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Questions tagged [authentication]

Questions about authenticating wireless connections, SSH keys, or passwords in Ubuntu.

0
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1answer
31 views

PAM: Authentication failure

Pardon for dumb question, just getting started with Linux, and I think this multiple questions all rolled into one. I have setup a AWS Ubuntu machine. I am getting to that machine from Windows by ...
0
votes
1answer
24 views

switch from SSH key-based authentication to normal account login

The current login method of the server is SSH key-based authentication, I wish to switch it to normal linux login by key in username and password. i understand this is unnecessary, but i have to ...
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2answers
45 views

Why is /var/log/auth.log.1 smaller than auth.log

I know there's a cronjob that rotates the auth.log files every set amount of time but I have noticed that the auth.log.1 is small compared to the actual auth.log. Doesn't auth.log get renamed to auth....
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0answers
26 views

Login fails silently on system restart, after adding new module to /etc/pam.d/common-auth

I am attempting to add an auth-only PAM module (poldi, to support login via GPG SmartCards). The way I have it configured works perfectly well for most authentication use-cases: sudo unlocking a ...
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0answers
21 views

What last line in output `auth.log.1 begins Sat Feb 14 13:13:28 1987` depicts after typing below command on terminal in ubuntu 14.04

After type below command on terminal... last -f /var/log/auth.log.1 I got ring-dae :58 codecody omponent was alr Sat Jul 15 12:06 gone - no logout .service sionManager codecody97-HP-No Thu ...
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0answers
12 views

Stunnel mutual authentication

i have an Ubuntu 18.04 VPS with stunnel service running on,i want to connect to stunnel from windows and android but with certificate verification. everything works fine if i use default config on ...
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0answers
19 views

Bypass Squid Auth internally

I would love to go set up a squid server for home use. I searched around on the web, where I found that Squid auth can be bypassed for users. I want to use the proxy externally for myself with ...
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0answers
42 views

Ubuntu 18.04 VM; unable to initialize PAM: No such file or directory

I'm trying to learn more about Unix systems, and am working on hardening an Ubuntu Server VM (using VMWare Workstation). In the process of which, I must have done something that messed with the pam ...
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0answers
25 views

SSH doesnt update btmp or auth.log when user exists on system

Im not sure if ive encountered a bug or not.... Ive gone ahead and enabled the pam_lastlog.so showfailed in PAM and I can see its running properly when I authenticate to the system. My Issue is its ...
1
vote
0answers
14 views

Ubuntu client cannot connect to ubuntu server since update but windows client can

I'm the administrator of 3 small ubuntu servers used in our scientific group and I have ubuntu 18.04 on my personal laptop. For the past two weeks I've been unable to access the servers remotely (I'm ...
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0answers
21 views

When I try to use Login Window in Cinnamon's System Setting, it keeps showing a authentication popup and never let me get in

I recently installed Cinnamon on my Ubuntu 18.04. And, it seems running right. Today, I tried to change a background pic for its login session. I researched online, and I installed lightdm-settings by ...
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0answers
35 views

Multiple Subdomains with different ssh host keys (docker containers)

I am trying to get rid of these annoying message Warning: the ECDSA host key for 'mysub.domain.de' differs from the key for the IP address 'XXX.XXX.XXX.XX' Offending key for IP in /home/thisuser/.ssh/...
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2answers
3k views

The repository 'http://dl.google.com/linux/chrome/deb stable Release' does not have a Release file

After executing this command sudo apt-get update && sudo apt-get -y upgrade I get this error W: The repository 'http://dl.google.com/linux/chrome/deb stable Release' does not have a Release ...
0
votes
1answer
31 views

SSH Login Via Keyfile With No Local Password

I have my remote SSH setup with my public key so I can login with it. This is great; however, I still have to type the password for my private key file. How can I login using the keyfile and no ...
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0answers
24 views

Proxy server with authentication

I want to create a proxy server that will check if user is authenticated (e.g. in database) and if not send him to custom captive portal when he can log in. And if user is authenticated just pass him ...
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0answers
63 views

