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• Any way to stop VMWare workstation from dropping SSH connections?

  - by oljones

  I have VMWare workstation 8 with a few Linux guests. I have had problems maintaining an active SSH connection to my VMs when they are in bridged mode. I first read that the onboard realtek network cards were not well supported so I bought a Intel Pro/1000 GT card. This supposedly had support. But this made no difference. Connections via SSH are active for about the first 3 minutes then hang and die. I have changed the TCP Checksum offload on the Intel and Realtek NICs, but this only works some of the time and even then not for very long. The best I could do was about 20 minutes before the connection was dropped. Any ideas?

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• I setup vsftpd on ubuntu server on my ec2 instance, how to connect using SSH?

  - by Blankman

  I connect to my ec2 instance using ssh so I don't have to login each time. I just installed vsftpd on the ubuntu server, but when I connect it obviously asks for my username and password. Since I connect using the ubuntu user that my AMI comes with, I don't even know the root password. Is there a way I can login via ftp using SSH? Or do I just create a user on the system for ftp purposes? I've locked ftp to my IP address, and I will shutdown the ftp service once I'm done as I dont need it running 99.99999% of the time.

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• What's the typical latency for key strokes using an ssh connection on a local wifi network?

  - by dan

  I develop software on a Macbook Air 1.6 Ghz but find running Rails test suites and generators on this computer very slow. I'm thinking about buying a Linux tower to put on my local wireless network to do my Rails development on. I would want to use my Macbook Air and ssh into the Linux box and do my development with Gnu Screen, vim, etc. Can I expect the keystroke and echo latency for a ssh session between two machines on a local wireless network to be negligible? Does anyone develop using this kind of local setup?

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• How to run a script in Ubuntu via SSH as superuser?

  - by Irinotecan

  So I have a script that needs to be executed remotely as root. This isn't a problem with most Linux distros since they have a root account. But since Ubuntu does not, executing anything as root requires a 2-step process of entering the account password twice - once to log in and once for sudo. The SSH process to launch the script is automated, so it cannot pause for user input for the second password request. Does anyone know, short of hacking Ubuntu to re-enable root (not an option), if unattended SSH script execution with superuser privilege on the target machine is possible? Also, having no experience with Debian, does Debian behave this way too?

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• How to restrict ssh port forwarding, without denying it?

  - by Kaz

  Suppose I have created an account whose login shell is actually a script which does not permit an interactive login, and only allows a very limited, specific set of commands to be remotely executed. Nevertheless, ssh allows the user of this account to forward ports, which is a hole. Now, the twist is that I actually want that account to set up a specific port forwarding configuration when the ssh session is established. But it must be impossible configure arbitrary port forwarding. (It is an acceptable solution if the permitted port forwarding configuration is unconditionally established as part of the every session.)

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• Binding services to localhost and using SSH tunnels - can requests be forged?

  - by Martin

  Given a typical webserver, with Apache2, common PHP scripts and a DNS server, would it be sufficient from a security perspective to bind administration interfaces like phpmyadmin to localhost and access it via SSH tunnels? Or could somebody, who knew eg. that phpmyadmin (or any other commonly availible script) is listening at a certain port on localhost easily forge requests that would be executed if no other authentication was present? In other words: could somebody from somewhere in the internet easily forge a request, so that the webserver would accept it, thinking it originated from 127.0.0.1 if the server is listening on 127.0.0.1 only? If there were a risk, could it be somehow dealt with on a lower level than the application, eg. by using iptables? The idea being, that if someone found a weakness in a php script or apache, the network would still block this request because it did not arrive via a SSH-tunnel?

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• Giving SSH access to a user, and security issues.

  - by Kris Sauquillo

  Okay, so I have a VPS and I made an account for a friend so he can host his own domains (using the reseller features in DirectAdmin). He's asking for SSH access, and I know that this is probably a bad idea. Does he have access to my whole server, such as executing commands, accessing my domains that I host on my server? I logged into my SSH using his account details and it let me navigate around all of the root folders/files, and his account is under /home/AccountName/. Is there anyway to restrict his access to his folder only? And the commands he can use?

