Ubuntu Servers :: SSH Authentication Fails From Outside LAN?
Mar 29, 2010
My first post here. I've been using Ubuntu to run our internal mail server for a while now on Ubuntu server 9.04 and ISPconfig 2. I've read a lot of threads on poeple that have difficulty connecting to their server using SSH from outside the LAN and it is not the same problem I have. Well, not entirely the same.
My problem is that my authentication fails from outside the LAn, but I can connect to the SSH port from outside my LAN. The other threads pointed towards checking the router port forwarding etc, but I can see my SSH log in asking for my username and password. So, at this stage I know the port forwarding worked, otherwise I wouldn't even see the log in prompt.
Has anyone see this before where you can connect, but the authentication fails? I can use the correct username and password from inside the LAN, but using the same credentials from outside fails.
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Mar 14, 2011
On Ubuntu server 10.10, with a relay smtp server with authentication via postfix; I keep getting 535: Incorrect authentication data. I'm sure my username and password is correct. Heres how I set up postfix: I created a file called smarthosts.conf in my /etc/postfix/ directory that contains the following:
[Code].....
my server uses plain text authentication on port 25. I would like to use security like SSL, but this particular server is unsecured.
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Sep 16, 2010
One I cant figure out is a problem of authentication. I'm using open ldap server and try to authenticate a groupware (simple groupware) against it. As it fails, I tested with a ldap client to understand things better. Using GQ ldap client, I 'm able to browse my ldap tree successfully and to search some args from the base DN i specified. but when entering the exact uid as a search string iI got no answer whereas searching the cn returns the correct entry (and display its related entry including the uid I can't find ..) Here is the only thing I can trace in logs (syslog) when trying to seach firstname.lastname (= uid)
[Code]....
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Feb 6, 2010
I'm trying to connect to my Xubuntu box (zelda) remotely using my RSA key. I'm using Cygwin on my Windows box (link) to SSH in to the Xubuntu box. I've created the key and placed it in the authorized_keys file on my remote box. Here's where it gets weird. When I ssh into zelda the first time, it prompts me for my password. However, if I'm already connected to zelda and try to open another connection, it prompts me for my RSA passphrase. This is very confusing, and I have no idea what's going on.Here's my sshd_config file on zelda.
Code:
# Package generated configuration file
# See the sshd(8) manpage for details
[code]...
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Jun 13, 2010
I recently tried installing a new version of VirtualBox PUEL version, after uninstalling an earlier version. But the major issue I have now is that I can no longer modify my User Settings. Clicking on the "Autnenticate" icon gets me a failure notice: "System policy prevents modifying the system configuration", with details reading "Action: org.freedesktop.systemtoolsbackends.set". Hovering over this link says to click on the link to edit the file, but nothing happens. Searching the file system tells me this file does not exist. Prior to this episode with VirtualBox, I had no trouble modifying Users and Groups. I was able to remove a group from the command line, but the cannot get the GUI authorization to work. I have searched the forums and bugs for similar problems, and, although there appear to be a number of similar issues, no where can I find any clear information on how this system is supposed to work, or what I need to do to correct the problem.
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Aug 26, 2015
I upgraded yesterday from Wheezy to Jessie and I don't have any wifi connexion now. The wifi card is working because I see neighbours networks around but WAP authentication fails. I did not change any authentication datas of course.
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Aug 3, 2011
The first time PackageKit Update Applet ran, it asked me for the root passwordI accidentally pressed enter after making a typo, and ever since then Update Appletfails rror:Authorization failedYou have failed to provide correct authentication.Please check any passwords or account settings.Failed to obtain authentication. It never lets me input a new password. Two questions:1) Am I doing something wrong, or is this actually a bug? The possibility has been mentioned in other posts on the topic.2) Where does PackageKit store its files? I'll either change the password myself or delete the file where it's written, hopefully that will trigger PackageKit to ask again.