Weird behaviour about password prompts and permissions in Lubuntu 18.04

I am having a strange behaviour with Lubuntu 18.04 fully updated machine. I try to use software application (system tools -> software) to install some application. Say for example Raincat. When I ...
2
votes
1answer
384 views

why wget does not use userName and password in URL first time

Below is the command and response of wget, It first time does not use provided userName and password and get 401, later it uses the auth and gets 200. This works well with curl but same thing happens ...
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0answers
52 views

Join ubuntu 16.04 machine to windows active directory domain using PBIS

I was using PBIS to join ubuntu machine to windows domain. Before running the domainjoin-cli command to join to windows domain, I have to specify the domainname, ip address of windows domain in the "...
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0answers
85 views

Ubuntu 18.04: Authentication is required - no drop down menu in order to select admin user

We are two admins in the network, and on each computer that we install Ubuntu we have set our own user. Each PC has the following users: admin1,admin2,desktop_user. When I try to install something ...
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0answers
199 views

pam config issue ( bad jump )

After some packages/data got corrupted, I ran fsck and repaired the packages from the recovery console. As far as I can tell all packages should be whole and apt does not complain. However - I cannot ...
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0answers
49 views

Migrating servers

For my sins I am assisting a friend in migrating from a 10 year old SuSE mail server to one running Ubuntu-18.04. One of the things I need to do is migrate over about a dozen or so users--several of ...
4
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1answer
310 views

A lot of PAM authentication errors on my logs targeting my mailserver. How do I stop it?

I need help pinpointing some errors in my auth.log file on my Ubuntu server. A few weeks ago, I found a plethora of login attempts to my SSH port (22) on auth.log, so I changed my SSH port. It was ...
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0answers
295 views

Integrate Ubuntu 18.04 box with one AD domain and user with other AD domain

I will try to explain my problem as simple as I can. I have the following problem: Our organization has two Active Directory forests, in one hand computer.forest.com has the computer objects, in the ...
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0answers
111 views

Upgrade from 12.04 to 14.04 via proxy server

We're attempting to upgrade our Ubuntu 12.04 system to 14.04. Our internet connection for the Linux server goes via a proxy server that requires authentication. From a putty session I've been able ...
1
vote
1answer
862 views

Fingerprint-GUI login ISSUE with new 18.04 LTS

This exact same question was asked here but the community missread and marked inacurately as a duplicate. fingerprint-gui and 18.04 login issue I am also NOT asking HOW TO install. I am asking ...
0
votes
1answer
386 views

Not able to connect to GitHub via proxy

Not sure if this question belongs in this forum but I'll give it a chance. I'm trying to connect my Ubuntu with GitHub via a proxy so I can clone repositories via the git command. I've followed the ...
1
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0answers
49 views

Wifi working on band 5 but not 2.4

I have recently installed Ubuntu for the first time ever on an old laptop and it went mostly well. A couple of days ago I dug out another old laptop and installed Ubuntu 16 LTS desktop (32 bit this ...
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0answers
42 views

ssh'ing from one computer to another on same subnet with rsa authentication

I have two computers on the same subnet and am trying to ssh from one to the other. I have no problem logging in back and forth with passwords, but I want to use rsa or dsa authentication. I have ...
2
votes
2answers
666 views

Ubuntu 18.04 LTS Samba vs Windows 10 Pro

I'm trying to access Samba share using IP address in URL (\\IP_address)from two Windows 10 clients. One physical and one virtual. The physical is on same subnet as Ubuntu server, virtual is Hyper-V ...
2
votes
1answer
54 views

How to only make one user authenticate via SSH keys and allow password authentication to all others

I was wondering if it would be possible to only force SSH key based authentication to one user (admin) and allow all other users on the system (excluding root, who's ssh login is already disabled in ...
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0answers
36 views

Ubuntu 14.04 login screen disappeared

I had problem logging in and I clicked on a icon and "Debian windows" (It has a Debian logo swirl on a gray background). This new format took over and now I can't get back to the regular Ubuntu format ...
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0answers
34 views

ubuntu slow on ssh/sftp connecton

I recently purchased vps server with ubuntu. when i test it worked file. but now i found a problem.. after i worked about 1hours it gets slows down while connecting/authentication to server. ...
1
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1answer
1k views

fingerprint-gui and 18.04 login issue [duplicate]

I installed fingerprint gui in my laptop having Ubuntu 18.04. But I am not able to login using fingerprint while in terminal using sudo commands it is working fine but for login it is not working.
0
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1answer
271 views

Git asking for private key?

