Insufficient server config - no servers found. Aborting.
 

I installed 'yum' on Red Hat 9.

Trying to upgrade it:

[mike@www source]$ sudo yum upgrade
Insufficient server config - no servers found. Aborting.

How to fix the problem?

Thanks

I'm sorry to say that the answer is simple but probably not to your liking. RHL is deprecated and moved to Fedora years ago. Therefore you can fix the problem but you won't find anything in any repo's that will make using RHL secure. Please move to Fedora if you like bleeding edge, anything RHEL-alike like CentOS if you don't like paying for RHEL or any other current and maintained distro.