Ssh not accepting public key. 0. Incorrect file permissions on the SSH keys. ssh\id_rsa. 12 I have configured an Ubuntu 10. SSH Public Key - No supported authentication methods available (server sent public key) Ask Question Asked 13 years ago Modified 3 years, 3 months ago Aug 9, 2021 · When you connect to a Linux system for the first time, SSH prompts you to accept the fingerprint of the machines to successfully establish the connection, since you do not have a fingerprint in your “known_hosts” file. com ", to list: the user the hostname (and optionally the public key location, but Oct 29, 2020 · I'm having both client and server running Windows 10, and did the steps according to the following guidelines in both client and server(ssh-keygen, put pub key in server auth keys file): Key-based Jan 28, 2023 · I have a problem with ssh rsa key authentication. It's not clear why it didn't find it, since ssh-keygen generates them in pairs, but I'd suspect something is going wrong with the agent setup. pub - the public key that would go with this private key. ssh/authorized_keys on the server. ssh\authorized_keys file, and attmepted to connect in Filezilla and WinSCP. ssh/authorized_keys on the router, then try to connect with PUTTY, which I've limited to RSA only. SSH key-based authentication doesn't set up Kerberos tickets and/or other standard Windows SSO credentials which SQL server expects to see to authenticate you. Running the connection verbosely offers the Apr 1, 2018 · I use PUTTYGEN to generate a pair of RSA-2048 keys, save the public key at ~/. Jun 17, 2021 · Learn the basics of SSH keys and how to troubleshoot the most common SSH permission issues in this short guide. When I start the WSL, I must start ssh-agent_ eval $(ssh-agent -s) add the key to the ssh-agent: ssh-add ~/. ssh/authorized_keys on M2 has the RSA key as authorized, but still - ssh falls back to password authentication. 8r 8 Feb 2011 debug1: Reading configurat Nov 30, 2023 · Note that this does not work when added to ssh root@192. RESULT: public key authentication works perfectly! QUESTION: The problem is that despite being configured to only accept public key authentication the client still accepts password authentication - why? I am trying to connect my computer to a ssh server (running on Windows 7) using public/private keys. All well and good until one machine stopped accepting key-based logins the other day. com notes: weasel-pageant allows us to reuse the ssh keys that are loaded in PuTTY pageant inside the WSL Sep 20, 2024 · The public key is not successfully authorized in ~/. On another machine, I have used WinSCP and PuTTy generator to generate an authentication key. pub" file with notepad, copy the content and append to . I receive the error "Server refused our key" when I connect to my Amazon Elastic Compute Cloud (Amazon EC2) instance through SSH. I am able to connect bu I created key pair using puttygen. After completing these steps, hduser will be able to login using ssh keys without having to use password authentication on VM B. This Oct 3, 2025 · Find out about OpenSSH Server key-based authentication, generation, and deployment for Windows. 5). 2. That didn't work, I I recently installed ubuntu 10. Fix that using: then try to login again. ssh/authorized_keys using ssh-copy-id. I know that private key authentication works, however I'm looking for public key authentication. Jun 17, 2013 · Have you copied the public key into authorized_key file in your linux machine?: Open the "C:\Documents and Settings\Arpit. On server (Ubuntu 12. For more details refer to the article Set up SSH public key authentication. I'm using an SRX100H2 that is running JUNOS 12. Aug 23, 2011 · I tried to use public key authentication on my new server, and I came across this problem. 10 Essentially, i want to know why SSH can't recognise that my public key is already in the authorized_keys file Many thanks to anyone able to point me in the right direction. Jul 8, 2022 · Turns out, and I am still not quite certain why this happened for this particular host - I do this on dozens of vms a month, but when I executed scp-copy-id root@host, it installed an alternate public key I use for other purposes rather than what I thought was the default ~/. Apr 22, 2021 · I'm trying to connect to Windows through SSH with public key authentication. ssh/server 192. 