Capistrano SSH::AuthenticationFailed, not prompting for password

I've been using capistrano successfully for a while now and all of a sudden in every project I've lost the ability to deploy.

Environment:

• os X (Mavericks)
• ruby 1.9.3p194
• rvm (locally, not on server)
• rails 3.2 and up
• RubyGems 1.8.25

I'm not using rsa_keys or anything I want capistrano to prompt for user and password. Suddenly it has decided not to ask for a password, but does ask for user. Then it rolls back and gives me the following error.

[deploy:update_code] exception while rolling back: Capistrano::ConnectionError, connection failed for: sub.example.com (Net::SSH::AuthenticationFailed: Authentication failed for user user@sub.example.com)
connection failed for: sub.example.com (Net::SSH::AuthenticationFailed: Authentication failed for user user@sub.example.com)

This has occurred on my personal laptop and my iMac at work. It occurs when deploying to two different servers (both linux)

I'm completely at a loss here. Any ideas?

Figured it out! Apparently this issue was with net-ssh gem. I had version 2.8.0 installed recently with some updates to my development environment and was the cause.

I'm not sure why it was failing, but gem uninstall net-ssh -v 2.8.0< fixed it for me.

If anyone actually knows why this was an issue or how I can correct this issue with the newer version of net-ssh I'd be interested to hear it.

The answer may break your rails app due to gem dependancies.

The issue is with net-ssh as was correctly answered by Sparkmasterflex, however whilst this will get capistrano working ok it may break your rails app:

These steps fixed both capistrano and rails for me ...

1. In your Gemfile add gem 'net-ssh', '2.7.0'
2. Run bundle update net-ssh
3. Run bundle (just to be sure everything is working ok'
4. Run gem uninstall net-ssh -v 2.8.0

If you are a rails user you should now be able to run both the rails server and capistrano.

I have a workaround that doesn't require downgrading net-ssh, per a comment at the link that Zach Lipton posted. Place this code in config/deploy.rb:

set :ssh_options, {
  config: false
  #Other options...
}

After I did that, I got another error, Error reading response length from authentication socket. Found the solution to that here. Execute these commands at your Bash prompt:

$ eval $(ssh-agent)
$ ssh-add

Upgrading your net-ssh version to 2.8.1 will solve the problem. They released a version bump in 19th february 2014 that fix this and other problems.

1. Uninstall your current net-ssh gem (gem install net-ssh -v 'version')

2. Just paste this on your Gemfile:

   gem 'net-ssh', '~> 2.8.1', :git => "https://github.com/net-ssh/net-ssh"

3. Run bundle install

I had the same problem while deploying using capistrano Net::SSH::AuthenticationFailed: Authentication failed for user deployer@IP

ssh-copy-id deployer@ip

This will add your keys to server and you can login without password.

set :ssh_options, {
 verbose: :debug
}

... helps a lot!

I had an issue that I generated my public and private keys with puttygen and exported private key as OpenSSH with name <somename>.id_rsa. An then saved public key with name <somename>.id_rsa.pub.

( ! ) The public key puttygen saves is in RFC 4716 format not PEM. Use public suffix instead of pub for public key file-

This snippet works for me:

group :development do
  #.....
  gem 'capistrano', "~> 2.15"
  gem "net-ssh", "~> 2.7.0"
  #.....
end

First try to connect to your server with certificate (file.pem) with this command:

ssh -i "file.pem" user@yourServerIp

Then try to run cap production deploy. It solved error for me. I think it is because time limit for certificate expired.

If all the above solutions doesn't work,please restart your system as you might be facing the issue due to net-ssh host connections.when you restart and enter the deployment command ,it will ask to add the identity to known hosts.