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• Linux periodically "losing" ability to connect to server via SSH?

  - by gct

  I know this isn't exactly a programming question, but it popped up in my use of git for programming projects at least. I've got a web server that I use to host my git repos on, but my ubuntu box seems to "lose" the ability to connect to it via SSH. I'll get a "connection refused" error when I try to ssh or use git. Rebooting my local machine will fix the problem, but only temporarily. I can still connect to the web interface just fine, and the problem manifests with other servers as well. I've been working around it by pulling my changes over to my laptop and pushing from there, but that's sub-optimal as you can imagine. Has anyone seen something like this? I'd be tempted to say it's some kind of IP caching problem, but I can't connect even using the IP address of the server directly... Running Ubuntu 9.04

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• How can I tell how many bits my ssh key is?

  - by yairchu

  I already created an ssh key for myself sometime in the past. I don't remember "how many bits" it is. How can I tell? I'm wondering because I'm using hosting at nearlyfreespeech.net and their faq says: Can I configure my ssh connection to use a public key? ... we will not install keys that have a length less than 1536 bits ... We prefer that you use a key at least 2048 bits in length, and if you are generating a new key, the recommended length is 4096 bits.

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• How do I use rsync to sync my repo on my mac to university server where I have ssh access?

  - by snihalani

  I need to use my university's ssh access and run my programs there for testing. I don't have sudo access there. It doesn't have vncserver there either. I would work with vim and make but I need git at least. Now I am looking into rsync to sync my current source directory into a remote directory and I'll ssh into the directory and run my make file to test it. I am looking at the man page of rsync and it looks very complicated. Can anyone please help me with this? I have googled in superuser and all commands seem different for different cases. Can anyone please help me with this?

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• How to increase the limit of lines to display in the prompt of SSH?

  - by superuser

  I'm using this product: http://www.ssh.com/ I want to increase the limit to display lines so that it can hold 2000 lines.

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• How can I get the comment of the current authorized_keys ssh key ?

  - by krosenvold

  Edit: What I really need to know WHICH ssh key from authorized_keys has been used to identify the currently logged on user. According to "man sshd": Protocol 2 public key consist of options, keytype, base64-encoded key, comment. I see that when I use ssh-keygen, the comment is usually the local identity of the user. Is there any way to access this value when I'm on the remote computer ? (Kind of like the SSH_CLIENT shell variable) (Assuming I enforce the comment to be a remote identity of some sort, I would like to log this from a shell-script! This is on ubuntu)

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• Is disabling password login for SSH the same as deleting the password for all users?

  - by Arsham Skrenes

  I have a cloud server with only a root user. I SSH to it using RSA keys only. To make it more secure, I wanted to disable the password feature. I know that this can be done by editing the /etc/ssh/sshd_config file and changing PermitRootLogin yes to PermitRootLogin without-password. I was wondering if simply deleting the root password via passwd -d root would be the equivalent (assuming I do not create more users or new users have their passwords deleted too). Are there any security issues with one approach verses the other?

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• What are valid reasons to use SSH on a shared server?

  - by officeboi101

  What are the valid reasons why you need to use SSH on a shared server?

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• How do I change the ssh port to something other than 22?

  - by April

  How do I change the ssh port to something other than 22 on Ubuntu Hardy?

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• How do you assign commands to keys in Terminal?

  - by NES

  Is there a solution to assign special key combinations to words in terminal use. For example the less command is very usefull and i use i a lot to pipe the output of another process through it. The idea would be to set up special key combinations that are only active in terminal use assigned to write different commands? So pressing CTRL + l in terminal window could write | less or CTRL + G could stand for | grep Note: i just mean adding the letters to commandline not execute the finally. A similar way what's tabcompletion but more specific.