I'm on Ubuntu and I'm learning how to use Git collaboratively. I have created a pair of public/private keys on my local Ubuntu desktop with the following command: ssh-keygen -b 2048 I then accessed ...
1
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0answers
66 views

Track all process activity in real or near real time on Linux

I want to track the activity of processes. For processes, forks, file access, etc. should be tracked. Also files, data transfers, authentication events, authorization events, and similar. It should ...
0
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1answer
565 views

su: Authentication Failure, stopped working

I recently installed Ubuntu 18.04. I used su command, entered my accounts password. It worked successfully for few times. Then I got Authentication Failure, now I'm not sure if I entered wrong ...
1
vote
1answer
308 views

Where is my private key?

I was following this tutorial to generate and assign a key to one of my servers, but before running ssh-copy-id -i ~/.ssh/mykey user@host I was tring to find my private key and guess what I can't find ...
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0answers
55 views

How do I avoid shutdown-inhibition caused by an interrupted, then completed, Ubuntu upgrade?

When I try to suspend/reboot my Ubuntu 18.04, I get a dialog asking for a password: "Authentication is required for suspending [respectively: rebooting] the system while an application asked to ...
2
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0answers
428 views

Ubuntu 18.04 (Gnome) authentication error when logging after lock/suspend

I have an issue with screen unlocking. It just rejects my password. And I noticed, it depends on time how long it was locked/suspended! If I unlock 10-20 min. after locking it accepts password and ...
2
votes
1answer
69 views

Why is 'Authenticated' setup of FTP on ubuntu very insecure?

I am reading the documentation for setting up an FTP server on Ubuntu, and the documentation states that using Authenticated users is very insecure. I dont understand why, because I am under the ...
0
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0answers
38 views

setting up pam stack with pam_google_authenticator - the most secure way

I've just tried to setup multi factor authentication for sshd, login, su, sudo, policykit, screensaver and lightdm. It works as expected and 2 factors are required to authenticate. ( plus public key ...
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0answers
78 views

Using Corporate Windows Authenticaion

We use a corporate Kerberos\LDAP authentication server that I would like to access in order to use that for authentication on a new Ubuntu 18.04 server. I know there is a way but I don't seem to be ...
0
votes
1answer
48 views

ssh authentication server does not work

i recently wanted to use ssh-keys instead of passwords for my server (Debian stretch). I am using an ubuntu subsystem on Windows (in case it matters). I was following the top answer from this thread: ...
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0answers
127 views

Can't login, “Authentication Error” after trying to login after system locks, fresh Ubuntu 18.04

After my desktop locks for the first time after my original login, I cannot unlock it again, it says "Authentication Error" even though I am positive I have typed my password correctly. It happens ...
2
votes
0answers
380 views

18.04 cached LDAP passwords

Over the last week I have been working on getting the (Ubuntu 18.04) LDAP directory information cached locally to allow the use of roaming users(on Laptops). Getting the LDAP client setup correctly ...
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0answers
266 views

Gnome-calender Authentication Request [duplicate]

In The Above ScreenShot there is some pop-up thats i will get when open some application. please kindly solve my problem how to close its permanently. I am Using 18.04 LTS How to trun its close ...
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0answers
24 views

Use CUPS with Chip Print Authentication

I have a Raspberry with CUPS installed. Before printing a print job, I want the user to authenticate via a chip directly on the Raspberry via the built-in chip reader before printing. I have not found ...
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0answers
39 views

Ubuntu Software Center will not allow installation of applications

I'm attempting to install PlayOnLinux, and every time I do, I get the error: Software can't be installed or removed because the authentication service is not available. (org.freedesktop.PolicyKit....
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0answers
640 views

How to install PAM for OpenVPN server?

I followed a guide on installing an OpenVPN server on Ubuntu successfully, and all is well with authenticating and connecting, etc. However, now I want to implement username/password authentication (...
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0answers
80 views

No Kerberos Auth wizard after installing krb5-user

I'm using Ubuntu 16.04 and am attempting to setup Kerberos authentication. Throughout the net every guide I came across shows this Wizard showing up right after installing this package. However, in my ...