Connection Closed Error Ssh
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Ssh Connection Closed Immediately After Login
and rise to the top ssh server: reasons for sudden “Connection closed by remote host” up vote 5 down vote favorite One of my ec2 servers has stopped receiving ssh connections. The OS is Ubuntu server 8.04, and the ssh server is the standard openssh-server. After months of uptime, I tried to connet to it today, and got the following message: ssh_exchange_identification: Connection closed by remote host Any idea what could have went wrong? ssh connection closed by preauth Update: After a reboot, the server started receiving new connections. Disks are below 50% usage. openssh share|improve this question asked Aug 25 '11 at 7:00 Adam Matan 5622819 First thing to do when you see this: try again with ssh -vvv, and look carefully through the output (or post it all for someone else to analyse; your password won't appear, but IP addresses and user names will). –Gilles Aug 25 '11 at 23:46 add a comment| 5 Answers 5 active oldest votes up vote 6 down vote accepted Now that you once again have access, check the log to determine what, if any, clues there are as to why you were blocked. tail -n300 /var/log/auth.log | grep ssh 1 The other thing to remember is that, if it happens again, you can run ssh in verbose mode with the -vvv option, which will return more detailed diagnostic information. From man ssh: -v Verbose mode. Causes ssh to print debugging messages about its progress. This is helpful in debugging connection, authentication, and configuration problems. Multiple -v options increase the verbosity. The maximum is 3. [1] You may need to increase/decrease the amount you tail by (-n) to identify the relevant entries. share|improve this answer edited Aug 25 '11 at 18:57 answered Aug 25 '11 at 18:
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and ssh connection closed by remote host policies of this site About Us Learn more about Stack Overflow the company ssh connection closed by foreign host Business Learn more about hiring developers or posting ads with us Super User Questions Tags Users Badges Unanswered ssh connection closed by 1 Ask Question _ Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute: Sign up Here's how it works: Anybody http://unix.stackexchange.com/questions/19378/ssh-server-reasons-for-sudden-connection-closed-by-remote-host can ask a question Anybody can answer The best answers are voted up and rise to the top Not able to connect with server. Connection closed by remote server up vote 1 down vote favorite 2 I am trying to ssh remote server from my local server. But whenever i run ssh command: ssh root@x.x.x.x I get error: Connection closed by x.x.x.x Output http://superuser.com/questions/630281/not-able-to-connect-with-server-connection-closed-by-remote-server of ssh -v -v -v -v root@x.x.x.x is: OpenSSH_5.9p1 Debian-5ubuntu1.1, OpenSSL 1.0.1 14 Mar 2012 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to x.x.x.x [x.x.x.x] port 22. debug1: Connection established. debug3: Incorrect RSA1 identifier debug3: Could not load "/home/mona/.ssh/id_rsa" as a RSA1 public key debug1: identity file /home/mona/.ssh/id_rsa type 1 debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048 debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048 debug1: identity file /home/mona/.ssh/id_rsa-cert type -1 debug1: identity file /home/mona/.ssh/id_dsa type -1 debug1: identity file /home/mona/.ssh/id_dsa-cert type -1 debug1: identity file /home/mona/.ssh/id_ecdsa type -1 debug1: identity file /home/mona/.ssh/id_ecdsa-cert type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1.1 debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1.1 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.9p1 Debian-5ubuntu1.1 debug2: fd 3 setting O_NONBLOCK debug3: load_hostkeys: loading entries for host "151.236.220.15" from file "/home/mona/.ssh/known_hosts" debug3: load_hostkeys: loaded 0 keys debug1: SSH2_MSG_KEXINIT sent Connection closed by x.x.x.x I have loaded content of my id_rsa.pub in known_hosts keys. I am not able to ssh login. Can anybody help me in this? Will really appreciate i
