New to Amazon AWS here. I setup a new ubuntu instance but cannot SSH to the instance. How do I find the login/password for SSH? I don't remember one being shared with me when I created that instance.
I added my IP to inbound traffic for the security group
I setup a key and am using the key with my Putty connection
I am able to get to the login step, but when I enter 'root' as the login (or any value), I get:
Server refused our key
Disconnected: No supported authentication methods available (server send: publickey)
when you deploy an EC2 instance in AWS, you'll be asked to select existing key-pair or create new one. if you choose to create new one, AWS will give you the keypair.
after new key-pair is downloaded, you need to change the key permission.
If you deploy an Ubuntu instance, the user usually ubuntu.
ssh -i key.pem ubuntu#yourinstanceIP
or you can select the instance, and you can click on Connect button.
Related
I create ec2-instance on the AWS server:
Now I try to connect to the server with putty.
First of all, I downloaded the PPK for instance:
In the next I created a connection with putty:
After I launch connection and set the username as ec2-user:
in the result I got the error:
How to correctly connect to the ec2 instance with PPK?
What I understand from the question is that you did launch an EC2 instance successfully and afterwards you generated a new SSH key pair which does not have any connection to the already created EC2 instance.
What you should have done is to create a new key when the instance was launched:
OR select an existing key:
Now, the easiest way to solve this problem is to terminate the EC2 instance and recreate it with your existing key pair. You should be able to chose wlifter-ppk from the dropdown.
If, for some reason, you don't want to do this or it is not possible to terminate and relaunch the instance, there are several ways to rescue the instance and attach an existing SSH key.
I. Manually rescue the instance:
From Putty convert you .ppk to RSA public key.
Use EC2 Instance Connect or Session Manager to connect to your instance.
Locate the .ssh/authorized_keys file. For Amazon Linux instances this can be found in /home/ec2-user/.ssh folder.
Open authorized_keys, append the new RSA public key and save the file.
Connect to the instance using Putty.
II. Use EC2Rescue tool https://aws.amazon.com/premiumsupport/knowledge-center/ec2-instance-boot-issues/
I assume you have local Windows and you'd like to connect to your EC2 AWS linux VM.
Use PuTTYgen to generate SSH-2 RSA key, 2048 bits.
Save keys into file, ie. myaws1.pub and myaws1.
In AWS dashboard, find your live instance, open up shell. It'll open up in the browser.
You will be logged in most likely as ec2-user
vi .ssh/authorized_keys
On your Windows, open up myaws1.pub file. take the relevant part and make it one line. Yes, it's broken up into multiple lines. Now press CTRL-C. And over in the browser where you Linux shell, press ESC-I (for insert), now CTRL-V (paste). Save and exit vi.
Back to Amazon Dashboard, in Network Security -> Security Groups, create SSH inbound rule with source 0.0.0.0/0
Now, when connecting to your instance from Putty use "Auth" in options.
This is what your new line in auth file should look like. I shortened it
ssh-rsa AAAAB3......... aws1
I am trying to connect to an EC2 instance with the key. But I get an error saying
No supported authentication methods available (the server sent: public key")
In the command window I get:
Using username "ec2-user"
Server refused our key
. Please help me
I will try to help! Suppose you are trying to connect using the PuTTY SSH client on your local machine. (Connecting with an FTP client like WinSCP is very similar).
Short answer: You need to let PuTTY know your ec2user IP address and associate the private key of the EC2 instance with the PuTTY session. On the AWS side you need to create a security group that allows inbound access from your IP address to your EC2 instance for SSH on port 22.
__
Long answer 😊:
Go to your EC2 page and click [CONNECT]
[]1
Copy the ec2User IP address to PuTTY.
When you created the EC2 instance, you were prompted to download the public/private key pair. You need that private key. If you don’t have that file, things are more complicated. (See Change key pair for ec2 instance).
But hopefully, you can find the private PuTTY Private Key file downloaded on your local machine:
Save the session. PuTTY should be all set up now.
Now on the AWS side, you need to make a new security Group:
Create the group and ADD an Inbound Rule:
Go back to EC2 and add security group to EC2.
In the dialog that pops up, check the security group that you just created for PuTTY remote access and click [Assign Security Groups]
Now give it a try!
I hope this works for you like it does for me.
ONE FINAL TIP: Make sure that you associate an Elastic IP address to the instance. Otherwise, this connection might stop working when someday you reboot your EC2. The elastic IP pins it down.
Verify that you are connecting with the appropriate user name for your AMI. Type the user name in User name in the PuTTY Configuration window.
The appropriate user names are as follows:
For Amazon Linux 2 or the Amazon Linux AMI, the user name is ec2-user.
