What are the rules regarding casing of values for environment variable USERNAME in Windows?

One of my customers says that in his AD usernames have mixed case sometimes and besides that, that people are able to successfully login using another casing of usernames. So there might be an "ExampleUser" in the AD and Windows allows them to login with "exampleUSER" etc. as well.

But what is the impact on the environment variable "USERNAME"?

I have tested a bit myself without an AD and in all of my tests "USERNAME" had the value of the username as it has been created. So in case of "ExampleUser" created in Windows, using the login "EXAMPLEuser" provided "ExampleUser" as "USERNAME". That happened for RDP where users are free to input usernames as well as using "runas".

My customer said that this is not the case for him at least sometimes, but instead if "ExampleUser" in the AD logs in using "exampleUSER", "USERNAME" really contains the value of the current login, "exampleUSER". I've found another question describing that as well:

> For some users in this office, %USERNAME% is always in the case they type it when logging in.

> For other users, %USERNAME has until recently always been in the canonical case (for a user logging in as elenasimpson it returns ElenaSimpson), but last week mysteriously started only doing this sometimes and the rest of the time returning it as typed. Rebooting often toggles to the other behaviour.

What I did not found is any official docs from MS of what is the value of "USERNAME" under which setups and inputs of users. Are there any rules one can rely on?

Thanks!

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Hi,

für Windows7 geht es am besten mit SMB:
https://help.synology.com/dsm/?secti...acnfs_win.html

Hier eine Übersicht aller Ports, unter File Transferring->CIFS findest du die benötigten.
DiskStation Manager - Knowledge Base | Synology Inc.

Zum Thema NFS habe ich das in der MS-Hilfe gefunden, ein Client gibt es schon in Windows7, muss nur aktiviert werden.

NFS client for Windows 7 - Microsoft Community

Eine Frage zum Verständnis:

Aber du gehst doch über ein Router ins Internet oder? Also FritzBox oder ähnlich. Wenn dort keine Ports auf das NAS oder dein Windows7-PC geleitet sind, dann ist das schon so ziemlich sicher.

 

Thanks for the hint, I created another thread there:

What are the rules regarding casing of values for environment variable USERNAME in Windows?

 

Hi,
Erstmal hier eine kurze Info was ein Coa ist. Was ist das Windows-Echtheitszertifikat (Certificate of Authenticity)?

Das beschreibt im Endeffekt ein Zertifikat was von Microsoft kommt ein sichtbares und ein unsichtbares Siegel bedruckt ist wo dann der Key drauf steht. Solche Sachen würde ich grundsätzlich bei alternate, mindfactory oder direkt bei microsoft bestellen ist zwar ein bisschen teurer aber du kannst sicher seinndas du eine orginal Lizenz erhältst. Windows mit Plattform: Windows 8 Preisvergleich | Geizhals Deutschland