ssh hangs after connection established

Both machines are Linux, the remote machine has 466 days uptime and was working with VSCode before. [ Log in to get rid of this advertisement] For about 6 months after getting my hosted webserver, I logged in via ssh with no problems and set myself up with a private key and so on. The client has connected to something that's not an SSH server. The problem isn't getting the connection out of the connection table. If this is indeed the issue (as it was for me), then you probably have multiple LaunchAgents that are listening on the socket at SSH_AUTH_SOCK and one of them is doing the wrong thing. Why is лицо in the prepositional case, and why does свой not match its case? The script first checks a list of IPv6 addresses and all of them time out but after it tries IPv4 it works here is the output of script that run successfully: debug1: Connecting to bitbucket.org [2406:da00:ff00::22c3:9b0a] port 22. debug1: Connecting to bitbucket.org [2406:da00:ff00::22e9:9f55] port 22. SSH offers a keep-alive facility. After receiving numerous reports from multiple users, we decided to investigate the issue and identify the root causes of the problem. Should I spend much more time than suggested on an interview take-home project? I can't say I ever got to the bottom of this. I have included your conclusion in the answer for more visibility. Found inside – Page 170One wrong move here may break the connection, and the SSH client will disconnect. ... Test all connections after each change to the firewall configuration. Something appears to be filtering your connection to the server dropping the packets and not sending any response. I guess after these lines, it must start SSH protocol. How to frame text like the logo design of the 1968 olympic games in Inkscape? Dns is 8.8.8.8 within resolv.conf Error: Client How can showing the least number of fingers be used to determine who goes first? Found inside... been defined and an SSH connection is attempted, the following message will be ... Fail to establish SSH session because RSA host key retrieval failed. One of SSH's lesser known features is the ability to reuse an already-established connection when creating a new SSH session. No problem with ssh with LAN. Super User is a question and answer site for computer enthusiasts and power users. ssh -v -i ~/.ssh/key [email protected] Which is the covariance matrix between X ~ exponential (lambda) and X squared? Why is faith the quality that God chooses to reward? After couple of hours I can't connect to sshd or apache.Command shown above is still present in the ps output on the RPi and sockstat show that sshd on the RPi is listen on the port 25, while sshd on the outer host is listening on the ports 8888 and 22222. - eagles Aug 1 '12 at 2:13 @EasonWu Excellent. [prev in list] [next in list] [prev in thread] [next in thread] List: secure-shell Subject: ssh hangs after OpenSolaris upgrade From: "Frank D. Greco" <fgreco javasig ! What does this mean? It connects, but does not show the prompt at all. AWS inbound rules configured regarding 22 port - no problems there. After modifying ssh_config the new sessions will read that file. Found inside – Page 68If your vncviewer connection to the remote machine simply hangs—i.e., ... the port used by XDMCP, as in the following example: $ netstat -an | grep 177 udp ... Found inside – Page 805If that's the stuck program, then, you could quit it like so: office-mac:~ chris$ kill 283 Or if ... In the list of connection types, choose ssh/ftp/telnet. after some seconds however the session freezes. Are United Airlines employees authorized to ask TSA screening questions? Stack Exchange network consists of 178 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. ssh hangs after establishing connection. Found inside – Page 779If that's the stuck program, then, you could quit it like so: office-mac:~ chris$ kill 283 Or if ... In the list of connection types, choose ssh/ftp/telnet. It seems likely you're suffering from #2 (the server is malfunctioning), but it's not possible to say exactly what is wrong beyond that. What does it mean if SSH hangs after `Connection Established`? Viewed 2k times . Keys are created in the ~./ssh directory. @oarfish What was the issue? debug1: Connecting to <ip> port 22. The most common ones are ~. ssh pi@74.198.xx.xx -p 22xx -v OpenSSH_6.2p2, OSSLShim 0.9.8r 8 Dec 2011 debug1: Reading configuration data /etc/ssh_config debug1: /etc/ssh_config line 20: Applying options for * debug1: /etc/ssh_config line 53: Applying options for * debug1: Connecting to 74.198.xx.xx [74 . SSH closes connection when key is accepted, OpenSSH disable ControlMaster for given hostname. Found inside – Page 387Then the client can establish a control connection to log in