after trying many combinations of domain and user, I guess the current Powershell plugin is not able to user domain users. When checking the Windows security eventlog I can see many failed logons. The plugin uses the domain\user combination as user and the Powershell host name as domain.
This results in the following access credentials:
Local users worked fine for me. Did someone successfully use a domain account or is this behaviour just a bug of the Powershell plugin?
The first version of the plugin supports only basic authentication and not with domain credentials.
Update is prepared that will include also support for Kerberos authentication wich will allow usage of domain accounts.
Check out also following message.