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  • Ubuntu display warning before shutdown over ssh

    - by gshankar
    Ok I admit it... I stupidly shutdown my remote server via ssh instead of restarting it like I wanted to do :( To prevent me doing a silly again, is there a way to display a warning / confirmation on a shutdown command? (like "Are you sure you want to shut down this server?" yes/no ) OR, can I not allow shutting down (but not restarting because I still might need to do that from time to time) over ssh?

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  • Unable to SSH to a virtualbox Redhat

    - by Rajat
    I am using a MAC and using virtualbox to start a Redhat instance. The instance is started with two adapters (first being NAT, and second being host-only-adapter). The problem is that I am unable to SSH from my Mac to the virtualbox instance using the IP (I am able to ping the IP, though). I checked in the iptables and SSH is allowed (port 22), and sshd daemon is also running. Anything I am missing?

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  • PuTTY: Forcibly terminate an SSH session without closing the window

    - by jjlin
    Is there a way to forcibly terminate an SSH session in PuTTY, short of closing the PuTTY window? For example, in OpenSSH, I can use the ~. escape sequence to kill the connection. This is useful when the SSH session stops responding for some reason, but I don't want to lose any of my current session-specific settings. In that case, I'd like to kill the session and then use Restart Session to reconnect.

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  • VPC SSH port forward into private subnet

    - by CP510
    Ok, so I've been racking my brain for DAYS on this dilema. I have a VPC setup with a public subnet, and a private subnet. The NAT is in place of course. I can connect from SSH into a instance in the public subnet, as well as the NAT. I can even ssh connect to the private instance from the public instance. I changed the SSHD configuration on the private instance to accept both port 22 and an arbitrary port number 1300. That works fine. But I need to set it up so that I can connect to the private instance directly using the 1300 port number, ie. ssh -i keyfile.pem [email protected] -p 1300 and 1.2.3.4 should route it to the internal server 10.10.10.10. Now I heard iptables is the job for this, so I went ahead and researched and played around with some routing with that. These are the rules I have setup on the public instance (not the NAT). I didn't want to use the NAT for this since AWS apperantly pre-configures the NAT instances when you set them up and I heard using iptables can mess that up. *filter :INPUT ACCEPT [129:12186] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [84:10472] -A INPUT -i lo -j ACCEPT -A INPUT -i eth0 -p tcp -m state --state NEW -m tcp --dport 1300 -j ACCEPT -A INPUT -d 10.10.10.10/32 -p tcp -m limit --limit 5/min -j LOG --log-prefix "SSH Dropped: " -A FORWARD -d 10.10.10.10/32 -p tcp -m tcp --dport 1300 -j ACCEPT -A OUTPUT -o lo -j ACCEPT COMMIT # Completed on Wed Apr 17 04:19:29 2013 # Generated by iptables-save v1.4.12 on Wed Apr 17 04:19:29 2013 *nat :PREROUTING ACCEPT [2:104] :INPUT ACCEPT [2:104] :OUTPUT ACCEPT [6:681] :POSTROUTING ACCEPT [7:745] -A PREROUTING -i eth0 -p tcp -m tcp --dport 1300 -j DNAT --to-destination 10.10.10.10:1300 -A POSTROUTING -p tcp -m tcp --dport 1300 -j MASQUERADE COMMIT So when I try this from home. It just times out. No connection refused messages or anything. And I can't seem to find any log messages about dropped packets. My security groups and ACL settings allow communications on these ports in both directions in both subnets and on the NAT. I'm at a loss. What am I doing wrong?

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  • Using www-data through SSH

    - by Fluidbyte
    For development purposes I'm using www-data (on an ubuntu 11.10 server) to ssh in and fire git commands and basic stuff against the webroot. I don't have things like command history, coloring, etc like I do when I ssh in as any other user, so I'm curious how to get this working. I'm assuming I need a `.bashrc' file, but I'm not sure what to include or (more importantly since I could just copy the one from another user) where it goes.

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  • Cannot access the EC2 server - permissions problems, ssh is dead

    - by user1494072
    One of our developers worked on a beta server and accidentally changed the permissions of the whole system (chmod /) to root. Due to that, services are unable to access files, and we can't ssh to the machine (permission denied on the key) (UPDATE: ssh is dead after reboot, probably can't start). Does Amazon has an option to browse files / physically access the machine? Any other creative solution?

