Questions tagged [kerberos]

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.

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13 views

How do you uninstall kerberos from Bash? or Change server name?

I setup the wrong server name and admin name. I sthere a way to change it? instead of uninstalling it? Thanks
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Kerberos for machines with multiple domain names

I have several *nix routers that have multiple IP addresses. They are running WireGuard and BGP to announce two address ranges under two different ASNs. For example: a machine called pis1.us.nodes.<...
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mount.cifs: Any way to mount with kerberos using the machine credentials

When a Linux machine joins a domain, a computer account is created in Active Directory. Can this account be used to mount a network share with cifs and Kerberos?
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sssd only authenticates against first domain in domains list unless domain specified in login

I am currently moving from using pam_krb5 to pam_sss as pam_krb5 is no longer available at CentOS/RHEL 8 We currently use two AD domains each with unique user names. In the old pam configuration we ...
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Could not find or load main class sun.security.krb5.internal.tools.Klist

I'm getting the following error when trying to verify a keytab file using Java (OpenJDK 8) on CentOS 7.9. Are krb5 tools not bundled in OpenJDK or am I doing something else wrong? # java sun.security....
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Impacket not producing Kerberos ticket hash

I have a question that you may all be able to help me with. I am setting up a kerberoasting honeypot on my Windows domain. I have it set up and I was using Impacket to run a test on it from Kali. Here ...
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How to use HiPAM authorization with OpenSSH?

My client is implementing HiPAM (or Hitachi ID) for production systems. One requests temporary access to machines in a certain group, and can, upon approval, access them either via an ssh-client ...
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23 views

execute program as computer account

Given a joined Windows 8 or 10 system, how does one run some script with the credentials of the computer account? Without installing any third party tools, just a vanilla Windows install. The purpose ...
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37 views

Kerberos gets tickets for wrong user

At work, I have two active directory/domain accounts: username - I log in to my computer with this adm_username - this user is administrator for some servers that I am responsible for We have a ...
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Kerberos SSO not working with some hosts

I'm trying to setup Kerberos SSO for a domain with FreeIPA. Having seemingly configured everything properly I noticed, that it is working for some hosts, and for some it is not, for unknown reasons. ...
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308 views

AD: No TGT after logon

I’m investigating a domain where logon does not seem to produce a TGT. After logon with a test account, klist tgt outputs this: Current LogonId is 0:0x71647be1 Error calling API ...
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Join a Linux (ubuntu 18.04) Instance to AWS Directory Service (Directory type: Microsoft AD)

I followed the document https://docs.aws.amazon.com/directoryservice/latest/admin-guide/join_linux_instance.html Everything was working fine, but suddenly started to fails. I decided clean all and ...
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188 views

How to figure out my Kerberos principal on Windows?

On a Unix system with Kerberos configured, I'd use klist... How does one query his Kerberos principal(s) on Windows? (Using the Active Directory, not MIT implementation.)
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How to prevent BYO devices connecting to AD domain

My client has a computer lab several with Windows 10 PCs connected via ethernet to the company's active directory domain. each individual at the company has their own credentials with which to login. ...
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209 views

notepad.exe connects to tcp/389

I have recently began noticing several computers in my corporate network exhibiting some unexpected behavior when opening .txt and .rtf documents from a UNC path hosted on my DC using notepad.exe. In ...
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Kerberos: Cannot contact any KDC for realm while initializing kadmin interface

This is making me pull my hair out. I run a fileserver on my home network. I've been using SSHFS, but it's just unacceptably unstable. Dropped connections, horrible performance, ungraceful automount ...
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231 views

Get kerberos ticket as file

I am trying to get a kerberos ticket as a file. The kerberos server is FreeIPA. When I login using kinit USERNAME on the computer, It logs in just fine. When I view the ticket using klist, it shows ...
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RDP logon failure with time based group membership

The scenario includes 2 user accounts, one is the ordinary user account used for logging in and checking email/skype etc, the other one is an administrative account used for managing infrastructre (...
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1answer
248 views

Why samba don't ask user and password when user and password are same on both side?

