Rails puts and pp logs are showing up on browser

Hi,

I am using Ruby 1.8.3 and Rails 0.14.2, running on Linux (Fedora) and
lighttpd.

When there is an exception during RSS parsing or Webservice call, I am
getting the error messages shown on the browser. This happens only when
there is an exception thrown. This happens only on Linux, not on windows
server.

lighttpd has write access to the log files.

Am I missing some configuration or settings?

thanks
nandhu