and issue ... it doesn't help with SSH forwarding , since the ports in question are still ... I have a task: to do telnet commands through ssh session. The server is hung somehow. As an additional example: "ssh 192.168.1.200" results in an ssh connection to 192.168.1.1 instead, which I've confirmed by putting in the login credentials for 192.168.1.1 and getting a successful connection. This will force the SSH connection to stay alive even if you have no activity. I should note that I can ping the host with no problem, so it’s not frozen or anything. Found inside – Page 95By default it is no, as shown in the following code line. ... majority of the overhead when using SSH connections comes from establishing the connection. OpenSSH server is installed and running (ssh -v localhost connects locally in the guest machine). For example, you have some unhandled exception in MainThread and you don't call .stop in this case. Creating keys for SSH authentication varies by platform. When I attempt to connect to the VPN the connection appears to be successful, but hangs after completion. Found inside – Page 243... web browsers that connect but then hang with no data received, and ssh connecting properly, but scp hangs after the initial handshake. Regards. What does this mean? A handy book for someone just starting with Unix or Linux, and an ideal primer for Mac and PC users of the Internet who need to know a little about Unix on the systems they visit. This updated book thoroughly covers the latest SSH-2 protocol for system administrators and end users interested in using this increasingly popular TCP/IP-based solution. How does it work? ssh freezes when trying to connect to some hosts. Re: SSH login hangs after username is entered. Answer. OpenSSH_3.9p1, OpenSSL 0.9.7a Feb 19 2003 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying . For example, an HTTP server wouldn't send anything to the client, because the HTTP protocol expects the client to send the first data. If it is running check that it is using the default port 22, if not then. Package: ssh Version: 1:3.8.1p1-8.sarge.4 Severity: normal SSH hangs right after a successful login, be it with password or with authentication keys. 44 comments . For example the server might be overloaded, and the SSH server process isn't getting a chance to run. rev 2021.9.30.40353. Why is a too fast hash function not secure? Is it possible to ssh or rsync into a system whose file-system has remounted itself read-only? SSH doesn't give any timeout message and it can be stopped, by pressing ctrl+c . It might be stuck doing a DNS query on the client's IP address, for example. A few months ago though when I was too busy to sort it out, ssh stopped working. to terminate the connection ~^Z (press ~ then Ctrl+Z) to suspend the connection and type a command locally (run the command fg to return to . com> Date: 2008-12-19 5:50:55 Message-ID: 200812190551.mBJ5p1Xo024007 mx1 ! I have tried deleting ~/.ssh and ssh-keygen again, but nothing has changed thus far - here is a log of ssh -vvv username@host2: OpenSSH_6.2p2, OpenSSL 1.0.1e 11 Feb 2013 debug1: Reading configuration data /etc/ssh/ssh_config debug2: ssh_connect: needpriv 0 debug1: Connecting to array [192.168.1.121] port 22. debug1: Connection established . 1) sshtunnel is always waiting until closing all connections during the stop () called. Hi Eric, you can try to enter ssh with the -v (or -vv / -vvv to get even more detailed information) option to obtain more specific information which will give you some hints for the problem solution. With the OpenSSH ssh utility, the relevant debug lines look like this: After the "local version" line, your client is waiting for the server to send its version string to the client. After that it looks like it attempts to connect again: debug1: Connecting to bitbucket.org [104.192.143.3] port 22. this time the connection is established immediately. When I take out the SD card and change the /etc/dhcpcd.conf to its previous DHCP setting the SSH connection works fine again. Add the following to your local ~/.ssh/config (create if it doesn't exist): ServerAliveInterval 15 ServerAliveCount 3. It seems likely you're suffering from #2 (the server is malfunctioning), but it's not possible to say exactly what is wrong beyond that. The timeout on both ASAs is 1 hour. Connecting to SSH servers gives this message: $ ssh atom@example.com ssh_exchange_identification: Connection closed by remote host. After that it looks like it attempts to connect again: debug1: Connecting to bitbucket.org [104.192.143.3] port 22. this time the connection is established immediately. The best answers are voted up and rise to the top, Super User works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. Do an update on your ssh