Yep, the limit is 16 under standard Unix distributions, don't know if that's
the same with ftp daemons too.

Nate Carlson <natecars at real-time.com> writes:

> Is there a limit to the number of groups a user can be part of?
> 
> I'm having trouble with a client machine where a user is a part of about
> 50 groups (eek, i know), and everything works fine from the command line,
> but when the user tries to modify files through ftp (running ProFTPd
> 1.2.2rc3), it works if the group name is within the first 512 characters
> that get returned when you runs 'groups username', but gets a permission
> denied if it's after the 512-character boundary.
> 
> I'm guessing that it's an issue with the buffer size in ProFTPd, but just
> thought I'd ask if there is a theoretical maximum to the number of groups
> a user can be in (or the number of characters that make up the group name.
> :)
> 
> -- 
> Nate Carlson <natecars at real-time.com>   | Phone : (952)943-8700
> http://www.real-time.com                | Fax   : (952)943-8500
> 
> 
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-- 
Jon Schewe | http://mtu.net/~jpschewe | jpschewe at mtu.net
For I am convinced that neither death nor life, neither angels 
nor demons, neither the present nor the future, nor any 
powers, neither height nor depth, nor anything else in all 
creation, will be able to separate us from the love of God that 
is in Christ Jesus our Lord. - Romans 8:38-39