Windows Remote Management (WinRM) for Ruby

Build Status Gem Version

This is a SOAP library that uses the functionality in Windows Remote Management(WinRM) to call native object in Windows. This includes, but is not limitted to, running batch scripts, powershell scripts and fetching WMI variables. For more information on WinRM, please visit Microsoft's WinRM site:


gem install -r winrm then on the server winrm quickconfig as admin


require 'winrm'
endpoint = 'http://mywinrmhost:5985/wsman'
krb5_realm = 'EXAMPLE.COM'
winrm =, :kerberos, :realm => krb5_realm)
winrm.cmd('ipconfig /all') do |stdout, stderr|
  STDOUT.print stdout
  STDERR.print stderr

There are various connection types you can specify upon initialization:

It is recommended that you :disable_sspi => true if you are using the plaintext or ssl transport.

Plaintext, :plaintext, :user => myuser, :pass => mypass, :disable_sspi => true)

## Same but force basic authentication:, :plaintext, :user => myuser, :pass => mypass, :basic_auth_only => true)

SSL, :ssl, :user => myuser, :pass => mypass, :disable_sspi => true)

# Specifying CA path, :ssl, :user => myuser, :pass => mypass, :ca_trust_path => '/etc/ssl/certs/cert.pem', :basic_auth_only => true)

# Same but force basic authentication:, :ssl, :user => myuser, :pass => mypass, :basic_auth_only => true)

# Basic auth over SSL w/self signed cert
# Enabling no_ssl_peer_verification is not recommended. HTTPS connections are still encrypted,
# but the WinRM gem is not able to detect forged replies or man in the middle attacks., :ssl, :user => myuser, :pass => mypass, :basic_auth_only => true, :no_ssl_peer_verification => true)
Create a self signed cert for WinRM

You may want to create a self signed certificate for servicing https WinRM connections. First you must install makecert.exe from the Windows SDK, then you can use the following PowerShell script to create a cert and enable the WinRM HTTPS listener.

$hostname = $Env:ComputerName

C:\"Program Files"\"Microsoft SDKs"\Windows\v7.1\Bin\makecert.exe -r -pe -n "CN=$hostname,O=vagrant" -eku -ss my -sr localMachine -sky exchange -sp "Microsoft RSA SChannel Cryptographic Provider" -sy 12 "$hostname.cer"

$thumbprint = (& ls cert:LocalMachine/my).Thumbprint
$cmd = "winrm create winrm/config/Listener?Address=*+Transport=HTTPS '@{Hostname=`"$hostname`";CertificateThumbprint=`"$thumbprint`"}'"
iex $cmd

Kerberos, :kerberos, :realm => 'MYREALM.COM')


You may have some errors like WinRM::WinRMHTTPTransportError: Bad HTTP response returned from server (401).. You can run the following commands on the server to try to solve the problem: winrm set winrm/config/client/auth @{Basic="true"} winrm set winrm/config/service/auth @{Basic="true"} winrm set winrm/config/service @{AllowUnencrypted="true"} You can read more about that on issue #29

Current features

  1. GSSAPI support: This is the default way that Windows authenticates and secures WinRM messages. In order for this to work the computer you are connecting to must be a part of an Active Directory domain and you must have local credentials via kinit. GSSAPI support is dependent on the gssapi gem which only supports the MIT Kerberos libraries at this time.

If you are using this method there is no longer a need to change the WinRM service authentication settings. You can simply do a 'winrm quickconfig' on your server or enable WinRM via group policy and everything should be working.

  1. Multi-Instance support: The SOAP back-end has been completely gutted and is now using some of the Savon core libraries for parsing and building packets. Moving away from Handsoap allows multiple instances to be created because the SOAP backend is no longer a Singleton type class.


  1. Fork it.
  2. Create a branch (git checkout -b my_feature_branch)
  3. Run the unit and integration tests (bundle exec rake integration)
  4. Commit your changes (git commit -am "Added a sweet feature")
  5. Push to the branch (git push origin my_feature_branch)
  6. Create a pull requst from your branch into master (Please be sure to provide enough detail for us to cipher what this change is doing)

Running the tests

We use Bundler to manage dependencies during development.

$ bundle install

Once you have the dependencies, you can run the unit tests with rake:

$ bundle exec rake spec

To run the integration tests you will need a Windows box with the WinRM service properly configured. Its easiest to use a Vagrant Windows box.

  1. Create a Windows VM with WinRM configured (see above).
  2. Copy the config-example.yml to config.yml - edit this file with your WinRM connection details.
  3. Run bundle exec rake integration

My Info


Many thanks to the following for their many patches.... * Seth Chisamore ( * Paul Morton (


If you see something that could be done better or would like to help out in the development of this code please feel free to clone the repository and send me patches.

git clone git:// or add an issue on GitHub