Note from @andschwa (hijacking for visibility):

As this is the oldest issue, I'm going to keep it and close all others. New-PSSession (whether its loopback on the local machine or not) is PSRP (as is Enter-PSSession and Invoke-Command etc.), which is in progress but not yet supported. Please follow the progress on the PSRP on Linux repo. We (mostly @paulcallen and @palladia) are working hard to get this ready, and clearly hear how much you all want it! Please be patient while we finish the implementation.

Original issue:

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Steps to reproduce

new-pssession

Expected behavior

graceful failure

Actual behavior

Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object.
   at System.Management.Automation.Remoting.PrioritySendDataCollection.Clear()
   at System.Management.Automation.Remoting.Client.BaseClientTransportManager.CloseAsync()
   at System.Management.Automation.Remoting.Client.WSManClientSessionTransportManager.CloseAsync()
   at System.Management.Automation.Remoting.Client.BaseClientTransportManager.Finalize()
Aborted (core dumped)

Environment data

Linux jimtru-ops2 4.2.0-35-generic #40~14.04.1-Ubuntu SMP Fri Mar 18 16:37:35 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Please fill in the results of the following commands:

$ dotnet --info
.NET Command Line Tools (1.0.0-rc2-002543)

Product Information:
 Version:     1.0.0-rc2-002543
 Commit Sha:  38d0c28a1e

Runtime Environment:
 OS Name:     ubuntu
 OS Version:  14.04
 OS Platform: Linux
 RID:         ubuntu.14.04-x64


$ git rev-parse HEAD && git status
PS> git rev-parse HEAD;git status
aa9547930792e5d536f17002a69346cc6c9a0612
On branch master
Your branch is up-to-date with 'origin/master'.

Untracked files:
  (use "git add <file>..." to include in what will be committed)

        dotnet-host-ubuntu-x64.latest.deb
        dotnet-sdk-ubuntu-x64.latest.deb
        dotnet-sharedframework-ubuntu-x64.latest.deb
        newitem.tests.ps1

nothing added to commit but untracked files present (use "git add" to track)