I want my existing ec2 instance to replace the keys and create New keys.
I don't want to reboot and detach/attach the volumes of ec2 instance. Is there any way to change the key pairs without creating the image/snapshot of the server?
Using keypairs with SSH is a function of the operating system. It has nothing specific to do with Amazon EC2.
When you use SSH to connect to an instance, you provide a private key. The Linux operating system on the target computer/instance will then look in the designated user's home directory and look in the ~/.ssh/authorized_keys file. If a matching public key is found in that directory, the login is permitted.
For example, if you are connecting with:
ssh -i key.pem ec2-user#IP-ADDRESS
then it will look in:
/home/ec2-user/.ssh/authorized_keys
Therefore, if you wish to add/replace keys for a user, simply edit the contents of the .ssh/authorized_keys file in the home directory.
See:
How to replace public SSH keys on your AWS EC2 instance | VentureBeat
Add New User Accounts with SSH Access to an Amazon EC2 Linux Instance
Whenever I try to access AWS instance by using ssh I the following error:
Connection blocked because server only allows public key authentication. Please contact your network administrator.
Connection to ec2-54-214-97-39.us-west-2.compute.amazonaws.com closed by remote
host.
Connection to ec2-54-214-97-39.us-west-2.compute.amazonaws.com
closed.
I am accessing by ssh enabled command prompt:
chmod 400 virtue.pem
ssh -i "file.pem" ubuntu#ec2-publicIp.us-west-2.compute.amazonaws.com
I am unable to access aws instance vitual machine .
The error is like the one mentioned here:
https://laracasts.com/discuss/channels/servers/ssh-key-no-longer-working
You need confirm that file.pem is the correct key to access to the instances, and use chmod 400 to give permissions to the .pem in your computer. you can view the logs in the AWS console to verify if there is any message about ssh access.
You can launch other instance with other .pem or detach root volume and attach to other instance to validate the config files
This may be a problem caused by (man-in-the-middle attack).
Change your network to a private one and retry!
I was wondering how to set up filezilla or how to upload files to my ec2 server. everytime i try to set up filezilla it says:
Error: Disconnected: No supported authentication methods available (server sent: publickey)
Error: Could not connect to server
and i have to go to downloads folder and login with ssh -i key.pem user#ipaddress every time i want to have access since my mac wont automatically ssh from anywhere since i cant import it into my keychain.
According to the FileZilla Docs, it should be possible:
FileZilla supports the standard SSH agents. If your SSH agent is running, the SSH_AUTH_SOCK environment variable should be set.
Here is a documentation on how to set up ssh agent.
However I personally use Cyberduck as an SFTP client. When creating a new connection there, you can simply check "Use public key authorization" and give the path to your key file. Should be easier to set up.
you can use sshfs to fuse the ec2 instance directory to your local folder.
So, you have to do following steps :
install sshfs on your mac.
put you mac id_rsa.pub key inside authorized keys in .ssh/ folder of ec2 instance . this will allow you to mount ec2 directory to local folder. Also, this will allow you to ssh to ec2 instance without using key.pem.
mount the ec2 instance using following command :
sshfs ubuntu#ec2-xx-xx-xx-xxx.compute-1.amazonaws.com: /<your new folder location>
4. don't forget to give your folders write permissions , so that you can edit them remotely.
Hope it helps.
PuTTY fatal error:
No supported authentication methods available
When I tried to login into the production server, I am getting above error. Could anyone help me to fix this?
Edit file
sudo vi /etc/ssh/sshd_config
Set PasswordAuthentication yes
Then restart server
sudo service ssh restart
sudo service sshd restart
It worked for me after I did the following steps :
1- Download Puttygen (https://www.puttygen.com/download-putty)
2- Open PUttyGen and then Load the private key from :
C:\Users[username]\Chapter6.vagrant\machines\default\virtualbox
3- save the new private key with a new name.
4- Open Putty, go to Connection > SSH > Auth > and add the new private key
5- Connect now using 127.0.0.1 and 2222
I think your private key file format is not compatible with putty for putty uses its' native format instead.
Detail:http://tartarus.org/~simon/putty-snapshots/htmldoc/Chapter10.html#errors-no-auth
If you are using cloud service and trying to connect server using ssh then Don't login the user name as ec2-user, the default user name is ubuntu forubuntu server.
This error can also be seen if you haven’t selected the .ppk file for the session in Putty: Connection > SSH > Auth
You’re done if you’ve employed PuttyGen to generate the keys. Else import the private key to your .ppk file as others have instructed.
Note on Linux as opposed to Windows, puttygen is accessed only via the command line. Here’s some resources for that:
https://the.earth.li/~sgtatham/putty/0.76/htmldoc/Chapter8.html#pubkey
http://manpages.ubuntu.com/manpages/bionic/man1/puttygen.1.html
https://www.ssh.com/academy/ssh/putty/linux/puttygen
In my case, I updated the Putty application to the latest and issue was solved.
Do you still have access to the server (maybe an open shell?) Check /var/log/messages for more details. This could have something to do with your PAM configuration.
Did you change folder permissions? i met this question in this week, so i find the error that is cause to me change the folder(name is ec2-user) permission.
1.Edit the /etc/ssh/sshd_config file.
2.Change PasswordAuthentication and ChallengeResponseAuthentication to yes.
3a. Restart ssh /etc/init.d/ssh restart.
OR
3b. better you use service sshd restart
If you've saved your public key on an external drive and it's not connected, putty will throw this error when connecting to your remote server.
Solved via Puttygen
I was on a windows system and it doesnt support direct shell access like linux or macOS.
Download Puttygen.
