can't connection to the server at localhost:81 when I installedl obs

I install obs in opensue 11.3 by zypper the rpm which as below list:
obs-api-2.1.6-6.20.i586.rpm
obs-common-2.1.0-1.1.i586.rpm
obs-server-2.1.6-6.20.i586.rpm
obs-utils-2.1.6-6.20.i586.rpm
obs-worker-2.1.6-6.20.noarch.rpm

perl-BSSolv-0.1-23.1.i586.rpm

rubygem-daemons-1.0.10-4.2.i586.rpm
rubygem-delayed_job-1.8.4-2.2.i586.rpm
rubygem-exception_notification-1.0.20090728-2.2.i586.rpm
rubygem-gruff-0.3.6-3.2.i586.rpm
rubygem-libxml-ruby-1.1.3-2.2.i586.rpm
rubygem-rmagick-2.12.2-2.3.i586.rpm
,
and I config obs following from the README.SETUP, but still can’t open the web service.
somebody can help me ? thanks.