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• Why do the Escape and Enter keys not always do the right thing in dialog boxes?

  - by Michael Goldshteyn

  Why is it that when a dialog pops up, the Escape key doesn't always cancel it and the Enter key doesn't always press the default button? Shouldn't this be a standard across all dialog boxes in all applications? I have gotten into the habit of pressing Escape to cancel a dialog and Enter to confirm it, but applications (and especially KDE, GNOME and Unity in many many cases) seem to ignore my wishes. What is the problem? Is consitency too much to ask?

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• How do you assign commands to keys to in Terminal?

  - by NES

  Is there a solution to assign special key combinations to words in terminal use. For example the less command is very usefull and i use i a lot to pipe the output of another process through it. The idea would be to set up special key combinations that are only active in terminal use assigned to write different commands? So pressing CTRL + l in terminal window could write | less or CTRL + G could stand for | grep Note: i just mean adding the letters to commandline not execute the finally. A similar way what's tabcompletion but more specific.

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• Enabling publickey authentication for server's sshd

  - by aaron

  I have two servers running RHEL 5. Both have nearly identical configurations. I have set up RSA Publickey authetication on both, and one works but the other does not: [my_user@client] $ ssh my_user@server1 --- server1 MOTD Banner --- [my_user@server1] $ and on the other server: [my_user@client] $ ssh my_user@server2 my_user@server2's password: --- server2 MOTD Banner --- [my_user@server2] $ server2's /etc/ssh/sshd_config file snippet: RSAAuthentication yes PubkeyAuthentication yes AuthorizedKeysFile .ssh/authorized_keys When I run ssh -vvv I get the following snippet: debug3: authmethod_lookup publickey debug3: remaining preferred: keyboard-interactive,password debug3: authmethod_is_enabled publickey debug3: Next authentication method: publickey debug1: Offering public key: /home/my_user/.ssh/id_rsa debug3: send_pubkey_test debug2: we sent a publickey packet, wait for reply debug1: Authentication that can continue: publickey,gssapi-with-mic,passowrd debug1: Offering public key: /home/my_user/.ssh/id_dsa debug3: send_pubkey_test debug2: we sent a publickey packet, wait for reply debug1: Authentication that can continue: publickey,gssapi-with-mic,passowrd debug3: authmethod_lookup password debug3: remaining preferred: ,password debug3: authmethod_is_enabled password debug1: Next authentication method: password my_user@server2's password:

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• Known Hosts ECDSA Host Key Multiple Domains on One IP

  - by Jonah

  Hello, world!, I have a VPS set up with multiple domain names pointing to it. Arbitrarily, I like to access it via SSH through the domain name I'm dealing with. So for example, if I'm doing something with example1.com, I'll log in with ssh [email protected], and if I'm working with example2.com, I'll log in with ssh [email protected]. They both point to the same user on the same machine. However, because SSH keeps track of the server's fingerprint, it tells me that there is an offending host key, and makes me confirm access. $ ssh [email protected] Warning: the ECDSA host key for 'example2.com' differs from the key for the IP address '123.123.123.123' Offending key for IP in /home/me/.ssh/known_hosts:33 Matching host key in /home/me/.ssh/known_hosts:38 Are you sure you want to continue connecting (yes/no)? Is there a way to ignore this warning? Thanks!