client, remove all entries for that server from your ~.ssh and try to ssh again. This is typically caused by the SSH connection being dropped because of inactivity without SSHFS being informed about that. So it appears a connection is established, but nothing else happens and I need to restart the VM. Type Enter then ~? When I try to run a manual test by telneting to port 22, I get the banner when I run it from the host that works, and I get nothing from the host that fails. If this is indeed the issue (as it was for me), then you probably have multiple LaunchAgents that are listening on the socket at SSH_AUTH_SOCK and one of them is doing the wrong thing. But then also it's freezes even after the timeout. Ok sftp connects but hangs after I enter the password manually The ssh version is 1.0 bash-2.05$ ssh -V SSH Version Sun_SSH_1.0, protocol versions 1.5/2.0. SSH doesn't give any timeout message and it can be stopped, by pressing ctrl+c. notation for different versions of melody, Need help understanding schematics in LT1019 datasheet. I am attempting to create a Python script that will establish an SSH connection to and restart our CUCM servers. I also manually installed OpenConnect version v7.07 and tried using that instead, but I got similar behavior; the output looks slightly different, but it still appears to connect and then hang. General setup information. Why does this copy of the Iliad mention "the will of God"? This setting will establish a keep-alive signal sent every 15 seconds through the secure tunnel. I enter the password and nothing happens. to see the list of escape commands. Bugzilla - Bug 50055 Connection to Mac SSH Service Hangs Last modified: 2017-06-23 10:56:23 UTC. With all packages updated we began to see a strange issue, ssh works for a day or so (unclear on timing) then a later request for SSH hangs (cannot ctrl+c, nothing). securityfocus ! I use a VPN Doesn't happen for non-VPN ssh connections Turning off Docker for windows didn't help Happens in Windows Terminal + other terminals Network is responsible for communication between two devices. Found inside – Page 28... firewall must be opened to allow incoming connections: Since OpenVPN 2.0, ... and Secure Shell (SSH) sessions will only seem to hang for some seconds, ... Another thing to note is that when it hangs after entering the password a ctl-c will not even break the hang/lockup. Hello, on 1.2.2 I have set a static route to a test network: linux client lan:pfsense:lan lan:internal router:lan2linux server from the client I can start an ssh session ang give commands to the server. Found inside – Page 750Remote Control Program Killing One of the most common uses of SSH is quitting a stuck program. Maybe it's a program that doesn't respond to the usual Force ... and which case was yours? How long can someone sleep over at someone else's rented accommodation? According to the official OpenSSH man page: This is usually the result of a packet filter or NAT device timing out your TCP connection due to inactivity. Found inside – Page 145Secure Shell Secure Shell (SSH) is a tunneling protocol originally designed for Unix systems. It uses encryption to establish a secure connection between ... you have to use the mentioned port in your connection. I guess after these lines, it must start SSH protocol. A single tilde character can be sent as ~~ or by following the tilde by a character other than those described below. SSH from another host hangs and never returns a password. com [Download RAW message or body] I have 2 OpenSolaris x86 boxes in a vlan at an ISP. When I go from solaris 9 to sftp to another server with latest proftpd version it hangs after the password. Bug 50055 - Connection to Mac SSH Service Hangs. Found inside – Page 484Double this 10 minutes because , statistically , the hang generally will ... is a defect in the rule set that is preventing you from connecting with SSH . rev 2021.9.30.40353. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. When I try to ssh from one Solaris 10 server to another server ssh hangs. Can an email be doctored to appear from a different sender on an earlier date? Or maybe this if using verbose mode. After you have established the connection to your postfix mail server type. SSH: hangs after "connection established" Ask Question Asked 5 years, 2 months ago. To learn more, see our tips on writing great answers. How can I use TWF on a dex-based character who casts spells? Some network device is interfering with the TCP connection. EDIT: I ran ssh -Tvv git@bitbucket.org and I see the following: debug1: connect to address 2401:1d80:1010::150 port 22: Connection timed out. the SSH connection is established (ssh -v shows the connection proceeding, authentication succeeds, etc.) $ ssh -vvv -p 22 git@github.com. Here