I am trying to set up a Jenkins with Windows on-demand slaves.

The Windows EC2-Instances are started by the plugin, but the WinRM connection cannot be established. The logs are stuck in a "Waiting for WinRM to come up"-loop.

But I can create a WinRM-connection to the instances manually using a python library. When I compare both (the connection attempt by the EC2-Plugin and the connection by the lython tool) I observe the following:

• the POST-request to /wsman is answered with a 401 by the Windows instance
• this seems to be the case because the Authorization header is completely missing in the request

Is this a bug in the plugin or am I doing something wrong?