For a CentOS AMI, the user name is centos.
For a Debian AMI, the user name is admin or root.
For a Fedora AMI, the user name is ec2-user or fedora.
For a RHEL AMI, the user name is ec2-user or root.
For a SUSE AMI, the user name is ec2-user or root.
For an Ubuntu AMI, the user name is ubuntu.
Otherwise, if ec2-user and root don't work, check with the AMI provider.
You should also verify that your private key (.pem) file has been correctly converted to the format recognized by PuTTY (.ppk).
I got problem. I did opened server from the AWS EC2 AMAZON. Its gived me .pem file. With putty key generator i did changed it to .ppk file. I want to connect my server without .ppk or .pem or any like that file. How can i remove this security check point? Thanks.
Best Regards.
You need to authenticate using the private ssh key when you connect to an EC2 instance. If you don't want to do that, then there are two choices
Recommended : To use new AWS web console ssh connection to your EC2 instance
This is quite a new feature introduced by AWS to ssh into you EC2 instance from the web browser. In your EC2 view, select the instance and click on the Connect button
Not recommended Using password based authentication for a new user.
I wouldn't be providing details on this one as it is not secured to use password based authentication and your should ideally be using the ssh keys based auth.
I am using mac terminal and I want to connect my machine with server instance EC2 in aws with SSH. Since I am using Mac OS X is not necessary to use PUTTY. The problem is that when I download the key it is with extension .ppk but when i need to run it on terminal i need to use a command in which i have to use .pem extension . I tried to run it in that way and it said to me permission denied. Can someone help me what to do in this case? Do i have to change the permission or to convert my key from .ppk to .ppm?
You need to know the .pem file folder you download, and then follow steps below:
download the keypair(.pem file)
cd to keypair(.pem file) location (Note that you can use absolute path name for key pair instead)
chmod 400 [your_key_name].pem (Note that to make SSH work, your key must not be publicly viewable. Use this command if needed.)
ssh -i "[your_key_name].pem" ec2-user#[your ec2 dns name]
You will have to convert your "ppk" file to "pem" file follow this steps.
http://www.ramsmusings.com/2014/02/20/converting-a-putty-ppk-file-to-a-pem-file-for-accessing-aws-ec2-instances/
After you convert connect to the instance using the SSH command and converted "pem" file.
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AccessingInstancesLinux.html
Quick answer
Instead of working directly with SSH keys I would consider working with AWS ec2-instance-connect.
It saves you the the management of the SSH keys and is much safer then sharing SSH keys for each EC2 machine between team members.
After authentication with the aws credentials (by referring to a profile in .aws/config file or using environment variables ) you can connect to the instance very easily by providing the instance ID:
./bin/mssh <instance-ID>
Installation of this tool can be done via pip or directly from the github repo.
Additional information
Amazon EC2 Instance Connect provides a simple and secure way to connect to your instances using Secure Shell (SSH).
With EC2 Instance Connect, you use AWS Identity and Access Management (IAM) policies and principles to control SSH access to your instances, removing the need to share and manage SSH keys.
When you connect to an instance using EC2 Instance Connect, the Instance Connect API pushes a one-time-use SSH public key to the instance metadata where it remains for 60 seconds. An IAM policy attached to your IAM user authorizes your IAM user to push the public key to the instance metadata.
The SSH daemon uses AuthorizedKeysCommand and AuthorizedKeysCommandUser, which are configured when Instance Connect is installed, to look up the public key from the instance metadata for authentication, and connects you to the instance.
You can use Instance Connect to connect to your Linux instances using a
browser-based client,
the Amazon EC2 Instance Connect CLI,
or the SSH client of your choice.
(*) Amazon Linux 2 2.0.20190618 or later and Ubuntu 20.04 or later comes preconfigured with EC2 Instance Connect.
For other supported Linux distributions, you must set up Instance Connect for every instance that will support using Instance Connect. This is a one-time requirement for each instance.
Links:
Connect using EC2 Instance Connect
Securing your bastion hosts with Amazon EC2 Instance Connect
I have a working m3.large instance on Amazon AWS that I'm able to login to using a username and a password via ssh. I've cloned it by creating an AMI of it and then spinning up another m3.large instance based on that AMI, but I cannot ssh into it. In putty, after typing in my username, I get "Server refused our key"
followed by Disconnected: No supported authentication methods available (server sent: publickey). Shouldn't the new cloned instance behave exactly like the one the AMI came from? Shouldn't the only difference be their IP addresses?
Ok i figured out that the problem was in the original instance, the one I'd cloned. In its /etc/ssh/sshd_config, i'd neglected to include the line PasswordAuthentication yes For some reason even with it set to no I could login on the original instance, but not on the clone.