access to log directory denied

G'dday,

I'm very new to Dan's tools - please excuse me if I'm missing something
absurdly obvious :)

I've just set up djbdns along with daemontools and ucspi-tcp.  I've followed
the instructions verbatim and have a my first working dns which I'm pretty
chuffed about :)

I'm having a problem with logging though.  readproctitle ps listing looks as
follows:

root      1459  1454  0 Aug30 ?        00:00:00 readproctitle service
errors: ...nied?setuidgid: fatal: unable to run multilog: access denied?setu

Permissions in /service/tinydns/log are set as follows:

[root] /etc/tinydns/log# ls -l
total 12
drwxr-sr-x    2 Gdnslog  Gdnslog      4096 Aug 31 01:40 main
-rwxr-xr-x    1 root     root           51 Aug 30 03:36 run
-rw-r--r--    1 Gdnslog  Gdnslog         0 Aug 30 03:36 status
drwx--S---    2 root     root         4096 Aug 31 02:21 supervise

My password file entries for the tinydns accounts are:

Gtinydns:x:500:500::/home/Gtinydns:/sbin/nologin
Gdnslog:x:501:501::/home/Gdnslog:/sbin/nologin

I created the entries with:

>useradd Gtinydns
>useradd Gdnslog
>usermod -L Gtinydns
>usermod -L Gdnslog

and then after reading that it's a good idea on the net:

>usermod -s /sbin/nologin Gtinydns
>usermod -s /sbin/nologin Gdnslog

I can manually recreate the error with:

[root] /etc/tinydns/log# setuidgid Gdnslog multilog ./main
setuidgid: fatal: unable to run multilog: access denied
[root] /etc/tinydns/log#

But the following does work:

[root] /etc/tinydns/log# setuidgid Gdnslog touch main/fred
[root] /etc/tinydns/log# ls -l main
total 0
-rw-r--r--    1 Gdnslog  Gdnslog         0 Aug 31 02:26 fred
[root] /etc/tinydns/log#

Any clues as to what I've over looked is greatly appreciated,

Andy.