dkimproxy unable to read private key

I just found this error in my server logs

May 17 14:55:07 marcus dkimproxy.out[1005]: signing error: Error: cannot read /etc/ssl/private/dkim_server/dkim_server.key: Permission denied

dkimproxy runs as dkim user, member of both dkim and ssl-private groups. The key file is chmodded as follows

# l /etc/ssl/private/dkim_server/

drwxr-x---  2 dkim ssl-private 4096 12 dic  2009 ./
drwxr-x--- 10 root ssl-private 4096 11 apr 16.37 ../
-rw-r-----  1 dkim ssl-private  891 12 dic  2009 dkim_server.key
-rw-r-----  1 dkim ssl-private  272 12 dic  2009 dkim_server.pub

I also did as root sudo -u dkim cat /etc/ssl/private/dkim_server/dkim_server.key and it works.

I had the same problem yesterday but I simply forgot to add dkim to ssl-private group. After I fixed that I thought I was done

Now seems that dkimproxy is still unable to read the private key.

What could I do to fix this problem?

It now works.

Edited /etc/init.d/dkimproxy

Changed

DKIMPROXYGROUP=ssl-private

and restarted...