Ubuntu :: Authentication Password Rejected On VNC'd Desktop / What To Do?
Feb 8, 2011
I've been using the Ubuntu desktop for a couple of years now, but I don't have much experience using the terminal.
I've just set up a home server using Ubuntu-server 64bit which will be headless and its main function will be a Mythtv backend.
I've worked out how to use VNC to send a desktop from the server to my laptop, but when I try to use any programs which require root privileges such as synaptic or the user/groups manager, the pop-up asking for authentication refuses to accept my password.
Is there a setting I need to change on the server which prevents remote users from getting root privileges on the desktop?
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Feb 18, 2011
I have 2 laptops running Ubuntu 10.04. One connects to my Linksys wireless modem fine while the other does not. The one that does not connect, will connect fine within the instances of Windows XP SP3 and Puppy Linux 5.1 that run on the same laptop. Ubuntu wireless worked fine with version 8.04 on this laptop before upgrading to 10.04.
When trying to connect within 10.04, Ubuntu pops up the dialog box to enter the authentication key. It rejects the correct key, and after a moment, pops up the same dialog box asking for the key again. I'm using WEP 40/128-bit encryption and the key I enter in the dialog box is the correct 26-character key.
The laptop is a Toshiba Satellite Pro 6000 (1g ram/40g disk). Here are some vital outputs root@user-laptop:/home/bsmis# iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
irda0 no wireless extensions.
eth1 IEEE 802.11b ESSID:"kr_wireless"
Mode:Managed Frequency:2.457 GHz Access Point: None
Bit Rate:11 Mb/s Sensitivity:1/0
[Code]...
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Jul 19, 2010
host - Debian 5.0 desktop
guest - Debian 5.04 desktop
KVM
On host running; $ ssh -XfC -c blowfish user@guest_IP xterm$ /usr/bin/X11/xauth: error in locking authority file /home/user/.Xauthority X11 connection rejected because of wrong authentication. xterm Xt error: Can't open display: localhost:10.0 (hanging here) /home/user/.Xauthority is an empty file, just created. $ sudo ls -l /home/user/.Xauthority-rw-rw-rw- 1 user user 1 2010-07-19 03:16 /home/user/.Xauthority
Nor lock exists. The password is correct. $ ssh user@guest_IP xterm I can connect the guest.
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Oct 19, 2010
I have two machines X , Y . X is running on runlevel 5 while Y is running in runlevel 3 , I am trying to connect from machine x to y using X11 forwarding using the following command.
ssh -X username@IP
But i have the following error message.
"X11 connection rejected because of wrong authentication"
Both servers are running RHEL 4.7
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Jun 21, 2015
I installed Jessie with Cinnamon alongside Win 7 - all went quite well though I did have to do a bit of guessing along the way.
Following online tutorials etc, I tried to install sudo from the terminal. It did not go well - some stuff appeared that was not shown in the instructions from many sites. So I abandoned it, or so I thought.
Then I discovered that my root password was no longer recognised. So I reset it, following online instructions.
This was successful apparently, as I can log in as root and see this in the terminal.
But on trying to start Synaptic ( and later others), I found that the new root password would is not authenticated, but my user password does authenticate successfully. This seems to be the wrong way round!
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Nov 17, 2010
I am running Ubuntu 10.04 LTS. I am trying to run a query browser for mysql but keep receiving the following error:
X11 connection rejected because of wrong authentication.
The application 'mysql-query-browser-bin' lost its connection to the display localhost:10.0; most likely the X server was shut down or you killed/destroyed the application.
In ssh_config, I do have ForwardX11 set to yes.
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Apr 7, 2010
On the several machines on my network, I am having difficulty using ssh
and sftp.
Machines are as follows:
1. a Slack machine 2.4.26 kernel
2. a Suse 10 machine 2.6.22.xxx kernel
3. a Ubuntu 9.10 machine 2.6.31.20.xxx kernel
I can use sftp/ssh between 1 and 2. in either direction - no problem.
