So a single point of reference for generating SSH keys is Generating SSH Keys for SFTP Adapters – Type 1 – Process Integration – SCN Wiki.
- Ssh-3-keypair Attempt To Generate Server Keys Failed Download
- Ssh-3-keypair Attempt To Generate Server Keys Failed To Build
- Ssh-3-keypair Attempt To Generate Server Keys Failed To Start
- Ssh-3-keypair Attempt To Generate Server Keys Failed Windows 10
- Ssh-3-keypair Attempt To Generate Server Keys Failed To Change
- SSH Public Key Subsystem. Recent Bitvise SSH Server and SSH Client versions support the SSH Public Key Subsystem. To import a public key into the SSH Server this way: Use the SSH Client to connect to the SSH Server using the account for which you want to configure the public key. Once connected, open Client key manager. Right-click on the keypair, and select Upload to server.
- Jun 26, 2019 From the My Profile page, select the SSH Keys tab, and then click Add a SSH Key: Create a label for your key, then paste in the contents of your public SSH key (idrsa.pub): Click Add Key. When you next create a Linode you’ll be given the opportunity to include your SSH key in the Linode’s creation.
Failed to generate a user instance of SQL Server due to a failure in starting the process for the user instance. The connection will be closed. The Connection string is. Oct 20, 2014 SSH key pairs are two cryptographically secure keys that can be used to authenticate a client to an SSH server. Each key pair consists of a public key and a private key. The private key is retained by the client and should be kept absolutely secret. I am running on a RHEL 6 operating system. I can see failed login attempt (password failures) in my /var/log/secure file. However, I don't see attempts to ssh to the server when the key is not correct. For example, if I issue the ssh request: ssh -o BatchMode=yes -i./idrsa [email protected] It comes back with.
Recent observations from multiple projects where people create SSH public key and give to SFTP server team and mysteriously it connect then. It all left me searching here and there solve the problem. The causes of this are –
1. SAP PI Developer not aware whether keys are valid or not?
2. SFTP server administrator may just believe key provided are correct?
3. Basis team may not may also be unaware how the end ssh key should be? Is it uploaded at the correct place? Are the permissions correct.
So here I am, making an attempt to bridge the gap and provide you the “KEY for Key Generation”. Let us first know what all we may need, the so called –
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PRE-REQUISITES
1. WinScp (you may have other tools, but this one is simple and easily available 🙂 )
2. Cygwin installed with openSSH and openSSL packages
Video – https://www.youtube.com/watch?v=hh-V6el8Oxk
              Text – Installing Cygwin/X
3. Putty (FAMOUS) – this and WinScp can be combined.
4. NWA keystore access to create keystores
The above is enough to generate the keys and have it ready for the development. But, we PI consultants end up getting erroneous results for a new configuration. So to make sure we give the tested keys to client here is a tutorial to create the SFTP server on your local windows machine.
Apart from the links in the Part2, I will explain hand-picked steps out of the tutorial to set up sftp server correctly and quickly in the first attempt ( 😉 ) . So enough of reading let us start with the configuration.
1. Start Winscp -> Click on Tools -> Run PuTTygen
![Failed Failed](/uploads/1/2/6/0/126049444/725584535.jpg)
2. Select Parameters – SSH-2 RSA and Enter number of bits -2048. Click Generate.
3. Now you need to save the PrivateKey (ppk), PublicKey and PublicKey to be saved in SFTP server.
Note- i) The public key saved from “Save Public Key” and the “Public Key” to be saved in SFTP server can’t be same. The public key                                        saved starts with —- BEGIN SSH2 PUBLIC KEY —-, but the key to be pasted in SFTP server starts with ssh-rsa.
 ii) In the file authorized_keys, each line refers to a separate public key. So we also need to make sure there are no new line                                              characters in our key. So an authorized_keys file will look as below-
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4. Below are the Keys generated. Please follow the instruction in screenshots carefully.
Once the keys are generated, click on Save Private Key, Save Public Key and copy paste the key to be pasted in authorized_keys file and save.
Now, you will have 3 files generated. PPK private key, SSH public Key, SSH Public key to be pasted on to SFTP server. I have named 3 files as privateKey_SFTP.ppk, publicKey_SFTP.pub and publicKey_SSH.pub. Files will look as below.
5.Now sendpublicKey_SSH.pub file to SFTP server team to install via mail. If you want to test it with a local SFTP server, refer part 2 or video link embedded above.
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6. Before we put the key to SAP PO NWA KeyStore we must make sure our keys are set up correctly. To test this we can use WinScp or PuTTy.
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Testing With WinScp
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Ssh-3-keypair Attempt To Generate Server Keys Failed Download
In Advanced->Click Authentication under SSH -> Select the ppk private key
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When you login for the first time, you will get a warning with the server’s fingerprint. This is a good sign showing it is able to reach the SFTP server. Just click Yes.