I create a samba share like this [test] path = /data/test valid users = test read only = no writable=yes browsable=yes then add user test and password test, if the computer use the same user and ...
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Opera web browser kerberos authentication with delegation support

I'm using a LAN web site which relies on impersonation to be able to connect to a SQL Server machine (located on another machine in the domain). I'm not able to get it to authenticate properly using ...
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6k views

Couldn't join realm: Insufficient permissions to join the domain

I'm getting the following error when I try to join the linux machine to AD: $ realm join proxmox.local --computer-ou="CN=TEST,CN=Computers,DC=proxmox" --verbose * Resolving: _ldap._tcp.proxmox.local ...
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Active directory authentication and LDAP

i am studying Active Directory directory services (AD) and all connected things (LDAP, kerberos, ...). I don't fully understand, how LDAP objects and AD interact between each other. So can you comment ...
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Client or server has a null key while getting initial credentials when trying to authenticate to ApacheDS Kerberos

I am running an instance of ApacheDS, and use it for Kerberos authentication. According to the documentation, the server should automatically generate krb5Key attributes on each LDAP entry for a user ...
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Linux Active Directory login failed because of password

I have a Linux machine that has a connection to the AD. kinit command works correct (it has no output when I run it). But when I try to login to this Linux, I get "Access denied" error. Dec 20 16:33:...
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What happens if you enter the incorrect password too often for ktpass command

I need help with the Kerberos ktpass functionality in regards to incorrectly entering the password multiple times: What happens if we automate the ktpass command to run in a Linux bash shell "for" ...
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426 views

Unable to authenticate with AD after IP change

I have a linux environment with a single AD server. It looks like the previous sys admin setup ldap with kerberos and sssd. Recently we went through an IP change, changing the IP on the AD and all the ...
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1answer
619 views

SSH user not getting authenticated through kerberos

I have setup kerberos in my ubuntu machine and I am able to get tickets for users via kinit from my other Fedora Linux client machine. But getting below error in sshd debug logs, no idea what it ...
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755 views

Ansible using Kerberos fails on Windows host if Basic authentication is not enabled

I'm trying to configure a Windows Server 2019 host with Ansible, using Kerberos as the transport protocol for WinRM. I had initially run the ConfigureRemotingForAnsible.ps1 script on this host while ...
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1answer
158 views

InitializeSecurityContext failed with SEC_E_DOWNGRADE_DETECTED

I have a question. There's a client and server apps. Client connects to server using kerberos authentication, the client need to retrieve a token from the server - it invokes InitializeSecurityContext ...
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1answer
36 views

Kerberos v5: SPN as a client in AS_REQ

Is it possible to use service principal name, e.g. HTTP/something.com@REALM.COM (not user principal name) as a client in AS_REQ to MS Active Directory to get TGT? What principal type should be in ...
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1answer
1k views

Apache reverse proxy not passing custom headers to the target server

I have configured Apache as reverse proxy to my PostGraphile service. My idea is to use Apache to do kerberos authentication and then make PostGraphile service available to authenticated users. I ...
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1answer
246 views

How to enable trust between two KDC's with same kerberos realm and same domain names?

I have two linux clusters in different DC's with same domain name and same realm but the KDC's are different. How can i enable trust between these two KDC's ??
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SAMB permissions cant add groups though windows

I'm pretty new to Samba and I've been having troubles allowing domain users to access shares. I've linked my samba server (centos 7) as a domain member to my AD.command # realm list shows the proper ...
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356 views

zeppelin Caused by GSSException: No valid credentials provided (Mechanism level: Failed to find any Kerberos tgt)

When I use zeppelin0.8.1 to connect hive with kerberos, it doesn't work, the following problem occurs. ERROR [2019-07-25 03:46:19,513] ({pool-2-thread-2} JDBCInterpreter.java[open]:197) - zeppelin ...
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1answer
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kerberos error while creating database

kerberos error while creating database Loading random data Initializing database '/var/lib/krb5kadc/principal' for realm 'HADOOP.COM', master key name 'K/M@HADOOP.COM' You will be prompted for the ...
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296 views

how should I remove krb5libs in kerberos?

