ContentAvailable ignoring update with no DPs for content request

I received this message "ContentAvailable ignoring update with no DPs for content request" from SMS 2003 client systems that were behind a firewall, using private addresses, such as 172.35.0.0. These systems were on the public side, but was changed a few months ago.

Simply solved the problem by putting the private subnet in the boundry for our SMS Site server. Everything is fine now.