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If you have chosen Passphrase while generating the key it will ask the passphrase else it will connect.
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And that is it, you will be placed at the SFTProot folder.
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This must be your Hurray! moment. After this the task is easy. We need to convert PPK to PKCS12 and import in NWA. Lets see how to do that too.
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6. Now we need to convert privateKey_SFTP.ppk to pkcs12 format for SAP PO to import in NWA key store. For this Cygwin must be installed with openssl package
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  i) We will generate a PEM private key. I am naming it as privateKey_SFTP.pem. So again launch WinSCP->Tools->Run PuttYgen
  ii) Click on File->Load Private Key and choose your PPK key (privateKey_SFTP.ppk)
![Ssh-3-keypair Attempt To Generate Server Keys Failed Ssh-3-keypair Attempt To Generate Server Keys Failed](/uploads/1/2/6/0/126049444/343849494.jpg)
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      iii) Once the key is loaded, I recommend remove the passphrase this time and click Conversions->Export Open SSH Key, it will give warnign for blank passphrase. Just click YES and proceed. Name it as <yourname>.pem (privateKey_SFTP.pem)
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It will look like
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    iv) Now launch cygwin as administrator . Right click -> run as administrator. Now run change directory ( cd) command to move to directory where you kept you pem file. for the ease place it in any drve G: , D: . This will save us to struggle with CD command 😉
v) use OpenSSL package commands to create X.509 certificate
    openssl req -
new
-x509 -days
3650
-key privateKey_SFTP.pem -out x509_certificateSFTP.pem
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                v) Now we will create PKCS 12 key to be imported in NWA with a password. Continuing in the CYGWIN enter following command
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            openssl pkcs12 -export -in x509_certificateSFTP.pem -inkey privateKey_SFTP.pem -out sftp_keystore.p12
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7. Now login to NWA of SAP PO/PI . http://<host>:<port>/nwa…… Configuration->Certificates and keys Office 2010 home and business product key generator.
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      i) Click on Add View-> Give View Name
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       ii) choose SFTP_KeyStore -> Import Entry-> PKCS#12 and click choose file to select the p12 generated. Provide the password which we set in cygwin while generating P12 and click import
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This is all. Now you can select the above private key in your SFTP channel and continue with your development.
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In the Part 2, I will show how to test the connection with PuTTy (already shown with WinScp) and also how to set up the local SFTP server. Stay Tuned for Part2
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Password authentication is the default method most SSH (Secure Shell) clients use to authenticate with remote servers, but it suffers from potential security vulnerabilities, like brute-force login attempts. An alternative to password authentication is public key authentication, in which you generate and store on your computer a pair of cryptographic keys and then configure your server to recognize and accept your keys. Using key-based authentication offers a range of benefits:
- Key-based login is not a major target for brute-force hacking attacks.
- If a server that uses SSH keys is compromised by a hacker, no authorization credentials are at risk of being exposed.
- Because a password isn’t required at login, you are able to able to log in to servers from within scripts or automation tools that you need to run unattended. For example, you can set up periodic updates for your servers with a configuration management tool like Ansible, and you can run those updates without having to be physically present.
This guide will explain how the SSH key login scheme works, how to generate an SSH key, and how to use those keys with your Linode.
NoteIf you’re unfamiliar with SSH connections, review the Getting Started with Linode guide.
How SSH Keys Work
SSH keys are generated in pairs and stored in plain-text files. The key pair (or keypair) consists of two parts:
- A private key, usually named
id_rsa
. The private key is stored on your local computer and should be kept secure, with permissions set so that no other users on your computer can read the file.Caution
- A public key, usually named
id_rsa.pub
. The public key is placed on the server you intend to log in to. You can freely share your public key with others. If someone else adds your public key to their server, you will be able to log in to that server.
When a site or service asks for your SSH key, they are referring to your SSH public key (
id_rsa.pub
). For instance, services like GitHub and Gitlab allow you to place your SSH public key on their servers to streamline the process of pushing code changes to remote repositories.The authorized_keys File
In order for your Linode to recognize and accept your key pair, you will need to upload your public key to your server. More specifically, you will need to upload your public key to the home directory of the user you would like to log in as. If you would like to log in to more than one user on the server using your key pair, you will need to add your public key to each of those users.
Ssh-3-keypair Attempt To Generate Server Keys Failed To Build
To set up SSH key authentication for one of your server’s users, add your public key to a new line inside the user’s
authorized_keys
file. This file is stored inside a directory named .ssh/
under the user’s home folder. A user’s authorized_keys
file can store more than one public key, and each public key is listed on its own line. If your file contains more than one public key, then the owner of each key listed will be able to log in as that user.Granting Someone Else Access to your Server
To give someone else access to your server’s user, simply add their public key on a new line in your
authorized_keys
file, just as you would add your own. To revoke access for that person, remove that same line and save the changes.Challenge-Response
When logging in to a server using SSH, if there is a public key on file on that server, the server will create a challenge. This challenge will be crafted in such a way that only the holder of the private SSH key will be able to decipher it.