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Jul 1, 2010
I just upgraded my Ubuntu 8.04 server to 10.04 and now I cannot receive mail on my Ubuntu 10.04 Evolution client, although I can send mail. No errors appear in auth.log or mail.log when I attempt to log in from my Evolution client, in fact mail.log shows 'pop3d-ssl: connection' from my laptop IP, followed by 'pop3d: Disconnected' when the log-in attempts fail.
I'm able to ssh into the server using the same log-on and password as before the upgrade, however I haven't changed the public or private keys in my .ssh directory. I updated the ssl keys in /etc/postfix/ssl but wasn't able to receive mail before or after the update.
The error in the client reads: 'Unable to connect to POP server mail.mydomain.com, error sending username'
I ran this test and the output appears to be related:
Is the pop3 server not running TLS? /etc/postfix/main.cf says it should, and I get no errors restarting / reloading postfix.
I am receiving messages in /home/user/Maildir, but I cannot download them.
I checked for supported authentication types in my Evolution client - 'Password' is the only one supported, as was true before. The client is not using any certificates.
The output of openssl s_client -tls1 -connect 127.0.0.1:995 shows 'certificate has expired' on the 'Verify return code' entry, not sure if that's significant.
What's different about incoming versus outgoing mail authentication?
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Jan 14, 2011
At home in Guangzhou, I have no problem connecting to a WPA-secured wireless router.Now I'm on vacation in another city trying to use a dLink DI-624 router. If I connect immediately after reboot, no problem. If I suspend the session and then wake the machine up again, it will try to connect and then tell me WPA authentication failed.This happens both with network manager and wicd.sysinfo says the network controller is an Atheros AR9285 (ethernet is Realtek RTL8101E/8102E, probably not relevant).Since everything works correctly with routers other than the dLink, I'd have to guess it's not a general wireless configuration problem, nor a wireless card malfunction. Maybe some bad handshaking that manifests only after waking from sleep?More out of curiosity -- I'll only be here for a few weeks and a wired connection is readily available. But, say I end up in a hotel somewhere that uses dLink for WiFi
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Sep 9, 2010
I recently upgraded my video card from a GeForce4 MX 440 AGP 8X to a GeForce FX 5500 AGP 8X. After that my 1360x768 monitor was stuck on a 1024x768 resolution. I ran system-config-display and under Hardware tab I changed the monitor setting from "Generic LCD Screen" to "1360x768 LCD Screen" with the acknowledgment that /etc/X11/xorg.conf file was been modified. After reboot the boot process stuck on:tarting kojid: Kerberos authentication failed. "Resource temporary unavailable" (11) [FAILED]I tried that with both 2.6.34.6-54 and 2.6.34.6-47 kernels available on my system.I use the latest KDE version available for Fedora.
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Sep 16, 2010
I'm running eeebuntu on a Toshiba Satellite R10, I installed the Netbook Remix Package which was apparently a horrible idea. I cant click properly. I tried to open synaptic package manager to uninstall it but it tells me my password is wrong, which i know it is not. Is there anyway to fix this, i can open terminal.
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Sep 2, 2011
I am able to see my samba shares on a windows xp machine, but the username/password combination fails.I setup samba with YaST.firewall is disabled.
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Mar 4, 2010
I am trying o configure phpLDAPadmin on OEL 5 with apache 2.2.14 ,php 5.13 and phpLDAPadmin 1.2.0.4
apache directory = /apache
php directory = /apache/php/
phpLDAPadmin directory = /var/www/phpLDAPadmin 1.2.0.4
I am following the way given in the website : [URL]... but after configuring when i am trying to connect to the site [URL]... Authentication Fails and I am not able to log in with my LDAP user "Manager" I am using openldap version 2.4.21
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Jul 21, 2010
I installed freenx-0.7.3-i486-1alien.tgz on the server (with Slack 12.1), all according to instructions. I installed the no machine nxclient 3.4.0-7 on the client (with Slack 12.2). I ran setup and configured. I used the default no-machine keys, not custom ones. Since authentication failed at the beginning, I enabled DBauthentication, and added my user and password, which seemed to allow authentication to occur.
