[Proftpd-user] proftpd - auth mysql - Permission denied

[Andre H. <and...@gm...>]

proftpd 1.3.2c

Hello List,

changed authentication from mod_auth_unix to mod_sql
It seems that authentication itselfs works but there must be a problem with 
homedir.
I think it is an conf issue but i dont see it.

This is significant output from proftpd -n -d 3

my.servername.com (::ffff:ip.ip.ip.ip[::ffff:ip.ip.ip.ip]) - FTP session 
opened.
my.servername.com (::ffff:ip.ip.ip.ip[::ffff:ip.ip.ip.ip]) - user 'username' 
authenticated by mod_sql.c
my.servername.com (::ffff:ip.ip.ip.ip[::ffff:ip.ip.ip.ip]) - Preparing to 
chroot to directory '/www/htdocs/username'
my.servername.com (::ffff:ip.ip.ip.ip[::ffff:ip.ip.ip.ip]) - Environment 
successfully chroot()ed
my.servername.com (::ffff:ip.ip.ip.ip[::ffff:ip.ip.ip.ip]) - unable to chdir 
to / (Permission denied), defaulting to chroot directory 
/www/htdocs/username
my.servername.com (::ffff:ip.ip.ip.ip[::ffff:ip.ip.ip.ip]) - username 
chdir("/"): Permission denied
my.servername.com (::ffff:ip.ip.ip.ip[::ffff:ip.ip.ip.ip]) - FTP session 
closed

This "username chdir("/"): Permission denied" is exactly my problem i cannot 
solve

This is my sql-conf-section:

SQLAuthTypes Plaintext
SQLAuthenticate users
#anonymized
SQLConnectInfo databasename@host database_user user_password
SQLUserInfo ftpuser userid passwd uid gid homedir shell

This is csv-content of table ftpuser
"2";"username";"mypass";"500";"500";"/www/htdocs/username/";"/bin/false";"0";"0000-00-00 
00:00:00";"0000-00-00 00:00:00"

THis is conf of main-section:

TimesGMT                        off
ServerName                      "ProFTPD"
ServerType                      standalone
Identlookups                    off
DeferWelcome                    on
Port                            21
UseReverseDNS                   off
DefaultServer                   on
MaxInstances                    50
TimeoutStalled                  300
TimeoutLogin                    60
MaxLoginAttempts                3
MaxClientsPerUser               10
PassivePorts                    50000 50030
ListOptions                     " -a"
<Global>
Umask                         022
DefaultRoot ~
</Global>
user                            nobody
Group                           nogroup

Dont looks very spectacular to me.
What could be the issue?

Thanks,
Andre