Load the .pem key to puttygen
Save as Private key
Use this key to login to ec2 instance
P.S : Also if the SSH ask for login/username - enter ubuntu or admin
Download Puttygen
Load the .pem key to puttygen
convert .pem file to .ppk
Save as Private key
Install/Open Putty >> puTTY Configuration >> Auth >> Browse >> path to .ppk file
Use this key to login to ec2 instance (check that IP of remote server is allowed in security group config of EC2 instance)
Username
The usual user names are ec2-user, ubuntu, centos, root, or admin
If that server is in the cloud like AWS, the rookie mistake I did was not realizing that a new Public IPv4 DNS gets used when the instance was off for some time. So, check the new DNS
Today I faced the same problem. So in putty you have to use "user name" of your EC2 instance
to get your "user name" of your EC2 instance
Select EC2 instance
select Connect
Now go to putty use ec2_name#public address
To see your public address
select EC2
under details you will be able to see your public address.
Now try loading your "ppk" file you will be able to log in.
For Digital Ocean, we should enable password authentication first.
The complete instruction is here: https://docs.digitalocean.com/support/i-lost-the-ssh-key-for-my-droplet/#enable-password-authentication
Log in to the Droplet via the Recovery Console
Even though you have a root password for the Droplet, if you try to log in via SSH using that password immediately, you’ll receive a Permission denied (publickey) error. This is because password authentication is still disabled on the Droplet. To fix this, you need to log in via the Recovery Console and update its SSH configuration.
There are detailed instructions on how to connect to Droplets with the
Recovery Console for a more explicit walkthrough, but here’s a brief
summary:
On the Droplet’s detail page, in the same Access tab, click the Launch
Console button.
At the login prompt, enter root as the username.
At the subsequent password prompt, enter the root password you were
sent via email. Most distributions prompt you to enter the password
twice, but some (like Fedora 27) do not.
Enter a new root password to replace the one that was emailed to you,
then enter that same new password again.
You will now be logged in as root in the Recovery Console, which gives
you access to the Droplet’s SSH configuration.
Enable Password Authentication To enable password authentication on
your Droplet, you need to modify a line in its SSH config file, which
is /etc/ssh/sshd_config.
Open /etc/ssh/sshd_config using your preferred text editor, like nano
or vim. Find the line that reads PasswordAuthentication no line and
change it to PasswordAuthentication yes, then save and exit the file.
Because the SSH daemon only reads its configuration files when it’s
first starting, you need to restart it for these changes to take
effect. The command to do this depends on your operating system:
Operating System SSH Restart Command
Ubuntu 14.x service ssh restart
Ubuntu 15.4 and up systemctl restart ssh
Debian systemctl restart ssh
CentOS 6 service sshd restart
CentOS 7 systemctl restart sshd
Fedora systemctl restart sshd\
I'm setting up a "data analysis on the cloud" class and most of the students will probably be using Windows.
The students will have to set up EC2 Ubuntu instances and connect to them.
What is the easiest way to set up SSH for Windows XP-7?
I've tried PuTTY but Puttygen can only convert the public key to putty format if I manually add newlines in a text editor. This is too involved for the class of 80.
I've tried OpenSSH but I can't seem to find the correct permissions for the public key file. On Mac OS/Linux it's just chmod 600.
Is there a decent SSH client that supports Amazon's key format that I can set up easily?
The .pem file Amazon Web Services gives you is supported by the openssh client implementations, but for a Windows-based client that works directly with the .pem file without converting it with puttygen.exe, look into Bitvise Tunnelier.
If anybody's looking for windows 10 solution.
In Windows 10, you can use powershell.
Use below command.
ssh -i \..\location-to-pem-file.pem ubuntu#X.X.XXX.XXX
If ssh is not supported in your windows 10 machine, follow this url for installation.
I used it and suggested the same.
Another possible solution is to use PuTTY but follow Amazon's guide for doing so. I found some other guide's that weren't as clear in the steps but I was able to get PuTTYgen to work correctly when I used their guide.
Install PuTTY.
Follow Amazon's guide for converting your PEM file to the PuTTY PPK format.
Connect to your server!
As for newlines, maybe you need to run unix2dos or some other program that will fix that for you?
Step1: Download the keypair
The download will create a .pem file on your local system. It contains a private key that you can use to connect to the EC2 instance via SSH
Step 2: Launch your linux instance
Copy the public ip address for the future use to connect the linux instance
Step 3: Download puttyGen from https://the.earth.li/~sgtatham/putty/latest/w32/puttygen.exe
Step 4: Execute the PuttyGen exe and load the private key(the pem file you have downloaded while launching the instance)
Step 5: Save the private key, it will give the .ppk file which will be used to connect the linux instance
Step 6: Download and install the Putty software, open the putty, and paste the public ip address which you copied from the linux instance
Step 7: Now load the .PPK file which we have saved
Step 8: Choose yes from the alert window
Step 9: Login as ec-user
I borrowed the method giving in this video. https://youtu.be/P1erVo5X3Bs
Open power shell and run below commands. You can open power shell at any location by print powershell in the nevigation bar and press enter.
enter image description here
1.reset premission:
icals.exe key.pem /reset
2.check the current user id
whoami
3.add permision to specific user id
icacls.exe key.pem /grant:r "YOUR USER ID GIVEN BY WHOAMI"
4.remove permission of other user
icacls.exe .\ec2.pem /inheritance:r
Now it should work.
If anybody's looking for windows 10 solution.
icacls.exe .\Desktop\xxxx.pem /reset
icacls.exe .\Desktop\xxxx.pem /grant:r "$($env:USERNAME):(r)"
icacls.exe .\Desktop\xxxx.pem /inheritance:r
ssh -i .\Desktop\xxxx.pem ec2-user#54.229.xxx.x