Q:

Nuget sources update fails to update

Following the nuget command line reference, I update an internal nuget source URL to a new URL.   The update fails. 
Execute
nuget sources
Output

nuget.org [Enabled]
http://www.nuget.org/api/v2
InternalFeed [Enabled]
http://oldserver:8888/nuget

Execute

nuget sources Update -Name InternalFeed -Source http://newserver:8888/nuget

Package source "InternalFeed" was successfully updated. 

nuget sources

Output

nuget.org [Enabled]
http://www.nuget.org/api/v2
InternalFeed [Enabled]
http://oldserver:8888/nuget

Expected output

nuget.org [Enabled]
http://www.nuget.org/api/v2
InternalFeed [Enabled]
http://newserver:8888/nuget

Actual output does not match expected output.   How can I update the InternalFeed URL?   

A:

There was a file in the root directory called NuGet. Config.   This file contained the oldserver value.   I removed the value from NuGet. Config.   The update took after making said change.