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.

Sage
CR2

Brandes Investment Partners L.P.

Xceptor - Process and Data Automation

Higher Education Statistics Agency

Kongsberg Maritime

Graham & Brown

Genus Breeding Ltd

Lean SA

Freadom

Workday

Slicedbread

Alignment Healthcare
Boxit Document Solutions

Flowmaster (a Mentor Graphics Company)

Trayport
NIT A/S

DFDS

Washington Department of Transport

Ghana Police Service

Department of Work and Pensions (UK)

Nottingham County Council

Royal Air Force

New Hampshire Supreme Court

Xceptor - Process and Data Automation

Bistech

ALS Life Sciences

Epic Games

Trayport

New Signature