Last week, I upgraded one of my company's server clusters from CF 5 to CF MX. The install went fine. However, when I tried to apply updater 3 to both servers, it worked fine on one of them, but refused to install on the other.

I tried everything I could think of (initially) - I stopped all of the CF and IIS services ahead of time. I rebooted and tried again, nothing. Finally, I opened the task manager and noticed that an instance of jrun.exe was still running, even though I had stopped all CF services. Highlighting it and clicking End Process had no effect - I just got an access denied error message.

I was finally able to resolve the issue by setting all of the CF services to manual and rebooting the server. Once I did that, the jrun.exe process was no longer running and I was able to complete my updater 3 installation with no additional problems.