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• How to use sshd_config - PermitUserEnvironment option

  - by laks

  I have client1 and client2 both are linux machines. From client1: client1$ssh root@client2 "env" it displays list of ssh variables from client2. Things I did on client2: I want to add new variable to client2 . So I edited sshd_config to PermitUserEnvironment yes and created a file environment under ssh with following entry Hi=Hello then restart sshd /etc/init.d/sshd Now from client1 trying the same command client1$ssh root@client2 "env" didn't provide the new variable "Hi". ref: http://www.raphink.info/2008/09/forcing-environment-in-ssh.html http://www.netexpertise.eu/en/ssh/environment-variables-and-ssh.html/comment-page-1#comment-1703

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• Unable to use autossh in background even with absolute path

  - by Zagorax

  I would love to set autossh to run at boot adding it to /etc/rc.local. This command works: autossh -i /root/.ssh/id_rsa -R 2522:localhost:22 user@address But, if I add the -f option autossh -f -i /root/.ssh/id_rsa -R 2522:localhost:22 user@address The ssh session is not started. As you can see, I'm using an absolute path for my identity file, so this seems to be a different problem from the one stated here: autossh in background does not work From /var/log/syslog: Oct 18 11:08:39 raspberrypi autossh[2417]: starting ssh (count 1) Oct 18 11:08:39 raspberrypi autossh[2417]: ssh child pid is 2418 Oct 18 11:08:39 raspberrypi autossh[2417]: ssh exited with status 0; autossh exiting I'm using it with debian wheezy on a raspberry pi, autossh version 1.4c. Could it be that it's passing the -f option to ssh instead?

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• what's the difference between /etc/init.d/sshd start and /usr/sbin/sshd?

  - by jasono

  I'm having issues with passwordless ssh. I've checked, double checked and checked again that I have everything set up correctly. Both machines are RHEL6 and when the destination machine first boots up passwordless ssh does not work. If I stop ssh (service sshd stop or /ect/init.d/sshd stop) and then start it directly (/usr/sbin/sshd) passwordless ssh works fine. If I start ssh via the service (service sshd start or /etc/init.d/sshd start) passwordless ssh does not work. Just for testing I've tried commenting out the entire start() function in /etc/init.d/sshd and replace it with /usr/sbin/sshd - that still fails to allow passwordless ssh. I believe that this means that something in the /etc/init.d/sshd file is causing the screw up but I don't know enough about linux to narrow the issue down.

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• linq to sql using foreign keys returning iqueryable(of myEntity]

  - by Gern Blandston

  I'm trying to use Linq to SQL to return an IQueryable(of Project) when using foreign key relationships. Using the below schema, I want to be able to pass in a UserId and get all the projects created for the company the user is associated with. DB tables: Projects Projid ProjCreator FK (UserId from UserInfo table) Companyid FK (CompanyID from Companies table) UserInfo UserID PK Companyid FK Companies CompanyId PK Description I can get the iqueryable(of project) when simply getting the ProjectCreator with this: Return (From p In db.Projects _ Where p.ProjectCreator = Me.UserId) But I'm having trouble getting the syntax to get a iqueryable(of projects) when using foreign keys. Below gives me an IQueryable(of anonymous) but I can't seem to convince it to give me an IQueryable(of project) even if I try to cast it: Dim retval = (From p In db.Projects _ Join c In db.Companies On p.CompanyId Equals c.CompanyId _ Join u In db.UserInfos On u.CompanyId Equals c.CompanyId _ Where u.Login = UserId)

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• MySQL Removing Some Foreign keys

  - by Drew

  I have a table whose primary key is used in several other tables and has several foreign keys to other tables. CREATE TABLE location ( locationID INT NOT NULL AUTO_INCREMENT PRIMARY KEY ... ) ENGINE = InnoDB; CREATE TABLE assignment ( assignmentID INT NOT NULL AUTO_INCREMENT PRIMARY KEY, locationID INT NOT NULL, FOREIGN KEY locationIDX (locationID) REFERENCES location (locationID) ... ) ENGINE = InnoDB; CREATE TABLE assignmentStuff ( ... assignmentID INT NOT NULL, FOREIGN KEY assignmentIDX (assignmentID) REFERENCES assignment (assignmentID) ) ENGINE = InnoDB; The problem is that when I'm trying to drop one of the foreign key columns (ie locationIDX) it gives me an "ERROR 1025 (HY000): Error on rename" error. How can I drop the column in the assignment table above without getting this error?

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