Questions tagged [ssh]
SSH (Secure SHell) is a protocol for securely running commands on a remote computer. Use this tag for questions about configuring, using and trouble-shooting SSH client and server software.
8,223 questions
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Irregular SSH dropped connections on Maxstartups
Good afternoon,
I'm running OpenSSH_10.0p2 Debian-7, OpenSSL 3.5.4 30 Sep 2025 on a Debian 13 6.12.57-1 (2025-11-05) VPS server. The connection is fine. However, I see irregular dropped connections on ...
- 225
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How can I fix "kex_exchange_identification: read: Connection reset by peer"?
I have 2 remote servers, both can be connected to ssh well.
Today I rebooted one remote server remotely, and then ssh client in my mac laptop can't connect to this remote server with the error saying '...
- 253
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Cannot ssh from laptop to Kali Virtual server on desktop
I just install a Kali server on my desktop using VMWare. The VMWare image has been setup to us a NAT network.
Using the ifconfig command on the Kali server, I know my IP address of the Kali server, it'...
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57
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Controlling wifi power save
On some of my server systems (Debian trixie), wifi power saving causes "laggy" terminal response on the client side of the SSH connection. By "laggy" I mean that there is an ...
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DNS resolution with reverse proxy connection after server migration
I got a small setup with two private servers ps1 and ps2 at home behind a NAT. One server s1 with public domain s1.com is a small rented vps where I set up as reverse proxy with caddy.
On ps1 I had a ...
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Show vsock for ssh
Fedora server said
But when I try it from host
ssh vsock%1
ssh: Could not resolve hostname vsock%1: Name or service not known
Question: how to see the vsocks?
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SSH Timeout when trying to connect to Oracle Cloud
I made a Compute Instance with Oracle Cloud because I'm trying to run a python code 24/0. I have tried connecting to it all day with no results. Here's what went off in the PowerShell:PS C:\Users\...
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218
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sshfs to a host requiring OTP pw
In my environment I have:
a Jenkins build server that I can ssh into using private/public keys. I can use sshfs to mount its file system on my local pc (running WSL on Windows 11, ugh but I can't ...
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SSH from Windows to Linux, when something is piped into it, gets stuck and stop showing STDOUT
I'm an SSH scripting novice, so I'm trying to understand whether I'm just doing it wrong or there is an issue.
Background: I'm trying to connect VSCode RemoteSSH to HuggingFace Space dev mode and ...
- 191
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66
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How do I stop a sftp-chrooted user from escaping by changing its username?
I have 2 users and their distinct ssh keys, and a ssh server only accepting keys
user_1: a normal account with ssh and sftp accesses. Trusted. It can escape its home and download anything it can read....
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149
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SSH login fail after security test from scanner
We have a nessus scanner at work, this machine is browsing the whole infrastructure to spot security holes and other issues.
I have a curious behavior on one of my debian 12 machines after a corrupted ...
- 1,236
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55
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ssh in mac error out suddently with ssh usage error message
My .ksh scripts in my mac usually run successfully, and until yesterday were initiating an ssh connection with the following command successfully:
ssh -o StrictHostKeychecking=no -o ...
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why do my ssh connections keep timing out with `mux_client_request_session`?
I’ve been running into a frustrating issue with SSH connections lately and could use some advice or insight. When I SSH into a few of our servers, the connection drops with an error like:
...
- 111
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"error in libcrypto" for ssh-add with git-bash (mingw32) on Windows 11
I have a problem with SSH key usage for GIT on windows.
It works fine from windows GUI git clients.
From the terminal - git-bash / mingw32 - it fails with
$ git pull
git@<gitserver redacted>: ...
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Use numbered file descriptors with SSH
I need to pipe data through SSH to a command that reads stdin. The command needs to run with sudo so I need to be able enter the sudo password, too. Without ssh, I'd use numbered file descriptors like ...
- 434
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How do I set ssh to automatically utilize a key in ~/.ssh/id_rsa for a particular host?
I set up an SSH key using GNOME's Seahorse, also known as Passwords and Secrets. The application appears to have saved the private key to ~/.ssh/id_rsa.
I have copied the public key to the server ...
- 339
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271
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How do I set my SSH password/key for Pika Backup?
