[Samba] max. length of a username

John H Terpstra - Samba Team jht at samba.org
Sun Jul 5 22:52:18 GMT 2009

Helmut Hullen wrote:
> Hallo,
> how long may a valid samba username be?
> Viele Gruesse!
> Helmut

Usually the length of a username is limited by the host operating system.

Many older UNIX systems limit usernames to 8 characters.

Under OpenSUSE 11.2 (not yet released) it is possible to use the
"useradd" utility to add a username up to 29 characters in length.  It
is possible to add that user to the tdbsam password backend using
"smbpasswd -a".  That account is valid within Samba (at least using

So the answer is: "What is the limit of the operating system that is
hosting your Samba?"

- John T.

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