I cannot sftp/ssh between 3 and anything. sshd is running on the ubuntu machine. I used to be able to sftp/ssh between 2 and 3 but only if 2 started the process.
The failure is machine #3 not accepting the password to or from the other machines, or at least that's how it presents.
All machines can ping each other.
The configs are defaults
I only dimly understand what's going on.
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Nov 13, 2010
I couldnt find any relevant threads so I created a new oneI am at my wits end sudden my encryption password is being rejected. It has worked before and it is written down I even tried loading a LiveCD hoping maybe an update screwed it up but even in the LiveCD the password isnt working.This wouldnt be such a big deal if I havent changed all my passwords and stored them in KeePass and havent got a chance to back it up yet
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Jan 10, 2010
I want to configure SSH key-based authentication and SSH password Authentication in same machine for different user .
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Sep 16, 2010
this problem is becoming too frequent now:
a) User is created using our standard protocol on the NIS/YP server.
b) *Sometimes* : user is rejected at first login. Password not recognized.
c) When going to do a password reset, being root on the NIS/YP server something like this happens:
# passwd johndoe
Changing password for user johndoe.
New UNIX password:
Retype new UNIX password:
NIS password could not be changed. << ------------- ERROR
passwd: all authentication tokens updated successfully.
The entry in the log doesn't help much: Sep 15 10:56:28 nisserver rpc. yppasswdd[2149]: update johndoe (uid=31742) from host 128. xxx194. xxx.xx rejected Sep 15 10:56:28 nisserver rpc. yppasswdd[2149]: Invalid password.
Notes:
1) A valid & strong password -known to work with other account- has been given.
2) The password is indeed changed in /etc/shadow, and the NIS/YP databases update (cd /var/yp; make) has not been done yet.
I know there is a different condition when the password is updated by the user from a Fedora host (long encoding using sha512 vs original md5 encoding in the server) - but this is happening locally on the CentOS-based server before having the user change the password. But even that has worked before with dozens of users.
A recent occurrence of the issue kept rejecting the original password chosen by the user until he decided to choose a different one. I have tried different from easy to elaborate passwords with no difference. This is just happening now with two new users: one of them reported that it worked just fine, the other is being rejected - they were created at the same time.
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Dec 20, 2009
I tried moving firestarter boot script around, calling firestarter in /etc/rc.local and in gnome-sessions (start programs) and so forth. Alas, only way to get it started is from root terminal with # firestarter --start-hidden & i use wicd, wlan0 and a router. Network monitor and iptables are installed.
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Oct 28, 2014
Suddenly Debian started rejecting my user pw and I have to login as root. Perhaps this is a coincidence, but this started when I re-booted after adding Russian keyboard layout in etc/default/keyboard. The Russian keyboard added successfully.
Being logged in as root, renewed the pw of my user account (actually assigned the same as wes previously), got confirmation the the pw has been changed. Reloaded. Yet it keeps complaining that the pw is wrong.
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Jul 26, 2015
I use Debian Jessie with Gnome.
I have installed Timeshift. Administrative password is requested when I click Timeshift icon in Gnome menu. I enter the password (or paste it to be sure) but it always returns with "incorrect password, please try agian" message. I am sure that I type my password correctly.
I looked at the icon's properties. It runs "timeshift-launcher". I changed it as "gksudo timeshift" or "sudo timeshift" or "gksu timeshift", enabled "Launch in terminal", disabled, but nothing changed. Always same password request window appears and it rejects my password.
However when I run "sudo timeshift" or "gksudo timeshift" command in Terminal it accepts my password and runs.
When I run for example Synaptics via Gnome Menu, password request window is with black background and it accepts my password. However when I run Timeshift, password request window is with gray background and it rejects.
Root password was not defined in my system during installation and I am the only user. I run administrative commands via sudo without any problem.
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Apr 28, 2010
I have a rather difficult problem. Every time I need root privileges and I am asked to authenticate (i.e. Update Manager, mounting a partition, etc), the password window comes up, shakes and immediately closes, leaving me with no chance to enter a password. What to do?edit: this is NOT the login window, just the little dialog that pops up when you need elevated privileges.