I made an account with rsync.net for backups but am having issues setting them up with the GNOME Project's Pika Backup.
I set the location as: ssh://<username>@<username>.rsync.net/~/...
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351
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Error 44 trying to rsync over ssh on Synology DSM
This is a bit long winded but I want to give as much information as I can. I have a Synology NAS running DSM 7.2.2:
steve@NAS:/volume1/docker/backuppc-mdns$ cat /proc/sys/kernel/syno_hw_version
DS223j
...
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294
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SSH connection over from LAN to WireGuard VPN Peer drops after ~1 minute despite keepalive settings
I have a device connected to my home network that wants to SSH via WireGuard VPN Peer. The VPN subnet is 10.0.0.x/24.
The issue is:
I can successfully connect to the device via SSH.
The SSH session ...
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Why is ssh-agent ignoring the lifetime in .ssh/config?
I can't get ssh-agent to work like I want to. It keeps removing the saved identities on reboot.
I use AddKeysToAgent in my .ssh/config like this:
AddKeysToAgent 30w
That's the top of the file, ...
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149
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Invalid characters in ssh sessions
I'm opening an SSH session from Fedora to Raspberry Pi OS. Accented and special characters are replaced with question marks. Preferably I would like to learn to solve this without changing the server'...
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ssh client automatically reject unknown host key
Is there a way to do this? My web search didn't find one. I'm familiar with StrictHostKeyChecking but there doesn't appear to be an "automatically reject" option. I'm wanting to move to ...
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Slow SSH tunnel data transfer when combining two SSH connections
I have a server called publicserver on the public internet, and a second server (called privateserver) behind a NAT firewall. I also have a client PC (client, running Linux) behind another NAT ...
- 288
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Upgraded Debian Bookworm to Trixie, ssh login now hanging for 10 seconds
As the title says. Upgraded Bookworm > Trixie, and now ssh is hanging 10 seconds at login, via home local network, when it never used to.
2025-08-17T16:07:29.828339+10:00 debian sshd-session[4260]: ...
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How to upgrade Debian Bookworm OpenSSH package(s) to be able to upgrade to Trixie via SSH without the risk of interruption?
When reading up issues to be aware of for Trixie, specifically interrupted remote upgrades (SSH), caught my eye.
I have one server I wanted to upgrade, to which I do have physical access, so this ...
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Why can't download directory recursively with scp from remote Win10 to linux?
In my home local area network,Win10 is 192.168.28.242,debian is 192.168.28.252.SSH Server is installed on Win10 ,SSH service is on.I can connect Win10 from debian.
debian@MiWiFi-R4A-srv:~$ ssh hello@...
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SSH from Windows into Linux using Pubkey, getting Permission Denied (publickey)
I am working on getting headless Raspberry Pi running Ubuntu Server 25.04. I haven't done this in a while and... passwords are no longer a thing, which is frustrating, but understandable.
I have ...
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sshd service doesn’t start when booting Arch Linux
I installed OpenSSH, but the SSH server sshd doesn't start automatically on boot.
I can start sshd manually without any issues.
sudo /usr/bin/sshd
Starts;
[john2@archlinux2 work]$ sudo systemctl ...
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Running sshfs through ssh proxy and passing in passwords: why does this work?
I have a remote machine that I must access through a proxy, and so I have set up the remote's ssh alias like so:
Host server
HostName server-ip
User my-username
ProxyCommand ssh my-proxy-...
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143
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Tmux pane with long-running session using wrong character set?
Today I connected to a long-running process in tmux over ssh for work, to find that the pane the process was running in seems to have started using the wrong character encoding for its output, leading ...
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Check if multiple files exist on a remote server
I am writing a script that locates a special type of file on my system and I want to check if those files are also present on a remote machine.
So to test a single file I use:
ssh -T user@host [[ -f /...
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Is it redundant or useful to add a UFW rule to deny root when ssh already does?
I manage a Debian (Bookworm) host. The sshd config is set to disallow login as root. I've tested that one cannot login as root, as expected.
However, I see hundreds of login attempts daily as root in /...
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How to allow rsync via ssh to a specific directory only
I want to allow moving files to a specific directory on my server using rsync + ssh.