I am not able to remove krb5libs I have the following error while removing krb5lib. yum remove krb5-libs Error: Trying to remove "systemd", which is protected Error: Trying to remove "yum", which ...
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VMWare vm jumps to different times when it is idle for a while and causes Kerberos authentication to fail

I have an issue and trying to get to the root cause of it. Setup: I have a cluster of virtual machines, one of them being a Kerberos KDC and another one being a Java-based webserver that ...
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665 views

Cannot contact any KDC for realm 'MYDOMAIN.COM' while getting initial credentials

I'm using AzureDevOps and have project with DockerCompose file. While building it locally within working network it looks good. But when I run build (Docker Compose task with Build services action) in ...
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3k views

Cannot authenticate with Kerberos with PuTTY, but can with WinSCP

I've been using PuTTY with Kerberos authentication to connect to a server for work, but accidentally overwrote my settings with a blank template (not sure why the Save and Load buttons are right next ...
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1answer
682 views

Windows 10 extremly slow when logged into Kerberos account

Since Windows 10 we have a problem with Windows-based clients in our FreeIPA linux domain. We use ksetup to allow authentication over Kerberos so that, after setting up local accounts, users can use ...
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3k views

Kafkatool.exe failed create new KafkaAdminClient SASL_PLAINTEXT

I have created a kerberized Kafka cluster. It is working fine and I can produce and consume messages. Now I want to use the kafkatool2 software, and I am running the program through cmd by this ...
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7k views

pam_sss(sshd:account): Access denied for user AD

sssd.conf: [sssd] domains = corp.com config_file_version = 2 services = nss, pam [domain/corp.com] ad_domain = corp.lecapam.com krb5_realm = CORP.COM realmd_tags = manages-system joined-with-samba ...
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3answers
633 views

Unable to set up Outlook with local IMAP (dovecot) host on Mac

I am trying to configure Outlook 365 (version 16.22.1) on Mac High Sierra (10.13.6). The Mac is a domain member on a Windows Active Directory domain. Our office has a self-hosted IMAP mail server ...
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2answers
4k views

How to install Kerberos client on Windows

I had installed KDC server on RHEL and also installed the Kerberos client on Ubuntu. Able to perform the ssh login from client to server through Kerberos.(without password). Now, I want to use same ...
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319 views

empty realm part not allowed Issue with Kerberos Authentication over DB2 Server

I am trying to connect to Db2 server over a Kerberos Environment. I am using DB2SimpleDataSource in my code to get a connection to my DB2 server. As per my current understanding, if I have a kerberos ...
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Kerberos settings for Windows environment

We do have below Windows env with Kerberos enabled- Machine A - KDC, Machine B - Sftp windows service Machine C - Client from where are trying to connect through ssh command. When we are trying to ...
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1answer
2k views

Unable to authenticate on Samba AD DC server

I have a Raspberry Pi 3B+ that I use as a home server. I have installed and setup Samba AD DC from the Raspbian pacakges (4.5.12+dfsg-2+deb9u4). I have configured SSSD on the AD DC server to ...
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408 views

Enroll MacOS 10.13 in FreeIPA domain?

I tried following this guide to enroll a mac on OS X 10.13.6 in my FreeIPA domain that all the linux machines on my home network are. All the steps worked, but I can't log in with any freeipa users ...
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80 views

Keytabs generation issue

I have troubles while creating keytabs for user. Keytabs are working only when I have rc4-hmac encryption enabled [root@host ~]# klist -kte test_user.keytab_rc4 Keytab name: FILE:test_user....
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963 views

ssh ProxyJump with Kerberos

There are two fine intermediary hosts between my workstation and where I need to end-up. I was attempting to use the ProxyJump configuration to make this connection, but it does not appear to work. ...