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the http://stackoverflow.com/questions/18120956/ssh-connection-closed-by-remote-server workings and policies of this site About Us Learn more about Stack https://discussions.apple.com/thread/3008731?tstart=0 Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join connection closed them; it only takes a minute: Sign up SSH: Connection closed by remote server up vote 6 down vote favorite I am trying to ssh login to my remote server. But whenever i try to login through terminal using ssh command: ssh root@{ip_address} I get error: Connection closed by {ip_address} I checked hosts deny and hosts allow, there is ssh connection closed nothing in the file. I am not getting why it happening? It happened when i changed my workstation and key got changed. When i tried ssh login, it asked to add key and i entered yes and then it closed the connection. Is there any way to get connected with ssh again? Your help is appreciated. Thank you. Edit: Output of ssh -v -v -v -v root@{ip_address} is OpenSSH_5.9p1 Debian-5ubuntu1.1, OpenSSL 1.0.1 14 Mar 2012 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to {ip_address} [{ip_address}] port 22. debug1: Connection established. debug3: Incorrect RSA1 identifier debug3: Could not load "/home/mona/.ssh/id_rsa" as a RSA1 public key debug1: identity file /home/mona/.ssh/id_rsa type 1 debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048 debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048 debug1: identity file /home/mona/.ssh/id_rsa-cert type -1 debug1: identity file /home/mona/.ssh/id_dsa type -1 debug1: identity file /home/mona/.ssh/id_dsa-cert type -1 debug1: identity file /home/mona/.ssh/id_ecdsa type -1 debug1: identity file /home/mona/.ssh/id_ecdsa-cert type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1.1 debug1: match: Open
enter a title. You can not post a blank message. Please type your message and try again. JeffMurchison Level 1 (20 points) Q: SSH "connection closed" instantly Alright, I have a feeling this is my own doing as a few months ago I was experimenting with public/private key authentication. Now I can't SSH into one of my work computers. That is, no machine can SSH into it and it can't SSH into itself.When I run the commandssh [myusername]@localhost from the machine in question, I get:Connection closed by ::1 Now, when I runssh -vv [myusername]@localhost I get:OpenSSH_5.2p1, OpenSSL 0.9.8l 5 Nov 2009 debug1: Reading configuration data /etc/ssh_config debug2: ssh_connect: needpriv 0 debug1: Connecting to localhost [::1] port 22. debug1: Connection established. debug1: identity file /Users/pro01/.ssh/identity type -1 debug1: identity file /Users/pro01/.ssh/id_rsa type -1 debug1: identity file /Users/pro01/.ssh/id_dsa type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.2 debug1: match: OpenSSH_5.2 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.2 debug2: fd 3 setting O_NONBLOCK debug1: SSH2_MSG_KEXINIT sent Connection closed by ::1 I've tried searching around but haven't had any luck. Anyone have any ideas as to how I can fix this and get my SSH working again? Mac OS X (10.6.7) Posted on Apr 20, 2011 8:53 AM I have this question too by JeffMurchison,Solvedanswer JeffMurchison Level 1 (20 points) A: Alright, so funny enough I stumbled upon this thread when I encountered the same issue on another computer. This thread was the top result on Google.I did a bit of poking and prodding, looking at the console and logs and verbose output and I figured it out. I figured I would add the answer here in case anyone else has the same issue.The problem was permissions on the file/etc/ssh_host_dsa_keywere set to 777 when they should have been set to 700.Running the following command fixed the issue:sudo chmod 700 /etc/ssh_host_dsa_key Posted on Jan 9, 2012 5:25 PM See the answer in context Close Q: SSH "connection closed" instantly All replies Helpful answers by etresoft, etresoft Apr 20, 2011 9:05 AM in response to JeffMurchison Level 7 (29,298 points) Mac OS X Apr 20, 2011 9:05 AM in response to JeffMurchison What model/make/version are you connecting from and to?Can you connect to a different account on that machine? If so, the problem may be in the one accout's .ssh directory. If ssh doesn't