However, I don't want to fully trust the users using that SSH user.
One solution I found is to set the shell of the ...
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Remote SSH Vscode plugin giving Permission Denied when running installation binary
I am getting a Permission denied error when using the Remote SSH plugin in VSCode to install VSCode server. Below is the version information:
Version: 1.102.1 (Universal)
Commit: ...
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117
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Restrict ssh access to single host per user
I am trying to restrict SSH for a user to a specific host:
I would like userA to be able to SSH to any host, allowing only pubkey authentication, and only if the connection comes from 192.168.1.17. I'...
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Issue with SSH connection in Mac
I'm trying to ssh to a remote server. But after the ssh is successful the connection freezes within 2-3 minutes and eventually drops.
On checking packet trace i observed my mac is randomly sending a ...
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terminal after ssh only return 4 line stdout
So, I did a certification lab lately and after I logged in my ssh, I cannot use a command longer than X line (4 in F server lab and 29 in C server lab. My host kali machine is working and I've tried ...
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Connect to docker container through host via ssh without RemoteCommand
I have a server that runs multiple docker containers. I can access my server via SSH, and have set up my ssh_config to allow me to ssh into certain containers that I regularly access:
Host ...
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125
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SSH logging to external syslog server
I am using CentOS 10, and I am trying to send the SSH logs to an external syslog server listening on port UDP 514. I changed the default logging facility of sshd to local2 and tested it locally and it ...
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SSH multiplexing + control master when network connection changes
I have a computer server and a laptop guest, both running Ubuntu.
I set SSH multiplexing and control master in the laptop's .ssh/config like the following:
Host servername
User username
Port 22
...
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Remote control of GRUB?
Is there any way to remote control GRUB?
I am interested in not having to walk to the machine when it reboots. As such, I am only interested in non-virtualized solutions.
In particular, I want remote ...
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Unable to write to client over ssh
Preface
I am unable to write to my client user connected over SSH. No issues with users on server.
I run as root, and SELinux is disabled for all the tests below(sudo setenforce 0). Yet, I always get ...
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Disabling local accounts SSH in all Linux servers
We are in a process of Disabling local accounts SSH completely in our environment for all linux servers, We are able to disable this in combination of DSC & Azure policy which all working fine.
...
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SSH X11 Forwarding - GUI Crashes with X Error of failed request: BadIDChoice
I am:
Running a program on a Ubuntu 20.04 AWS instance
Using SSH & X11 forwarding in PuTTY, with the VcXsrv X-server, to run program GUIs on my local Windows 11 machine
The GUIs of test programs ...
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Rhel 9 SSH giving ssh_dispatch-run-fatal error
I'm trying to connect to a RHEL9 VM using ssh.
When attempting, it gives the error:
Connection closed by xxx.xxx.xxx.xxx port 22
I checked the /var/logs/secure log and found the following error
...
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111
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Unable to see when user logged in via VSCode
I have a server that a few people log in to but I realized that when checking with last and lastlog that it doesn't list ssh done with VSCode but it works for people who use the terminal. How can I ...
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125
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Unmounted USB drive, plugged in but I need access remotely
I unmounted my 2TB Samsung SSD, before I went on holiday (meaning to bring it with me but I forgot). I have remote SSH access but I can't find a way that will work for an up-to-date kernel (OpenSuse ...
- 123
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HAproxy 2.6.12 TCP LB with NoMachine NX servers (SSH-like)
I tried to install HAProxy 2.6.12 in TCP mode to do load balancing (round robin) between 2 NoMachine 8.16.1 ECS (Enterprise Cloud Server) accepting NX protocol (SSH-like).
NoMachine is a remote ...
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262
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AlmaLinux 9 : How to set up existing SSH keys for root (Or rather, why is this current set up not working?)
I have an Alma Linux 9 server machine with SSH root access through a custom port.
The access is fine but should be with SSH Keys.
We have keys, but we need to give the Public Key to the AlmaLinux ...
- 143
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Arch Linux - rsync succeeds but prsync does not work
I am moving a large number of files from one PC to another. The two PCs are in 192.168.0.0/24. I started by ryncing all music I had on my source PC to my new PC.
> rsync -P --recursive 192.168.0....
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