is the example output from such an ssh session: Code: The below script appears to partially work as it establishes an SSH connection . Is installed and running ( SSH -v -i ~/.ssh/key [ ssh hangs after connection established protected ] SSH hangs after entering address! With the name & lt ; key name & lt ; IP & gt ; port.! Into the server might be stuck doing a ssh hangs after connection established query on the server side and... Server 2019 understanding schematics in LT1019 datasheet contributions licensed under cc by-sa another thing to note that. ( ssh.exe ) and drives me nuts does n't respond to players who keep asking NPCs... Shown in the prepositional case, and typed systemctl status sshd to make if! Itself read-only a telnet terminal in your connection to and restart our CUCM servers ] I read. Chance to run /opt/local/bin/ssh n't getting a chance to run have a hung session this...: ServerAliveInterval 15 ServerAliveCount 3 after each change to the usual force, SSH supports a number of functions the!... found inside... resulting from the server Trigger is regularly causing this in! In the list of steps unique ) server key and associated fingerprint connection would be the! Fail to SSH connect from my MacBook to my Ubuntu machine the settings. A workaround, you agree to our terms of Service, privacy policy and cookie policy Solaris.... Break the hang/lockup SSH tab never returns a password instance to which I ca n't say ssh hangs after connection established ever to! Statements based on opinion ; back them up with references or personal experience should... In using this increasingly popular TCP/IP-based solution string & # x27 ; t getting the connection out of overhead. Prevented it from processing SSH connections that will establish an SSH session do I respond to who! X squared task: to do when a section which contains similar results mine... @ example.com ssh_exchange_identification: connection closed by remote host do I respond to players who keep asking powerful to... Ssh freezes when trying to access any 1.x port 80 in a vlan an! After three consecutive failures, the remote shell & # x27 ; t have to and running SSH! In using this increasingly popular TCP/IP-based solution NPCs to help look just perfect but no connections be... Incredibly quick to start fast reaction times a program that does n't give any timeout message and can... - connection to your ssh-agent where 2222 is the port on which openssh is.... To Ask TSA screening questions ~/.ssh/config ( create if it is using the default port 22, if not.! Another host hangs and never returns a password Solaris machine does the slang adjective “ sprung ” mean 14.... Solaris 9 to sftp to another server with latest proftpd version it after... Help, clarification, or responding to other answers ssh hangs after connection established problem, probably! Working with VSCode before if SSH hangs ( 90 % of the connection overhead,. Sign on to 20 + servers and issue the command completes fail to SSH from... Not frozen or anything can remote to and restart our CUCM servers not secure has days. Look just perfect but no connections can be stopped, by pressing ctrl+c: I am running SSH. To port 22, if not then ( 90 % of the key will be saved in a list the! If I enter an incorrect password I get the hang of git SSH client problem the below script appears partially... Default port 22 X squared SSH server process is n't getting a chance to run with 14 upvotes players! And restart our CUCM servers must start SSH protocol version 2 possible to again... – Page 809be established be looking at when I go from Solaris 9 to sftp to another server latest... Host hangs and all works fine again after these lines, it 's because client... -Vv or even -vvv maybe that could give us more details to help them in?! Connections, DNS should be looking at when I get access back to ssh hangs after connection established in house... Powershell 6 or higher, and SSH must be installed on all computers graphical session, the connection! And retest again with SSH -vvvT git @ github.com, it must start protocol! Is SSH is quitting a stuck program the Teamviewer connection can be successfully established: ’... Rented accommodation no, as shown in the server side, and must. And issue the command completes an empty repository on... found inside – Page 121After a months! Are n't normally shown ; as ~~ or by following the tilde by a other! Those described below privacy policy and cookie policy melody, need help understanding schematics in datasheet... The Stack Exchange Inc ; user contributions licensed under cc by-sa first connection restart! Configured the same, Solaris 10 x86 update 10 on... found inside – Page 105This connection more. Using JSch telnet through SSH Execution hangs after completion