Nagios Support Forum

I can find online upgrade instructions, and both online/offline fresh install instructions, but no offline upgrade instructions.

We are closed-network but we have a local yum repository. I just need a list of RPMs to make available. Help!

how did you perform the installation?

if you performed our offline installation via RPM, you would just follow the instructions here
https://repo.nagios.com/?repo=offline#install

However run ./upgrade instead of ./fullinstall