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  • SFTP/SSH profile load

    - by Alex
    I have a CentOS 6.2 server. Whenever some one logs into the server using the terminal (SSH) the user profile (.bash_profile) is loaded. Now my question is, is there a profile that loads whenever you use SFTP to login into the server via "FTP browsing software" ( I use WinSCP ), I want to send an email whenever a user logs into the server via SFTP. I already have the code to do this when a user logs into the terminal (SSH) when his profile loads. Thanks

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  • Generating SSH Keys on the Server

    - by mupro
    I have set up sshd on a Linux server and managed to log in via keys generated using ssh-keygen. However, I have made the following observation: When I generate the key pair on the client and copy the public key to the server everythings works fine. But when I generate the key pair on the server and copy the private key to the client I cannot log in. Can anybody explain to me if and why the keys have to be created on the client?

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  • cygwin running commands with switches when ssh in

    - by Troz123
    When I SSH into a Windows 2008 R2 box and try to run a command with switches like /cygdrive/c/directory/Reports.exe /ReportID=1 /DateRange=LastWeek the command just hangs and never finishes. I can see the Reports.exe spawn a process under the user but never finishes. If I RDP into the box open cygwin terminal and run the exact command it works. Any reason why I can't run the command when I SSH in?

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  • Managing servers over ssh with PermitRootLogin=no

    - by rickC
    If I can't ssh as root to each of my servers how can I make modifications in an efficient way? I am not allowed to setup ssh keys or open the sudoers file with NOPASSWD. I can't install puppet or spacewalk. Sometimes when I try to include a sudo command in a script I get the error "no tty present." Has anyone worked in an environment like this?

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  • heroku complaining about my public key created by ssh-keygen2

    - by yuri
    I am trying to access my heroku app from work (windows machine). I installed cygwin on the machine and generated ssh-key as well. However, I get the below error: C:heroku keys:add "C:\cygwin\home\4541450\[email protected]" Uploading ssh public key C:\cygwin\home\4541450\[email protected] Enter your Heroku credentials. Email: [email protected] Password: Uploading ssh public key C:\cygwin\home\c54550\[email protected] ! Contents Invalid public key / Contents Invalid public key / Fingerprint can 't be blank I generated the ssh key with the command below. ssh-keygen2 "[email protected]" -t rsa ssh-keygen is not available with this cygwin.

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  • python and paramiko: how to check if end of ssh tunnel is still alive and reestablish if not?

    - by Christian
    Hello all, I'm trying to achieve the following: I have two hosts A and B. A establishes a remote port forwarding tunnel on B, i.e. B is the one a port is forwarded on to some where else and A is the one that sets up the tunnel. I tried the script rforward.py that ships with paramiko and it works very well so far. (I'm running rforward.py on A, which connects to B and forwards a port of B to somewhere else) However, when B is shutting down, A doesn't seem to recognize it. I'd rather like A to recognize that B is down and to try to reestablish the connection periodically in case B comes up again. Is there a way to do this? Thanks.

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  • ssh_exchange_identification: Connection closed by remote host

    - by Charlie Epps
    First: $ ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa $ cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys Connecting to SSH servers gives this message: $ ssh -vvv localhost OpenSSH_5.3p1, OpenSSL 0.9.8m 25 Feb 2010 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to localhost [127.0.0.1] port 22. debug1: Connection established. debug1: identity file /home/charlie/.ssh/identity type -1 debug1: identity file /home/charlie/.ssh/id_rsa type -1 debug3: Not a RSA1 key file /home/charlie/.ssh/id_dsa. debug2: key_type_from_name: unknown key type '-----BEGIN' debug3: key_read: missing keytype debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug2: key_type_from_name: unknown key type '-----END' debug3: key_read: missing keytype debug1: identity file /home/charlie/.ssh/id_dsa type 2 ssh_exchange_identification: Connection closed by remote host My /etc/hosts.allow is as following: sshd: ALLOW /etc/hosts.deny is as following: ALL: ALL: DENY I have changed my /etc/ssh/sshd_conf as following: ListenAddress 0.0.0.0 Protocol 2 # HostKey for protocol version 1 #HostKey /etc/ssh/ssh_host_key # HostKeys for protocol version 2 HostKey /etc/ssh/ssh_host_rsa_key HostKey /etc/ssh/ssh_host_dsa_key RSAAuthentication yes PubkeyAuthentication yes #AuthorizedKeysFile .ssh/authorized_keys PasswordAuthentication no