This challenge-response action happens without any user interaction. If the person attempting to log in has the corresponding private key, then they will be safely logged in. If not, the login will either fail or fall back to a password-based authentication scheme.
SSH Key Passphrases
You can optionally provide an additional level of security for your SSH keys by encrypting them with a passphrase at the time of creation. When you attempt to log in using an encrypted SSH key, you will be prompted to enter its passphrase. This is not to be confused with a password, as this passphrase only decrypts the key file locally and is not transferred over the Internet as a password might be.
If you’d like to set up your logins so that they require no user input, then creating a passphrase might not be desirable, but it is strongly recommended nevertheless.
Linux and macOS
Generate a Key Pair
Perform the steps in this section on your local machine.
- Create a new key pair.
Caution
This command will overwrite an existing RSA key pair, potentially locking you out of other systems.It is useful, for example, for someone who owns multiple copies of the game. Now supports counter-strike retail!Editors Note: This is NOT a key generator, but simply a way to change your product key. This is convenient when you have been banned from a certain server or want your statistics under a different player name.Please note we welcome all comments and believe in free speech, but we do have some baic ground rules.If you’ve already created a key pair, skip this step. To check for existing keys, runls ~/.ssh/id_rsa*
.If you accidentally lock yourself out of the SSH service on your Linode, you can still use the Lish console to login to your server. After you’ve logged in via Lish, update yourauthorized_keys
file to use your new public key. This should re-establish normal SSH access.The-b
flag instructsssh-keygen
to increase the number of bits used to generate the key pair, and is suggested for additional security. - Press Enter to use the default names
id_rsa
andid_rsa.pub
in the/home/your_username/.ssh
directory before entering your passphrase. - While creating the key pair, you will be given the option to encrypt the private key with a passphrase. This means that the key pair cannot be used without entering the passphrase (unless you save that passphrase to your local machine’s keychain manager). We suggest that you use the key pair with a passphrase, but you can leave this field blank if you don’t want to use one.
Upload your Public Key
Ssh-3-keypair Attempt To Generate Server Keys Failed To Start
There are a few different ways to upload your public key to your Linode from Linux and macOS client systems:
Using ssh-copy-id
ssh-copy-id
is a utility available on some operating systems that can copy a SSH public key to a remote server over SSH.- To use
ssh-copy-id
, pass your username and the IP address of the server you would like to access: - You’ll see output like the following, and a prompt to enter your user’s password:
- Verify that you can log in to the server with your key.
Using Secure Copy (scp)
Secure Copy (
Cautionscp
) is a tool that copies files from a local computer to a remote server over SSH:These instructions will overwrite any existing contents of the
authorized_keys
file on your server. If you have already set up other public keys on your server, use the ssh-copy-id
command or enter your key manually.- Connect to your server via SSH with the user you would like to add your key to:
- Create the
~/.ssh
directory andauthorized_keys
file if they don’t already exist: - Give the
~/.ssh
directory andauthorized_keys
files appropriate file permissions: - In another terminal on your local machine, use
scp
to copy the contents of your SSH public key (id_rsa.pub
) into theauthorized_keys
file on your server. Substitute in your own username and your server’s IP address: - Verify that you can log in to the server with your key.
Manually Copy an SSH Key
You can also manually add an SSH key to a server:
- Begin by copying the contents of your public SSH key on your local computer. You can use the following command to output the contents of the file:You should see output similar to the following:Note that the public key begins with
ssh-rsa
and ends with[email protected]
. - Once you have copied that text, connect to your server via SSH with the user you would like to add your key to:
- Create the
~/.ssh
directory andauthorized_keys
file if they don’t already exist: - Give the
~/.ssh
directory andauthorized_keys
files appropriate file permissions: - Open the
authorized_keys
file with the text editor of your choice (nano
, for example). Then, paste the contents of your public key that you copied in step one on a new line at the end of the file. - Save and close the file.
Note
If you initially logged into the server asroot
but edited theauthorized_keys
file of another user, then the.ssh/
folder andauthorized_keys
file of that user may be owned byroot
. Set that other user as the files’ owner: - Verify that you can log in to the server with your key.
Connect to the Remote Server
- SSH into the server from your local machine:
- If you chose to use a passphrase when creating your SSH key, you will be prompted to enter it when you attempt to log in. Depending on your desktop environment, a window may appear:
Caution
Do not allow the local machine to remember the passphrase in its keychain unless you are on a private computer which you trust.You may also see the passphrase prompt at your command line: - Enter your password. You should see the connection establish in the local terminal.