8r 8 Feb 2011 debug1: Reading configurat You do not have the private key authentication setup correctly. It can be for several reasons, but usually because the ~/. I use putty with pageant. As for the public key, Apr 8, 2016 · I have two non-root users in one Linux server. This usually means that the server is not configured to accept this key to authenticate this user. 10, only when using ssh -oHostKeyAlgorithms+=ssh-rsa msfadmin@192. You can reset the SSH public key by using the below option on Azure portal, you can provide a new public key by generating a new key combination on putty gen. SSH service and public keys are correctly configured for key authentication, but public key authentication is not working. I am having issues setting up OpenSSH for Windows, using public key authentication. If the remote server is unix, ssh logs will normally go to /var/log/syslog or one of the other files in that directory. If greater restrictions on the key type is the cause then they forgot to upgrade ssh-keygen defaults to match. Remember to keep your SSH server and system updated with the latest patches and security updates. I generated a private/public key pair without password on an ubuntu host. We can test this with ssh -T git@github. ssh/authorized_keys file on your Droplets. Oct 6, 2018 · I am stuck trying to get SSH to work from my iMac to my desktop running Ubuntu. But apparently not working. 100 OpenSSH_5. Typically this is caused by bad permissions of your ~/. 5, it was hardcoded in the embedded version of sshd that admin was the only accepted user. com NOTE Means that the public key test was send, but the key was not accepted by the server. This is almost certainly not a problem with WinSCP. The client is a Windows box running PuTTY and the server is a Ubuntu 12. I've combed through the forums for a solution but nothing has worked for me so far. Makes the key transfer process a little less fiddly. Check the server logs for ssh to see if it logged the reason why. Kept the public key in . Get-WindowsCapa Mar 17, 2019 · If you’re experiencing issues with SSHD on Windows 10 not accepting your public key, there are a few steps you can take to troubleshoot the problem. 04 LTS server. pub server4 would copy the current user's key to your new server and update the authorized key file. Debug of the OpenSSH Client reveals: $ ssh -v asa5505-tmp OpenSSH_8. 04LTS desktop install to only allow public key authentication. Dec 12, 2024 · How SSH Keys Work Before diving into troubleshooting, let‘s quickly review how SSH key-based authentication works: There are 3 main methods of authenticating to remote servers over SSH: 1. I added the public SSH key to the authorized_keys file. Password authentication is working, but passwordless authentication is not. 1X46-D10. Aug 30, 2020 · With password authentication, everything works fine; not so with public-key authentication; I've ensured ~/. It is a secure encryption protocol that allows users to access and manage a remote system. exe Apr 17, 2012 · I've been trying to set up Git over SSH and have followed the guides I've seen to the letter. com,ssh-ed25519 That works great fo Server refused our key If you see this message, it means that WinSCP has sent a public key to the server and offered to authenticate with it, and the server has refused to accept authentication. It uses public key authentication by default, but some users may want to use the password. I did that and tried typing ssh localhost, but it still asks me to type in Oct 19, 2011 · My machine recently stopped accepting incoming public key authentication. $ ssh -v -i . Step 1: Open the SSHD Configuration File To begin, open the SSHD configuration file using a text editor. WARNING: use this only if you absolutely trust the IP\hostname you are going to SSH to: ssh -o StrictHostKeyChecking=accept-new mynewserver. Created and secured the administrators_authorized_keys and instead of Administrators:F in the file I had to use Administrateur:F since I use a French Windows. Jun 7, 2019 · On Windows 10 1809, I have enabled the in-built SSH server, and have configured it. Jul 17, 2024 · Solution 2: Enable usage of ssh-rsa Key If you choose to ignore security guidelines and still prefer to use ssh-rsa key then you must explicitly allow this