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Jul 25, 2011
I am running a small ubuntu-server headless machine at home. It is configured with sshd so that I can connect from anywhere (if I have Internet access.)However, there is a thing: I'd like to have good security and disable password authentication, but I also want to be able to connect from a PC that I've never touched before. And no, I'm not prepared to type a 256 bytes password every time I type "sudo ..."
Here is what I thought: I could have a login (pieroxy) that has a moderately strong password and another user (pieroxy-ext) that has a very strong password (100+ chars.) I would use my regular account (pieroxy) whenever I have a key-based authentication and the other one (pieroxy-ext) whenever I have a password-based authentication to do. Then, I'll just su to "pieroxy" and I'm done typing the 100 chars pwd. In order to do that, I would need to be able to configure my machine so that password-based authentication is disabled for all accounts but enabled for my account that has a strong password (pieroxy-ext). Is it possible to disable password-based authentication on a user basis?
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Oct 8, 2010
I had installed xp & ubuntu on my laptop hp compaq cq-40. Then i got this problem on su password authentication failure. I had alreadyformat and re installed ubuntu. But the su authentication still failure,
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May 3, 2011
I am running Ubuntu 11.04 which I like very much (except for Unity - so I am using Ubuntu Classic).
Whenever I try to use "su - " I get Password Authentication Failure. I have checked Caps Lock (obviously) and have also tried resetting the password using "passwd" - but with no success.
If I use "sudo ...." with a command the password is accepted.
I have the same software installed on two computers but the problem only occurs on one - the other is OK!
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Aug 16, 2010
I have a problem with ssh.I followed this guide:and no matter what I try, I still can't disable password authentication. I want users to require a private key to prevent from brute force hackers.
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Jan 7, 2011
I have a weird problem with ssh, I am trying to ssh to a solaris server (sparc) running solaris 10 from my Ubuntu box and as soon as it authenticates the password it closes the connection. The box is located on a internal network in a wiring closet with no ability for me to access console but i still have a working ssh session from 2 days ago with what i'm trying to comb through settings and trying to resolve the issue. It also has 2 NIC's and I cannot connect to the either ruling out hardware problem. I checked if there is a limit of the number of active connections and the was no limit. I was able to connect mitiple session till 2 days ago (at one point i had on my machine 8 active ssh sessions to the same server).
Here is the output of ssh -vvv:
Code: $ ssh -vvv -l user1 10.100.xxxxx
OpenSSH_5.5p1 Debian-4ubuntu4, OpenSSL 0.9.8o 01 Jun 2010
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0 .....
debug3: channel 0: close_fds r -1 w -1 e 6
Connection to 10.100.50.4 closed.
Transferred: sent 1768, received 1688 bytes, in 0.1 seconds
Bytes per second: sent 12077.9, received 11531.4
debug1: Exit status 254
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Mar 27, 2010
So after tinkering for a while, I was able to configure ssh for private/public key authentication and disabled Password-Authentication. In the past I had some issues with people brute force trying passwords/usernames so I want to avoid this, but I need some form of secure FTP that now doesn't work due to the aforementioned setting.
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Oct 13, 2010
I have a Ubuntu 10.10 installed on my HP Mini 210, and is having a problemth authentication dialogs when applications requests for elevated permissions. As far as I concern, there are two types of them, one is the kind when you run anything with gksu where the background dims and a dialog pops up. Another type is when you try toinstall software through Synaptic and a dialog box requests for your password. I am having problems with the later one.