Here is my node.conf:
# node.conf
#
# This file is provided by FreeNX. It should be placed either into
# /etc/nxserver/node.conf (FreeNX style) or /usr/NX/etc/node.conf
# (NoMachine NX style).....
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May 26, 2011
I am attempting to set up an automatic transfer via sftp using public key authentication. I have created a public/private key pair to connect to the remote server without using a password. I have also been able to use this key pair to login from the command line: sftp -vvv -oPort=<server-side port> user@server.Debug info from interactive command:
Code:
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
[code]...
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Jun 6, 2010
I try to install a server based on Ubuntu. It will provide many different services as SMTP, IMAP, Jabber, SVN(via Apache),maybe a groupware and some other web applications.I'm looking for a way of authenticating the same set of users (a user essentially has a username, a domain it is belonging to and some passwords) against all of the services.What is the most flexible and elegant way? I need a method which is not too bloated (mysql or ldap would be okay) and is easily applyable to all those services and all services which maybe will come later.
I've read some documentation about sasl, mysql-authentication, ldap-authentication, pam, cyrus, apache, ... and i'm somewhat confused now about the proper way.For now I suspect MySQL to be the best method for that, but i'm not sure about the flexibility for embedding it into all the services.
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Mar 16, 2010
i am currently working in a windows server 2003 domain environment and i want to install and configure a ubuntu server 9.10 as a samba file server and i want to allow windows domain users to access the samba shares with windows authentication from the AD , so they can use their windows user names and passwords to access samba shares.i followed the wiki docs and configured kerb5.conf , smb.conf and winbind but i am unable to add the samba pc to the windows domain
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Jun 18, 2010
I've just installed Ubuntu Server for the first time with the goal as setting it up as a proxy server for our Apple computers here since I can get neither ISA of OS X Server's firewall to play properly. So far I have the machine authenticating against our OS X OpenLDAP server and multiple NIC's setup ready to be connected to the outside world. My question is does anyone have a preference on what proxy I should be using? So far my search efforts seem to of turned up Squid Proxy as a favorite among Ubuntu users but I can't seem to work out how to get it authenticating against my OpenLDAP server.
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Aug 23, 2010
I have set up an apache 2 server, but can't seem to get authentication to work properly. I have set up this in my apache2.conf:
Code:
<Directory /var/www>
AllowOverride AuthConfig
</Directory>
<Directory /var/www>
AuthType Basic
[Code]...
I have created the passwords file with htpasswd and defiantly have the right password for bob. However, when I try to log in the box just comes up over and over again and never authenticates. What am I doing wrong? I'm a newbie, so please bear with me if I've missed something really stupid.
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Oct 30, 2010
I have set up a Ubuntu server to handle Dan's Guardian for protection of the children. I need next to set up a centralized file server and some kind of authentication method.
We are dual booting the computers just now since we need to use "Rosetta Stone" language software and they will not release a certain plugin for Linux according to our assigned help person. We also use pure Windows XP in some classrooms for now, and will do so until the school's children gets used to Ubuntu.
So, what is the best authentication method for a mixed environment? Where might I find a Ubuntu "howto" on the method?
What is the best way to set up a file server? Howto? Can the box running Dan's Guardian also be the authentication box and file server? (it is our newest box, only 2 years old and has a large hard drive)
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Nov 4, 2010
To begin, this is the thread that I always use to set up my Ubuntu boxes for AD authentication:
[URL]
I've had this 10.04 server running for about three months with AD authentication running on it perfect. I have multiple Samba shares that authenticate from AD as well. For some reason, this week it decided to completely stop accepting any authentication from AD.
I checked all of my config files, they are all untouched. I have restarted the machine multiple times. I have unjoined and rejoined the domain on the Ubuntu server. I have no audit failures in my security logs on the domain controller.
