TL;DR; Explains the TF14002 error in TeamPlain, where NT AUTHORITY\NETWORK SERVICE lacks valid user group access, and discusses possible causes like proxy server settings.

Some prople have encountered this error when viewing the source control tab in TeamPlain:
System.Web.Services.Protocols.SoapException: TF14002: The identity NT AUTHORITYNETWORK SERVICE is not a member of the Team Foundation Valid Users group.
at Microsoft. TeamFoundation. VersionControl. Server. Repository. GetRepositoryProperties()
Now in the TeamPlain forums a couple of posts defign the problem, but no solution:
SoapException with Source tab posted 03-27-2007 4:39 AM
TF14002: The identity NT AUTHORITYNETWORK SERVICE is not a member of the Team Foundation Valid Users group. posted 05-17-2006, 4:31 AM
1.1 Problems posted 10-14-2006, 12:37 AM
It seams that this is an internitant problem and may be caused by proxy server settings.
This has only hapened to one of my users sos far and not to me at all.
We will see…
Technorati Tags: ALM
If you've made it this far, it's worth connecting with our principal consultant and coach, Martin Hinshelwood, for a 30-minute 'ask me anything' call.
We partner with businesses across diverse industries, including finance, insurance, healthcare, pharmaceuticals, technology, engineering, transportation, hospitality, entertainment, legal, government, and military sectors.

Higher Education Statistics Agency

Alignment Healthcare
CR2

SuperControl

YearUp.org

Capita Secure Information Solutions Ltd

Akaditi
Boxit Document Solutions

Freadom

Emerson Process Management

Flowmaster (a Mentor Graphics Company)

Brandes Investment Partners L.P.

Lockheed Martin

Cognizant Microsoft Business Group (MBG)

New Signature

Microsoft

Graham & Brown

Illumina

Ghana Police Service

Royal Air Force

Department of Work and Pensions (UK)

Nottingham County Council

Washington Department of Transport

Washington Department of Enterprise Services

YearUp.org
NIT A/S

Ericson

Teleplan

Boeing

Workday