How to allow access to winrs for non-admin user?

Question

I have Windows Server 2012 (and Server 2008, but it is next priority) to monitor it using txwinrm. txwinrm library internally is using WinRS protocol. I have to monitor it using least privileged user, but don't know how to configure access for him.
All I managed to do - is to configure remote Powershell session for my user, but it's look like that winrs and powershell sessions have different security descriptors:
Invoke-Command -ComputerName 192.168.173.206 -Credential (credential Administrator $pwd) -ScriptBlock { 2 + 2}
# gives 4
Invoke-Command -ComputerName 192.168.173.206 -Credential (credential lpu1 $pwd) -ScriptBlock { 2 + 2}
# gives 4
winrs -r:192.168.173.206 -u:Administrator -p:$pwd 'powershell -command "2+2"'
# gives 4
winrs -r:192.168.173.206 -u:lpu1 -p:$pwd 'powershell -command "2+2"'
# Gives Winrs error: Access is denied.
Configuration for my user is following:
(Get-Item WSMan:\localhost\Service\RootSDDL).value
# O:NSG:BAD:P(A;;GA;;;BA)(A;;GA;;;S-1-5-21-3231263931-1371906242-1889625497-1141)S:P(AU;FA;GA;;;WD)(AU;SA;GWGX;;;WD)
(Get-PSSessionConfiguration -name Microsoft.Powershell).SecurityDescriptorSddl
# O:NSG:BAD:P(A;;GA;;;BA)(A;;GA;;;S-1-5-21-3231263931-1371906242-1889625497-1149)S:P(AU;FA;GA;;;WD)(AU;SA;GXGW;;;WD)
(In each security descriptor my user is given general access to protected object).
So what security descriptor should I set to make my winrs query work for non-admin user?

Answer 1

Hi Bunyk,
I can not recreate the erroe you posted, and please also post the screenshoot in your convenience.
I tested with a non-domain user but has the local admin permission of the remote computer, and this worked, before running the remote cmdlet in powershell, I also configured the TrustedHosts.
In addition, the access denied could be also caused to the Protocol Filtering on the remote server, for more detailed information, please refer to this thread:
winrs error:access is denied
I hope this helps.