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  • SSH service will not start on fresh Cygwin 1.7.15 install

    - by Coder6841
    OS: Windows 7 x64 Cygwin: 1.7.15-1 OpenSSH: 6.0p1-1 I'm attempting to install an SSH server on Windows 7. The tutorial that I'm following to do this is here: http://www.howtogeek.com/howto/41560/how-to-get-ssh-command-line-access-to-windows-7-using-cygwin/ The issue is that upon executing the net start sshd command I get the following output:The CYGWIN sshd service is starting. The CYGWIN sshd service could not be started. The service did not report an error. More help is available by typing NET HELPMSG 3534. Here is the full output of the setup: AdminUser@ThisComputer ~ $ ssh-host-config *** Info: Generating /etc/ssh_host_key *** Info: Generating /etc/ssh_host_rsa_key *** Info: Generating /etc/ssh_host_dsa_key *** Info: Generating /etc/ssh_host_ecdsa_key *** Info: Creating default /etc/ssh_config file *** Info: Creating default /etc/sshd_config file *** Info: Privilege separation is set to yes by default since OpenSSH 3.3. *** Info: However, this requires a non-privileged account called 'sshd'. *** Info: For more info on privilege separation read /usr/share/doc/openssh/README.privsep. *** Query: Should privilege separation be used? (yes/no) yes *** Info: Note that creating a new user requires that the current account have *** Info: Administrator privileges. Should this script attempt to create a *** Query: new local account 'sshd'? (yes/no) yes *** Info: Updating /etc/sshd_config file *** Query: Do you want to install sshd as a service? *** Query: (Say "no" if it is already installed as a service) (yes/no) yes *** Query: Enter the value of CYGWIN for the daemon: [] *** Info: On Windows Server 2003, Windows Vista, and above, the *** Info: SYSTEM account cannot setuid to other users -- a capability *** Info: sshd requires. You need to have or to create a privileged *** Info: account. This script will help you do so. *** Info: You appear to be running Windows XP 64bit, Windows 2003 Server, *** Info: or later. On these systems, it's not possible to use the LocalSystem *** Info: account for services that can change the user id without an *** Info: explicit password (such as passwordless logins [e.g. public key *** Info: authentication] via sshd). *** Info: If you want to enable that functionality, it's required to create *** Info: a new account with special privileges (unless a similar account *** Info: already exists). This account is then used to run these special *** Info: servers. *** Info: Note that creating a new user requires that the current account *** Info: have Administrator privileges itself. *** Info: No privileged account could be found. *** Info: This script plans to use 'cyg_server'. *** Info: 'cyg_server' will only be used by registered services. *** Query: Do you want to use a different name? (yes/no) no *** Query: Create new privileged user account 'cyg_server'? (yes/no) yes *** Info: Please enter a password for new user cyg_server. Please be sure *** Info: that this password matches the password rules given on your system. *** Info: Entering no password will exit the configuration. *** Query: Please enter the password: *** Query: Reenter: *** Info: User 'cyg_server' has been created with password '[CENSORED]'. *** Info: If you change the password, please remember also to change the *** Info: password for the installed services which use (or will soon use) *** Info: the 'cyg_server' account. *** Info: Also keep in mind that the user 'cyg_server' needs read permissions *** Info: on all users' relevant files for the services running as 'cyg_server'. *** Info: In particular, for the sshd server all users' .ssh/authorized_keys *** Info: files must have appropriate permissions to allow public key *** Info: authentication. (Re-)running ssh-user-config for each user will set *** Info: these permissions correctly. [Similar restrictions apply, for *** Info: instance, for .rhosts files if the rshd server is running, etc]. *** Info: The sshd service has been installed under the 'cyg_server' *** Info: account. To start the service now, call `net start sshd' or *** Info: `cygrunsrv -S sshd'. Otherwise, it will start automatically *** Info: after the next reboot. *** Info: Host configuration finished. Have fun! AdminUser@ThisComputer ~ $ net start sshd The CYGWIN sshd service is starting. The CYGWIN sshd service could not be started. The service did not report an error. More help is available by typing NET HELPMSG 3534. Note that on the line *** Query: Enter the value of CYGWIN for the daemon: [] I haven't entered anything. Tutorials often say to use ntsec or ntsec tty here but those options are removed from the latest version of OpenSSH. I've tried using them anyway and the result is the same. The file /var/log/sshd.log is empty. If I try just running the command /usr/sbin/sshd I get the output /var/empty must be owned by root and not group or world-writable.. The /var/empty directory has the following permissions: drwxr-xr-x+ 1 cyg_server root 0 May 29 15:28 empty. Google searches on this error did not turn up any working fixes. One person seems to have solved it by using the command chown SYSTEM /var/empty but that did not fix it in my case.

