It took over a week to get through all the requirements (upgrading SQL, Product Compatibility, and near continuous DB reindexing). The last major step is migrate SHA1 certificates, which was very successful after an hour (98%).
However, once the process was complete, I was unable to run client tasks, scheduled or manually. So after some research, I followed https://kc.mcafee.com/corporate/index?page=content&id=KB66616 and upgraded the SSL certificatein steps 8-15. When I did that, I was able to run client tasks, but all of my agents stopped checking in!
So I ended up reinstalling all my agents.
After such a total rigmarole to update ePO, I am completely baffled why I had to deploy every agent in the end. What was the purpose of the migrating certificates by agent if we were going to end up in a quagmire? I really wish McAfee would provide its customers an image for ePO on a Linux platform so we would not have to waste so much time with all the McAfee incompatibility quirks during an upgrade.
Without looking at data to see what went wrong, you may or may not have had to redeploy agents - much of that is fixable without that. I can't give you cause without seeing what the client errors were, epo server errors and state. As for epo on Linux, please submit an idea for it per kb60021.
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I am not sure it is productive to open another support case and dissect the root-case. I was simply trying to say our client tasks were reliable before the upgrade. I followed all the steps from the guide and engaged support during the process. After the upgrade, I could not run a client task.
I decided to go with the KB66616 steps 8-15 (based on a community post and my research) and the client tasks functionality returned, but I had to redeploy the agents.
I think by following all the checklist steps (including all pre-update checks), the client tasks should not have gotten to the point where they were not working. The wizard should test that functionality and identify that to the ePO administrator. That is all I am trying to say.
I did not know I had access to a feature request, I will submit my idea for a Linux image as you recommended.
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