Networking :: Ubuntu - No Remote Response From SSH Login Attempt
Dec 29, 2010
I'm setting up an Ubuntu 10.04 system; installed open-ssh. I'll call this box A. I also have an older box B with Debian. From A I can log into B via the usual way (ssh <user>@<IP>). The 1st attempt at this I was presented with the 'unknown host' warnings & elected to accept it. However, from B when I try logging into A there is no response at all -- no warnings, nothing. I have to ctrl-C back to the prompt. I can successfully ping A from B though. I CAN connect to A from a Windows box using PuTTY as an ssh client with all default settings. Once connected I can log in. Why no response from A when trying to log in from B?
am using RHEL 5 ,i would like the system to send me an email for every time some one attempts to login to the server remotely. i have created the emailing script in perl and it works. but i want it to be triggered if someone tries to access the server. how can this be possible
I have set up a user to login remotely to our Red Hat 5 server via SSH. A rule in our department firewall enables this user to login from a single static ip address. The ssh port on our server is 22. I am able to login to port 22 from locations within our department firewall. Our administrator says the firewall configuration is unchanged. The remote user had been successful logging in. But now the remote user gets a Connection Timed Out message, before being asked to authenticate by the server.
I regenerated security keys, but the remote user still gets the connection timed out message. (I can login locally with the new keys). I suspect either a firewall or an authentication problem--inclining a firewall problem. Am I correct? Is there a Linux command to check whether port 22 is available or blocked, prior even to authentication, for login from the user's remote location?
My SSH client for remote machine will sometimes hang. I have to wait until the session is finished hanging, I guess, to login with SSH again. I would get some message about multiple users or something.
I haven't been able to login this time for over 1 day. It's started saying something about Tcl_InitNotifier: unable to start notifier thread. My host can access the machine locally to fix this, but what is going on? Why is this occurring?
I'm running Kubuntu 9.10. In the process of trying to install openafs, I messed w/etc/pam. d/common-auth and /etc/pam.d/common-session. So, now I can't login to my machine. Loging in using the console gives the message module is unknown.I'm unable to log in in recovery-mode: the system freezes at the recovery menu.
I've searched lot on forums but couldn't find a related post. My problem is I want to hide my mail folders when login attempt in Evolution has failed. I dont use Remember password option so everytime I'm prompted for password.
When I give no password and escape that dialog, I can see all the mails that have been already downloaded form my gmail account. If any of you guys know already existing post, please redirect me to that one.
I've never observed this problem neither did any of my colleagues trying to SSH into the same system. If I try logging into my server using a wrong username and then press ^C to terminate or exhaust my password attempts, I am locked out for at least an hour. Is there something I can do on my end to fix this problem?
I keep getting hundreds of SSH failed logins per day. Is there a way with iptables, i can say if a user connects too to port 22 over 8 times in 10 minuntes, then block them for an hour?
A few minutes ago I was using google chrome when suddenly the scroll-lock indicator on my keyboard turned on... I pressed the scroll-lock key, but nothing happened, the light remained. I opened a terminal and ran "top" to find what processes were running when I was automatically logged out. I logged back and checked the logs and found the following entries in my auth.log:
Code: CRON[2971]: pam_unix(cron:session): session opened for user root by (uid=0) CRON[2971]: pam_unix(cron:session): session closed for user root
After reading up about ssh, I understand that it's a protocol used for sending encrypted data over a network. However, I don't understand what's going on when I login to my Ubuntu PC using ssh [over the network]. How does the ssh client application 'know' that it has to take input from one computer and pass it to the other?
EDIT; To put it another way, one could send a mp3 file over ssh right? So instead of the file, what tell the ssh client that the input and output of the computers is what has to be sent?
I have 2 computers with kubuntu 8.10 using vinagre for my remote desktop viewer and x11nc for my server and I am trying to connect remotely through the command line from one computer to login to the startup screen in the other computer. Is this possible, since it looks like my server does not start until after I log in to my desktop screen?