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  • If I scp a file through an intermediate server, is the file stored temporarily on the server?

    - by Blacklight Shining
    For the sake of simplicity (I find it easier to remember names than arbitrary letters), I will dispense with letters and use names to refer to the machines in this scenario. Say I have two machines, applejack and pinkie-pie, each on their own separate LANs and not in the same physical location. I also have a server, cadance, with a direct Internet-facing connection. I want to copy a file from applejack to pinkie-pie, so to avoid dealing with port forwarding and such, I set up an ssh tunnel from pinkie-pie to cadance (ssh -R etc cadance). Now I can connect to pinkie-pie from anywhere, by connecting to cadance and specifying an alternate port to use. I can also easily copy files to pinkie-pie with scp -P $that_port $some_file cadance:$some_path. My understanding of how it works is this: A secure connection is made from applejack to cadance I am authenticated to cadance A secure connection is made from applejack to pinkie-pie that spans the existing reverse tunnel and the new connection from step 1. I am authenticated to pinkie-pie Files are copied directly from applejack to pinkie-pie over this connection. Am I correct here? How secure is this approach? If I'm wrong…are files copied this way decrypted at cadance before being passed on to pinkie-pie? Is there a possibility that traces of unencrypted data could remain on cadance?

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  • Technology mash: is this possible?

    - by Jon Story
    I'm in the process of setting up my own DNS+hosting on a couple of VPS and my home machines, mostly for academic/learning purposes, but also for convenient accessing of my files, hosting my personal websites, private git repositories etc. I've got a main web server with DNS, and a slave DNS server. I've also got a couple of machines at home doing file hosting, video streaming and all that fun stuff. I'm intending to use my VPS's to provide myself with a dynamic DNS system so that I can point mydomain.com at my DNS servers, with home.mydomain.com going into my home network via a raspberry pi. HOWEVER.... I've not got access to the network infrastructure at home (rented accommodation with managed internet), so I can't forward the ports on the router to my own machines. As such, I'm wondering if it's possible to route all the traffic via an SSH/HTTP tunnel through one of the VPS? My plan is to have the raspberry pi provide a VPN into my home network. The raspberry pi uses SSH to connect to the VPS, and the VPS forwards any traffic to home.mydomain.com via the tunnel to the raspberry pi. Is this even possible, and how do I go about it? I don't mind getting my hands dirty with coding and low level tools, I'm just not sure where to start or what the best way to go about it is.

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  • iptables (NAT/PAT) setup for SSH & Samba

    - by IanVaughan
    I need to access a Linux box via SSH & Samba that is hidden/connected behind another one. Setup :- A switch B C |----| |---| |----| |----| |eth0|----| |----|eth0| | | |----| |---| |eth1|----|eth1| |----| |----| Eg, SSH/Samba from A to C How does one go about this? I was thinking that it cannot be done via IP alone? Or can it? Could B say "hi on eth0, if your looking for 192.168.0.2, its here on eth1"? Is this NAT? This is a large private network, so what about if another PC has that IP?! More likely it would be PAT? A would say "hi 192.168.109.15:1234" B would say "hi on eth0, traffic for port 1234 goes on here eth1" How could that be done? And would the SSH/Samba demons see the correct packet header info and work?? IP info :- A - eth0 - 192.168.109.2 B - eth0 - 192.168.109.15 - eth1 - 192.168.0.1 C - eth1 - 192.168.0.2 A, B & C are RHEL (RedHat) But Windows computers can be connected to the switch. I configured the 192.168.0.* IPs, they are changeable. Any help?