Windows
The following instructions use the PuTTY software to connect over SSH, but other options are available on Windows too.
Generate a Key Pair with PuTTY
- Download PuTTYgen (
puttygen.exe
) and PuTTY (putty.exe
) from the official site. - Launch
puttygen.exe
. TheRSA
key type at the bottom of the window is selected by default for an RSA key pair butED25519
(EdDSA using Curve25519) is a comparable option if your remote machine’s SSH server supports DSA signatures. Do not use theSSH-1(RSA)
key type unless you know what you’re doing. - Increase the RSA key size from
2048
bits4096
and click Generate: - PuTTY uses the random input from your mouse to generate a unique key. Once key generation begins, keep moving your mouse until the progress bar is filled:
- When finished, PuTTY will display the new public key. Right-click on it and select Select All, then copy the public key into a Notepad file.
- Save the public key as a
.txt
file or some other plaintext format. This is important–a rich text format such as.rtf
or.doc
can add extra formatting characters and then your private key won’t work: - Enter a passphrase for the private key in the Key passphrase and Confirm passphrase text fields. Important: Make a note of your passphrase, you’ll need it later:
- Click Save private key. Choose a file name and location in Explorer while keeping the
ppk
file extension. If you plan to create multiple key pairs for different servers, be sure to give them different names so that you don’t overwrite old keys with new:
Manually Copy the SSH Key with PuTTY
- Launch
putty.exe
. Find the Connection tree in the Category window, expand SSH and select Auth. Click Browse and navigate to the private key you created above: - Scroll back to the top of the Category window and click Session. Enter the hostname or IP address of your Linode. PuTTY’s default TCP port is
22
, the IANA assigned port for for SSH traffic. Change it if your server is listening on a different port. Name the session in the Saved Sessions text bar and click Save: - Click the Open button to establish a connection. You will be prompted to enter a login name and password for the remote server.
- Once you’re logged in to the remote server, configure it to authenticate with your SSH key pair instead of a user’s password. Create an
.ssh
directory in your home directory on your Linode, create a blankauthorized_keys
file inside, and set their access permissions: - Open the
authorized_keys
file with the text editor of your choice (nano
, for example). Then, paste the contents of your public key that you copied in step one on a new line at the end of the file. - Save, close the file, and exit PuTTY.
- Verify that you can log in to the server with your key.
Using WinSCP
Uploading a public key from Windows can also be done using WinSCP:
CautionThese instructions will overwrite any existing contents of the
authorized_keys
file on your server. If you have already set up other public keys on your server, use the PuTTY instructions instead.- In the login window, enter your Linode’s public IP address as the hostname, the user you would like to add your key to, and your user’s password. Click Login to connect.
- Once connected, WinSCP will show two file tree sections. The left shows files on your local computer and the right shows files on your Linode. Using the file explorer on the left, navigate to the file where you saved your public key in Windows. Select the public key file and click Upload in the toolbar above.
- You’ll be prompted to enter a path on your Linode where you want to upload the file. Upload the file to
/home/your_username/.ssh/authorized_keys
. - Verify that you can log in to the server with your key.
Connect to the Remote Server with PuTTY
Start PuTTY and Load your saved session. You’ll be prompted to enter your server user’s login name as before. However, this time you will be prompted for your private SSH key’s passphrase rather than the password for your server’s user. Enter the passphrase and press Enter.
Troubleshooting
If your SSH connections are not working as expected, or if you have locked yourself out of your system, review the Troubleshooting SSH guide for troubleshooting help.
Upload your SSH Key to the Cloud Manager
It is possible to provision each new Linode you create with an SSH public key automatically through the Cloud Manager.
- Log in to the Cloud Manager.
- Click on your username at the top right hand side of the page. Then click on My Profile in the dropdown menu that appears:
Note
If you are viewing the Cloud Manager in a smaller browser window or on a smaller device, then the My Profile link will appear in the sidebar links. To view the sidebar links, click on the disclosure button to the left of the blue Create button at the top of the page. - From the My Profile page, select the SSH Keys tab, and then click Add a SSH Key:
- Create a label for your key, then paste in the contents of your public SSH key (
id_rsa.pub
): - Click Add Key.
- When you next create a Linode you’ll be given the opportunity to include your SSH key in the Linode’s creation. This key will be added to the root user of the new Linode.In the Create Linode form, select the SSH key you’d like to include. This field will appear below the Root Password field:
Next Steps
After you set up your SSH keys and confirm they are working as expected, review the How to Secure Your Server guide for instructions on disabling password authentication for your server.
Ssh-3-keypair Attempt To Generate Server Keys Failed Windows 10
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