Whenever the authentication dialog box pops up, after typing my password and presses enter, or the Authenticate button, the password field disappears while leaving the authentication dialog on the screen. The Authenticate and Cancel buttons are still clickable, but they are not bringing any actions by clicking them. I would have to let the application to continue with elevated permissions by manually closing the dialog. There are very very rareoccasions where the dialog disappears after I click on authenticate, which I can say is 1 in every 100 times
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Jan 26, 2011
Running Ubuntu 10.10 and I'm getting annoyed by the password authentication each time I want to do something. I find this more annoying than Windows 7 and UAC
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Apr 15, 2011
When I am upgrading, installing something or doing something that requires me to be Authenticated by using my password I just type it in and hit enter. However, each time I just click return after typing in the password it does not work. The window accepts my password but thats it and the window just sits there until it times out a few mins later. For this to work properly I have to type the password and then use the mouse to click the Authentication button. Why is this? Is there a way to solve this so I can just type in my password and click return like I do with everything else?
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May 9, 2011
Frustrated with ubuntu v11, i re-installed v10. At first my old authetication password worked. Then it stopped working and i can't make any changes because i don't know what word the blasted system wants. Am i locked out forever? Should i re-re-install v10 and everything else? or how i can change my authentication password without knowing what the computer wants?
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Feb 19, 2010
I have installed Ubuntu 8.04 inside windows and every time I go to the terminal and type "su" it asks me for a password. Well the password I set before the install doesn't work, it gives me an authentication failure. I thought that since it was inside windows it didn't set me as a root user. I go to user groups and I see my name there and then "root" above it, but its grayed out. Is there a default root password I can enter?
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Nov 25, 2010
It seems that every time I try to dowwnload any apps kept on asking me for authetication and a password and later denied me the download. Where is the password it kept asking and should get the authecation automatic (Why to)? I'm new at this so pardon for my ignorance. Looking forward to use your os.
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Feb 20, 2011
I am trying to set up remote login via SSH from my Mac to an Ubuntu desktop. Here is the error i am getting:
Code: Permission denied (publickey,password). I'll give background:
- Both computers are on the same network
- I'm not using the default port 22
- I have successfully logged in using password authentication, so it isn't a firewall/iptables issue i don't think. I've already worked through those issues!
- I haven't set up any tcp wrappers on the server yet, so nothing is being denied
- I believe the server sshd_config file is setup correctly. I can post it if needed.
Here's debugging info:
bash-3.2$ ssh localuser@xxx.xxx.x.x -v
OpenSSH_5.2p1, OpenSSL 0.9.7l 28 Sep 2006
debug1: Reading configuration data /etc/ssh_config
debug1: Connecting to xxx.xxx.x.x [xxx.xxx.x.x] port xx.
debug1: fd 3 clearing O_NONBLOCK
debug1: Connection established.
debug1: identity file /Users/localuser/.ssh/id_rsa type 1
[Code]....
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Feb 25, 2011
how do i stop autoboot of ubuntu? and when i try do " su " in the terminal and i enter my password it says failed authentication
but i logged out and logged in again with the password and it worked? is there a default password
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Oct 13, 2010
I set up a debian lenny in vmware on my windows machine. The network interface is set to bridged, so the virtual machine is connected directly to the university network i am connected to. I want to be able to ssh into the vm.I installed sshd via "apt-get install ssh", generated a key pair with puttygen and copied the public part to "/home/user/.ssh/authorized_keys", set rights to 600 and then tried to disable password authentication completely, following the "securing debian" documentation.this is how my /etc/ssh/sshd_config looks now:
# Package generated configuration file
# See the sshd(8) manpage for details
# What ports, IPs and protocols we listen for
[code]...
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Aug 8, 2011
I was hoping that someone could point me in the right direction. I just did an install and the os is up and running. During install, I set a root password and also set up a regular user account. The only option at login is the regular user acct. Needless to say, the os asks me to provide the root pw for just about everything I need to do.get an authentication failure. (I assume that this is the same as permission). I can find plenty of info on how to restrict access but nothing relevant to my problem. Just to rule out an install problem, I installed the os a 2nd time. I am very sure I have my passwords correct. One other thing to note is that on the 1st install, I used a different pw for root and regular user. On the 2nd, just to keep is as simple as possibl I used the same pw for root and reg user account. I am new to debian, but the distro that I have been using (slackware)
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