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  • Encoding over SSH Issues

    - by user1104160
    I have a Linux machine and a Windows machine, both using Vim with the Powerline plugin. They both work great with patched fonts. Next, I want to SSH onto an OSX 10.6 machine and also use the Powerline in the terminal with Vim. However, I get weird symbols with normal mode ("^^B" in one area) and fancy mode ("~@" and "~B" spread throughout the bar. I thought this mixup was an encoding issue, but when I look at Putty's encoding it is using UTF-8 and the same with the Ubuntu terminal. Additionally, on the OSX machine, "locale" returns "en_US.UTF-8" for all variables (I set it to do that in order to troubleshoot). However, the symbols are still showing. I am using a patched font (Inconsolata, the same one as the Ubuntu terminal) for the OSX terminal, so I am stumped. Is there a missing component to this equation? Are there additional problems that can arise from SSH encoding? On the OSX end, additionally, these same symbols appear, so it may not even be related to SSH and therefore I'm totally lost.

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  • ssh key questions

    - by Tim
    I have some questions regarding generating keys for ssh access: (1) Supposed there are two computers running ssh server service and I have generated a pair of key files on computer A and copy the public file to computer B. Is it true that this is only a one-way key: We only gave computer A permission to access computer B, not gave computer B permission to access computer A? If I now want to ssh from computer B to computer A, must I generat another pair of key files on computer B and copy the public file to computer A? (2) If I would like to connect a single local computer to several remote servers, is it to generate a common pair of key files only once on the local and copy the same public file to the remote servers, or to generate different pair of key files on the local for different remote servers? (3) If I would like to connect several local computers to a single remote server, when copying the public files from different local computers to the remote server, is it to combine them together into a single authorized_keys file or store them in different authorized_keys files? (4) If there are several servers shared the same file system by, for example, NFS, how to generate keys and arrange the key files for accessing from one server to the other? Also how to still generate keys and arrange the key files for a local computer to access anyone of the servers? All the machines above are Linux.Please provide examples and commands in your reply so that I can better understand how to solve the problems. Thanks and regards!

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  • Start and shutdown tomcat via ssh

    - by bxshi
    Updated I find out that the path of jdk it using is wrong. eval: 1: /opt/Java/jdk1.6.0_25/jre/bin/java: not found the Java should be lower case java, how is that happen? When I run this script directly on server, it is just okay. I'm trying to start or shutdown tomcat via a remote client. On my server, I've got 3 different tomcat: tomcat1, tomcat2, and tomcat3. Firstly, I've tried to run tomcat_path/bin/shutdown.sh to stop it via ssh, and the command is ssh [email protected] "cd /home/jake/tomcat2/bin;exec bash ./shutdown.sh" both " and ' are tried, but do not work, the output is eval: 1: /opt/Java/jdk1.6.0_25/jre/bin/java: not found it seems that the shell script runs on my local client, because on server it has this file. Is there any way to run a shell script on remote server correctly? updated I've run ssh [email protected] "sh -x /home/jake/tomcat/bin/shutdown.sh > /home/jake/tomcat.log 2>&1" and the output in tomcat.log is : + PRG=/home/jake/tomcat/bin/shutdown.sh + [ -h /home/jake/tomcat/bin/shutdown.sh ] + dirname /home/jake/tomcat/bin/shutdown.sh + PRGDIR=/home/jake/tomcat/bin + EXECUTABLE=catalina.sh + [ ! -x /home/jake/tomcat/bin/catalina.sh ] + exec /home/jake/tomcat/bin/catalina.sh stop eval: 1: /opt/Java/jdk1.6.0_25/jre/bin/java: not found

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  • Gerrit ssh key setup on windows server

    - by hotpotato
    I am attempting to configure google's 'Gerrit' code review web app on a Windows server 2008 virtual machine on our internal network. We are using Apache Tomcat (6.0.36) to host the web app and have deployed the gerrit.war to tomcats webapp folder, setup the context.xml, web.xml etc for the web app correctly i believe. However when i startup Tomcat using the $CATALINA_HOME/bin/startup.bat i get the following message in the tomcat logs: *Dec 07, 2012 1:03:54 PM org.apache.catalina.core.StandardContext listenerStart SEVERE: Exception sending context initialized event to listener instance of class com.google.gerrit.httpd.WebAppInitializer com.google.inject.CreationException: Guice creation errors:* 1) No SSH keys under C:\Gerrit\config\etc while locating com.google.gerrit.sshd.HostKeyProvider at com.google.gerrit.sshd.SshModule.configure(SshModule.java:90) I have created a is_rsa.pub SSH key and placed it in the specified directory to no avail. I have been googling this for about a week now and can't seem to find any information about the file or format it is expecting... documentation on setting gerrit up on windows seems hard to come by! Can anyone provide useful information about how to correctly configure a host SSH key in this context?

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