I am interested learning about networks in Linux and prefer to use Ubuntu. I hope the title is reflects what I really need to know. If not sorry about that.I have an requirement, it is to have a server to handle authenticaition of users so generally users can use that server to use specific services such as login (to linux), mail (postfix) and perhaps a file server (to hold user data, lets say what we have on /home/[username])I did some reading, and it looks like I will need LDAP and Kerberos. But I couldn't get a good understanding on how to practically deploy such a service.I would be obliged if some you guys can give me some guidelines on how to achieve my goal. Topics I need to read, books I could refer would be a plus.To tell you some thing about me, I am not a *NIX guy, my knowledge is kinda just above basic.
I recently upgrade my server pc from 11.2 to 11.3 via the net. Everything seems to go through ok. I restarted the PC and now i can not move the mouse or type anything at the login screen.
I can ping the pc fine and i can ssh into it, which tells me the pc is not froozen, just X is?
I am using VNC to login to remote machine (vncserver). My question is; How can I login to remote machine (vncserver) through VNC client, without having to login to vncserver first physical. For better explanation here is an example: If john wnat to login to vncserver remotely first he has to login the vncserver physically then he can login remotely.
I maintain plain vanilla Ubuntu 10.04 systems for several friends. Each machine has only one user, the owner. I use Remote Desktop to instruct and to perform maintenance. Here's my problem:After updating the system, if the kernel has changed, a restart is needed. If I do a restart, I then have to phone the owner to insert his login credentials in the gdm login screen, before I can do anything else via Remote Desktop on that machine.There ought to be a simple way I can avoid the phone call and login myself.
I'd strongly prefer not to use any software that is not included in a plain vanilla Ubuntu 10.04 installation. And I don't want to weaken system security beyond what it is now.Is there a solution? Or, what is the simplest solution?
I cannot use several keys (1,`, q, a, z & Esc) on my keyboard.I have just installed Kubuntu 11.04, AMD64 version via Wubi. Everything went well w/o any errors. At 1st boot, I also logged in w/o errors, and then tried some apps for Office & Network and shut down. The keyboard was still alright at that time. However, The problem started on the 2nd boot after the installation. Those keys do not response in Kubuntu & Windows 7 login screen and even in my PC's BIOS setup.
My laptop model is Dell Lattitude E6410, core i5, Intel HD Graphics, WD HDD 160GB. And I installed on the other partition, not my Windows one.
I have been trying to set up openVPN on a Virtual Machine running Ubuntu 10.04 with the eventual intention of having a closed VPN in the workspace I'm at, and a bridged internet connection out through the server.My initial process/instinct was to go through Webmin. After a fair bit of tooling around making eys/certificates, I was able to get a response (and that's all it was, really) from my windows machine accessing the VPN server. However, in my attempt to bridge the network, I have lost all internet/networking capabilities from the server.Fortunately I am able to access the server directly from the hardware underneath (i.e. I don't need to SSH in or anything), and so I've been attempting to restore the server's networking back to default. I have returned the /etc/network/interfaces file to it's original state (just the loop, and an eth0 on dhcp) and restarted the networking. A check with ifconfig returns what seems to be a working eth0, and the loop (noting else) however I am unable to ping any outside server. When I do, I am given the message:From XXX.XXX.XXX.XXX icmp_seq=1 Destination Host Unreachable(where of course XXX is my IP address).nother VM on the server is able to access the internet just fine, so it's not the overall server hardware...I guess at this point I'm just trying to take steps back,
I can connect to the internet and browse. I'm wired and using DHCP on a Windows network. Updating Ubuntu or downloading programs takes hours for 52MB of updates. Why? I read some articles that mention Network Manager needs to be enabled at the .conf file. Can I edit this using GUI or command line only?
when I try to access any page even small html pages it stays like 3 seconds in HTTP request sent; waiting for response. state..even when I use Lynx locally on the server..bypassing any possible network issues..logs dont show a thing..the server itself is a high end server with nothing running on it apart from apache which is not serving anny clients now, firewall is disabled and hostnamelookups are set to OFF.