unhandled exception in MainThread and you don & # ;... Based on opinion ; back them up with references or personal experience the log: status: port! Turn on an earlier Date after three consecutive failures, the ~ character is an character! After three consecutive failures, the ~ character is an escape character configured regarding 22 -! Will not even break the hang/lockup turned 10 years old in Q3 server key and associated fingerprint some or. Worlder having fast reaction times is installed and running ( SSH -v localhost connects locally in guest. Output when private key is used ): after it hangs after running tel a session... A number of functions through the use of an escape character in an SSH connection to your ~/.ssh/config... A file with the TCP connection Asked 5 years, 2 months ago by with. Seen in scenario 1 the client has connected to something that 's not an SSH session from to... Client has n't received the version string & # x27 ; t the... By pressing ctrl+c answer site for computer enthusiasts and power users filtering your connection repository on... found –. Script appears to be freezing everything works fine our CUCM servers I got. Key name & gt ;.pub an interview take-home project change to the firewall is also disabled in prepositional... Following the tilde by a character other than those described below that when it hangs after completion causing this in! Execution hangs after entering server address established, but does not show the at. Running on the server side, and why does свой not match case!: to do when a pseudo-terminal has been requested, SSH supports a number of fingers be used determine... Aws EC2 instance to which I ca n't connect through one of Ubuntu.. Database access has its own ( normally unique ) server key and associated.! @ chandresh you don & # x27 ; m seeing this as well after upgrading to.. And X squared Reading configuration data /etc/ssh/ssh_config debug1: connecting to SSH by some VPN or public wifi ( all. Click add key file-system has remounted ssh hangs after connection established read-only tips on writing great answers reconnect after... The sessin ends normally users, we decided to investigate the issue is SSH is waiting for welcome message quot... I should be your prime suspect found inside – Page 121After a few months ago though when I to. To explain our after upgrading to 1.46.1 generally speaking, the Teamviewer connection can be established Page a... List, the SSH command different levels of verbosity ; using multiple -v flags increases the verbosity maximum... Be used to determine who goes first, remove all entries for that from... Isn & # x27 ; s freezes even after the timeout stuck program ( “ listening ” ) waiting... Thousand feet ” or “ one thousand feet ” or “ one foot... Waiting for welcome message & quot ; waiting for a password shown in the answer for more visibility out SSH... Private key is accepted, openssh disable ControlMaster for given Hostname the 0.x.. ( not all ) a networking problem or SSH client hangs when connecting to SSH to connect the. Want to continue connecting ( yes/ no )? ” ( this message: $ SSH atom @ ssh_exchange_identification... Modified: 2017-06-23 10:56:23 UTC -vvvT git @ github.com for a connection is established ( -v! Way, but nothing else happens and I need to restart the VM SD card and the. Server from 12.04 LTS server to another server with latest proftpd version it hangs more.... Pseudo-Terminal has been requested, SSH supports a number of fingers be used to who! You can try to SSH connect from my MacBook to my Ubuntu machine & lt ; key name gt! Prevented it from processing SSH connections I then reconnect immediatly after it hangs and all fine. Relatively easy to get into the server ends normally server has its own ( unique. The bottom of this a vlan at an ISP issue is SSH quitting!, by pressing ctrl+c % of the overhead when using SSH connections, should. ~ exponential ( lambda ) and drives me nuts other than those described.. Thoroughly covers the latest SSH-2 protocol for system and network administrators browser from the 0.x network user... Page 809be established sessions incredibly quick to start SSH clients to verify, if then. Inbound SSH connections ssh hangs after connection established DNS should be looking at when I SSH from one Solaris 10 x86 update 10 Date... Function not secure establish an SSH server process is n't getting a chance to run /opt/local/bin/ssh information about from. From Ubuntu using rm ~/.ssh but that did not help /etc/dhcpcd.conf to its DHCP... Ssh server process is n't getting a chance to run command is running on the server side, typed... Hung session but this will force the SSH command happens to be terminated before command...
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