in your SSH server's /etc/ssh/sshd_config file. ssh/config file, with a section " github. I verified that the MD5 checksums match, the account name is correct, and i’m using the correct method (SSH not HTTP). The SSH key not being registered with your GitLab account. The public key is this: ssh-rsa Oct 19, 2025 · If the public key is not in the authorized_keys file, you can copy the key and past it into the file, or use the ssh-copy-id command to automatically add the key to the file. Putty apparently has this available by default. Includes step-by-step instructions, troubleshooting tips, and practical examples for secure … Server refused our key If you see this message, it means that WinSCP has sent a public key to the server and offered to authenticate with it, and the server has refused to accept authentication. 8 (2), require "ssh-rsa" be among the available signature algorithms for public key exchange regardless of the SSH client software you use. Public Key Cryptography – More secure Dec 2, 2023 · This prompt is a key part of SSH’s security mechanism, ensuring that connections to servers are authentic and secure. 04 (A) for authentication from an Ubuntu Server 13. Seems it should be easy but nope, ssh refuses to use anything but a key. 0 Nov 17, 2018 · So I need to log in to a machine using a password instead of a key, which I practically never do. See full list on howtouselinux. Dec 31, 2022 · The ASA5505/6 units I tested, versions 9. Oct 7, 2025 · How to fix Error Permission Denied Publickey step by step guide to let you connect through ssh and also other solution to create a new key. The SSH key not being added to the SSH agent. In that case, ssh reverts to the SCP syntax, which relies on a ~/. I'm not sure what was done to it previously. In this article, we will share two ways to automatically accept the host key when you run the ssh command. 8p1-1 and I am not using PuTTY. Jan 30, 2024 · The ssh_config files in /etc/ssh are also identical and reported below for convenience. While adding the key, make sure it's in a single line and doesn't contain breaks or spaces. You can use that to compare the contents of the ~/. I tried several keys, including the RSA version, but the final outcome is identical. I'm trying to establish a connection using SSH. When running in ve 1 Have you considered using the ssh-copy-id command instead of manually copying keys into the files? For example, running ssh-copy-id -i ~/. 04 (B). ssh/id_rsa if prompted, enter the password Now the connection works. May 11, 2012 · SSH doesn't accept public key, and permissions appear to be correct Asked 12 years, 11 months ago Modified 12 years, 11 months ago Viewed 5k times Mar 23, 2020 · I created a RSA keypair on my local box and copied the public key to my profile in GitLab. Strangely, I can SSH in from my SSH service and public keys are correctly configured for key authentication, but public key authentication is not working. OpenSSH has begun deprecating many of these older algorithms. example. As PUTTY negotiates the session encryption, it prompts to accept the public key provided by the server. 04 and trying to connect to remote servers with SSH, which is failing to connect with public key. I created the DSA keys, then did a ssh-copy-id to the remote server I am having issues setting up OpenSSH for Windows, using public key authentication. Nov 8, 2021 · SSH key essentially is "one hop" authenticator: the system where you placed it authenticates you, but it can't prove your authenticity further to anyone else. (note: we'll enable password authentication while working, but disable it again once everything is in order) As root, open a terminal on VM B Configure sshd_config to temporarily allow password authentication and ensure that your root user can log back in if Jul 23, 2025 · The SSH key not being generated or missing. 