Output of /var/log/auth.log whenever I try to log on via an AD user:
Code:
Nov 4 11:58:50 caribbean sshd[1869]: Invalid user justin from 10.3.17.12
Nov 4 11:58:50 caribbean sshd[1869]: Failed none for invalid user justin from 10.3.17.12 port 54738 ssh2
Nov 4 11:58:51 caribbean sshd[1869]: pam_winbind(sshd:auth): getting password
[Code].....
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Mar 16, 2011
i am taking another stab at this. The last time i attempted it, it seemed like everyone had a different way to do it, but nobody could give me an answer on how to do it...
I currently have a Domain Controller Running sme server and a domain controller, using ldap as a backend. I have two file servers runing ubuntu 10.04. My overall goal is to have it so when i create a username on the domain controller, it is then automatically copied over to the fileservers. This way everyone will have their own username and password to access the fileservers and ill be able to track what people do on the fileservers.
The next necessity is for me to be able to apply permissions to the folders on the fileserver based on the users that are created on the domain controller.
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Aug 6, 2011
I am running a ubuntu server and want to host a web application (php/mysql based) however I dont want to use usernames and passwords for authentication. I'd like to use a client certificate. The military uses similar technology using the CAC card to provide the certificate for authentication.
not sure if this would be done using the apache modules or if php would be a better place to play with this
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Aug 26, 2011
LDAP Authentication for Web Access I am trying to build a LDAP server to allow access to the wireless network in conjunction with Meraki wireless access points. I am using Ubuntu 10.10 and trying to install OpenLDAP from their documentation but I keep running into the error "configure: error: MozNSS not found - please specify the location to the NSPR and NSS header files in CPPFLAGS and the location to the NSPR and NSS libraries in LDFLAGS (if not in the system location)" I have OpenSSL installed but I also got these when I ran ./configure
checking openssl/ssl.h usability... no
checking openssl/ssl.h presence... no
checking for openssl/ssl.h... no
checking gnutls/gnutls.h usability... no
[code]....
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Jan 29, 2010
I would like to configure Squid and DansGuardian that way, that it's a Proxy with Authentication via Website. That means: A new Notebook gets about DHCP the Network-Information like IP-Adress etc.. When he now tries to open a Internet connection it should check if he's authenticated and if not he should get (if this try is from a browser) a login screen in http. It should also not be possible to have internetconnection without being logged in. The clients are Windoze, Mac and Linux. My question now. What programms/deamons are there for doing this authentication. Would you decide for another Programm instead of Squid?
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Feb 3, 2010
Just installed Alfresco 3.2 using the Canonical repo in Karmic. Unable to find proper guide to enable Active Directory authentication.
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Apr 14, 2010
I would like to know whether ldap can be used to authenticate wireless clients with my server.server and clients are connected to a wireless router and i am able to get wireless adapter work in my ubuntu. Is there any anything extra which is required or the openldap server will work for wireless clients?
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Jul 18, 2010
I have tomcat installed with port forwarding to http port 80. I configure ldap authentication for apache2(/var/www). But I could not configure tomcat for ldap authentication.
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Aug 9, 2010
so I got bugzilla up and running (finally) on an ubuntu server...
but in order to use the ldap integration, you need:
Mozilla::LDAP (aka PerLDAP) Perl module
Mozilla/Netscape LDAP SDK
neither of which exist in the repositories, or anywhere on the internet. the best I could find was a request to build a package from over a year ago...
I did find source that I can build... the Perl module builds and starts to begin the setup process -- but I get stuck at the point where it requires the SDK... which I cannot find anywhere in a plain downloadable form. the one I found seems incomplete:
[URL]
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Nov 18, 2010
I want to connect to the same machine that that I have OpenSSH server on which uses keys and I have disabled password-based logins (for ssh). Apparently, this also affects SFTP which makes sense. How do I setup SFTP to use key-based authentication?
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