Have RedHat Enterprise 5.2 with new subscription, cannot update packages

Hello,

I have a DELL PowerEdge server which is currently running RedHat Linux 5.2. I have software on this server that requires me to download some updated packages for telnet and libraries through the package manager but I keep receiving an error. I have recently bought a new subscription to RedHat and need some help figuring out why I cannot update this version of the OS. I do not desire to fully install a new version of RedHaat as this may lead to severe downtime for client services and also may create complications when installing drivers, etc, with the new install.

Is this a common issue? I have not had a RedHat subscription for a few years and feel that my packages are very far behind in regards to updates.

Any and all assistance would be very much appreciated. Thank you.

Regards.