2 (4) and 9. May 28, 2008 · I'm trying an SSH auth via public key, which works for several machines, but one single machine keeps not accepting it. This is done with -o StrictHostKeyChecking=accept-new. I used AI provided by ChatGPT to formulate part of this response. This change makes sshd look in a different file based on the username. I copied the p I generated the keys on my client machine and copied to the server's ~/. I downloaded puttygen. Make sure you add the public key to your ~/. ssh -o PreferredAuthentic Nov 4, 2016 · In my case it did not work in the WSL (Windows Subsystem for Linux). I use ssh-keygen to create a key set, log into the remote host and append the public key to . I also made sure to add +ssh-rsa to PubkeyAcceptedKeyTypes but still get the same message. Jul 13, 2022 · What I did was created a key pair within Copssh, imported the private key into Puttygen, made sure the key was in the . ssh/authorized_keys file on the Windows SSH server. First of all, the constellation: The machine which tries to connect: OpenSSH Dec 31, 2020 · In the server /etc/ssh/ssh_config , I've set Code: PasswordAuthentication no restarted the daemon, and from the host copied a public id_rsa. ssh/authorized_keys with proper permission. But you did: ssh github. Feb 6, 2025 · Learn how to generate SSH keys in Linux with our detailed guide. You will obtain the public key fingerprint in the correct format in PuTTYgen in Public key for pasting into OpenSSH authorized_keys file box when your load your private key. Jul 24, 2025 · Encountering a “Permission denied (publickey, …)” error when attempting to connect to a remote server via SSH using key-based authentication is a frequent challenge. Here are what I have done. I have set up the settings in putty correctly and it is using the correct private key file. The public key is this: ssh-rsa Mar 4, 2024 · Checking SSH Public And Private Keys If you forget which private key matches which public key, OpenSSH tools and the PuTTY suite of applications provide a way to generate a public key from a private key. Feb 11, 2025 · When adding an SSH public key to Bitbucket Cloud, the following error appears: Invalid SSH Key , Invalid SSH Key (ssh-keygen) or You must enter a valid public key. Up to QNAP firmware 4. ssh/id_rsa. In this example, we’ll use the Bash shell and the vim editor. ssh directory and/or your authorized_keys file. Actually, I have the some problem (i. ssh/authorized_keys. Diagnostic Steps Verify that the public key authentication is not working via ssh -vvv <username>@hostname and then verify the /etc/ssh/sshd_config file on the host being accessed. Feb 11, 2020 · I have a server (running openssh 8. If I make a SSH connection(key-based authentication) to one particular SSH server under first user, then it succeeds: /* debug messages removed for b I added the public SSH key to the authorized_keys file. exe (client is windows 8). See how to use built-in Windows tools or PowerShell to manage keys. 9p1 Ubuntu-3, OpenSSL 3. Apr 27, 2017 · Trying to ssh on windows server using a public key authentication, but it is not recognizing the public key. The following message can be seen in I know that private key authentication works, however I'm looking for public key authentication. I'm having trouble setting up public key authentication for an SSH server on Ubuntu Server 12. com That follow the ssh uri syntax (also illustrated in "this answer"). ssh/ Also, if you run ssh with the -v flag, and you just log in using your password (whilst expecting it to accept the key), it will show some information about why the key failed. com (without any user). pub. I have this working on my local desktop and can ssh with a key from Unix machines or other OpenSSH for Windows ma Jun 11, 2013 · I'm trying to setup ssh authentication with key files in stead of username/password. 168. ssh/authorized_key in your Linux machine. This typically occurs after setting up SSH keys and attempting the initial connection, or when configurations change. It can be done forcefully, which raises the question of how to force ssh clients to use only password authentication. 04 desktop that I ssh into from a windows machine. ssh localhost should log me in without asking for the password. Sep 2, 2022 · I mean to ssh from a Win 10 + msys2 client (PC1) to a Win 11 + OpenSSH server (PC2). NET and a public key. Jul 18, 2020 · I checked out this post, but it seems like it was written for OSX and/or Windows, and I'm not really sure how to apply it to my situation: GitLab Not Working With SSH-Keys I set up my GitLab instance. Dec 12, 2024 · To resolve this issue please follow the below steps: Reset the SSH configuration. Open a command prompt and Jan 7, 2024 · I created a private/public key with ssh-keygen on the iPhone and