please excuse me if its a very basic question but i'm totally lost on this as Im new to IIS and kerberos delegation but have understanding of auth protocols. Need you peoples help please as i have ...
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0answers
128 views

Postfix + Saslauthd + Kerberos 5 + CentOS 7 not working

I've almost got saslauthd checking against Kerberos but seeing some last issues on CentOS 7. When postfix talks to saslauthd, it sends a lowercased domain and it's not corrected. I tried to fix things ...
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28 views

Windows Interoperable Kerberos V5 Realm tcp KDC

I have a Windows 7 client that cannot reach a mit-krb5 KDC due to a firewall beyond my control. More specifically the client can reach the KDC, but the KDC's udp response does not make it back to the ...
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0answers
38 views

SSH from Windows to Linux with certificates generated by a central PKI stored in AD

I would like to have a central PKI where certificates are issued for all sorts of services and devices as well as users. I would like to push these certificates to one or more active directories. (so ...
2
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1answer
150 views

Kerberos-PAM authentication failure: pam or pre-authentication

kinit -p 'username' works -- no problem with the setup of the Kerberos realm. I can't get the login from the GUI to work, however. Client auth.log: pam_krb5(gdm3:auth): user <username> ...
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0answers
71 views

Apache+subversion Kerberos Authorization Active Directory

I have configured Apache+Subversion with Kerberos. Here's my config: SSLRequireSSL DAV svn SVNPATH /var/www/svn/testrepo AuthType Kerberos Krb5KeyTab /etc/krb5.keytab KrbAuthRelams ...
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1answer
70 views

Lightweight webserver with SSPI authentification [closed]

I'm looking for a fast, lightweight web server (for example nginx or lighttpd) which supports authentication to a Microsoft Kerberos authentication server (SSPI). This webserver must run under Windows ...