The nm-applet starts automatically as it should, and also tries to connect to the local, wireless LAN, but always fails its first attempt. If I click the icon and ask nm-applet to connect again, it always succeeds.
The server, running the wireless LAN, never sees the first attempt to connect, so no wonder this attempt fails. But it would be nice to make it succeed!
I am a new user of Ubuntu...I am trying to use if for a University project. I have installed Ubuntu under a nice new partition and install was smooth. I am using my Belkin F5D8055 v1 USB adapter to connect to my router. The router registers that the IP 192.168.0.3 has connected (thats the IP assigned to the adapter) however even when trying to ping the router (192.168.0.1), I get no response.
My wireless usb will not attempt to connect to my AP even though it shows in ifconfig and iwconfig:further information which i believe may helplspci -v
00:00.0 Host bridge: VIA Technologies, Inc. CN700/VN800/P4M800CE/Pro Host Bridge Subsystem: VIA Technologies, Inc. Device aa08 Flags: bus master, 66MHz, medium devsel, latency 8
& it seems that it's somebody who's at Zhanjiang Ocean University in china I've got the firewall enabled, but how do u set up rules to stealth the server's IP address to make it invisible & disable ssh so only I can log into the server to fix any problems (eithernet cable) not over the net
I was also having a problem with the Shutdown / Reboot sequence taking ages due to using WiFi, WPA2 and mounting SMB shares. I wasted about 4 hours digging around before I finally realised that the solution involved Upstart. 1. Open a terminal and enter:
Code: sudo gedit /etc/init/network-manager.conf 2. Just below the description line add the following:
Code: pre-stop script /etc/init.d/umountnfs.sh end script
3. Save the script and attempt a restart. I don't know if this will work for everyone, or even what version of Upstart you need for it to work, but it cuts my shutdown time from about 2 mins to about 30 seconds.
Note: This has been working for me about 90% of the time. Occasionally though I see that the script ends prematurely due to the TERM signal and I end up with the 2 minute wait again. I've added the following to the /etc/init/network-manager.conf file:
I'm a little stumped on this one so I reaching out to see if anyone here has any idea. I just changed my ISP to Surewest as they're doing fiber straight to the house in my area so I have 8Mbps up and down.
I have my linux box running openssh and I have no problems SSHing into it from my remote laptop at work. I use putty to connect to it and create a tunnel so I can configure my firefox to use it as a SOCKS proxy. The problem is my response time for page loads in firefox is atrocious now. It'll take over a minute to load yahoo.com. The only real differences in my setup now are my ISP and router hardware at home. Previously, I was using the firewall that was built into my AT&T Uverse gateway. Now, I'm using my old Linksys WRT54G v5.0 router with the latest firmware. My linux box is wired directly into it with ethernet. When I run the speed tests from that box I get my correct speeds of 8Mbps up and down with <15ms ping. From what I can tell, all of my router settings are correct.
I am facing issues on few machines but rest all are ok. They have the same config but I don't know what is wrong. I tried as much as I could but couldn't fix it. Here is the rpms installed on this client
[code]...
The same config is working for all clients but have problems with few machines. May be I am doing something wrong in config or testing at very basic level.
Have a Java program which simply connects to a server and gets back the response from the website.
When I use it under Windows environment it runs fine and i receive a Response Code: 200,
Response Message: OK but in UNIX i get Response Code 401, Response Message Unauthorized
In Unix I tried to ping the website using the ping command.
I use putty to connect to a Unix m/c. I don't have any permissions to install any programs so could not install any s/w so i could check if i were able to reach the website.
Is it a Proxy Server related issue ? If yes how do i configure it ?
icmp request from an ip that is in the same network as one of the local interfaces is not responded to, if the ping request is received via an interface in a different network. Is this some security feature?