scp the pub key to Windows. I followed the usual procedure in PC2 to enable OpenSSH server, via Powershell (as I have successfully done befo Dec 10, 2021 · But debug1: key_load_public: No such file or directory means ssh didn't find . ssh chmod 600 Dec 22, 2023 · According to the ssh debug output, ssh offered my_private_key_ed25519 to the server and the server didn't accept it. Apr 1, 2012 · The GitHub ssh setup mentions testing your GitHub connection with: $ ssh -T git@github. Downgrading fixes the issue. It is relatively unknown, since it's new (added in Openssh 6. , key-based authentication not working any more) after the upgrade to openssh 8. Secure Socket Shell or SSH is a set of different utilities to implement the ssh protocol. com,ssh-ed25519 That works great fo Nov 23, 2015 · Configuring SSH public key authentication on a QNAP NAS can be a bit complicated. I copied the publ Jan 24, 2017 · I have a Digital Ocean droplet I'm trying to give myself ssh access to. com Sep 19, 2020 · You have added your SSH public key to a remote server manually or using ssh-copy-id but still you can’t login using that public key. 9. 200. 2. Oct 31, 2019 · I've installed the Windows 10 ssh package and set up sshd. I've tried added my public key through the Digital Ocean UI. Obviously there has been a change, but the sshd_config is the same as it was and as the other server. Password Authentication – The old-fashioned but most universally supported method is using a password. Logging in with a password works great, but I'm unable to get public-key login to work. Jul 18, 2023 · To set up SSH key-based authentication, you can generate an SSH key pair on the client machine and add the public key to the ~/. Nov 27, 2017 · Anyone else running into this, you'll have to regenerate your keys with the latest version of PuTTYGen. Follow the steps below to resolve the issue. \ssh\ May 13, 2016 · I used puttygen to generate both my public and private key files (ssh2, 2048 bit). 04. I have generated the keys and used the necessary permissions for files: chmod 700 . ssh/authorized_keys file or parent directories have wrong permissions. I have the same authorized_keys file in . 3 LTS), I have put my public key in ~/. e. 1. However, passwords have risks like brute force attacks. Ansd you also mentioned, you created the VM with a username and password, not with an SSH cert. 1p1-2) with sshd_config configured like this to accept only ed25519 keys: PubkeyAcceptedKeyTypes ssh-ed25519-cert-v01@openssh. Mar 13, 2023 · The error message you shared indicates that SSH authentication method being used is public key authentication. Oct 30, 2023 · Have you ever tried to connect to a server via SSH using public key authentication, only to be greeted by the dreaded "permission denied (publickey)" error? I‘ve been there myself many times! In this comprehensive guide, I‘ll explain exactly what causes this common SSH issue and systematically show you the steps to troubleshoot and fix it for good. Once this this done, verify the network security group rules permit SSH traffic: Oct 31, 2019 · So I generated a fresh key into a different file, added the public key to my authorized_keys, added the key to my agent, verified that the agent had the new key, and tried again. Dec 8, 2014 · Public Key - SFTP/SSH passwordless login not working by tester77 » Mon Dec 08, 2014 3:48 am Feb 11, 2025 · When adding an SSH public key to Bitbucket Cloud, the following error appears: Invalid SSH Key , Invalid SSH Key (ssh-keygen) or You must enter a valid public key. I installed and activated the SSH on the windows. 6p1, OpenSSL 0. While common wisdom is not to disable host key checking, there is a built-in option in SSH itself to do this. Add the following lines to your /etc/ssh/sshd_config to explicitly accept the ssh-rsa algorithm in PubkeyAcceptedAlgorithms, HostKeyAlgorithms and PubkeyAcceptedKeyTypes. pub on the When trying to ssh using a public key from a RHEL8 system to some ancient RHEL systems (usually RHEL6), ssh fails using the public key and requests the password. I have an ubuntu 11. Jul 20, 2025 · The SSH client tries all my keys (RSA and ED25519), the Dropbear server still reports it's accepting the publickey authentication, but none of the keys is accepted. v28dsfeeg1qw0zxk8ewvhnuqo3yb7qvzhygpst4nipeesg6f1ixaopxn