Hopefully an isolated case but I performed an upgrade on our 3 poller NPM cluster last Friday. It looks like I lost polling on anything assigned to the primary poller after the upgrade. When clicking on "List Resources" on any node associated with the primary pollers, is just goes to Wait... forever (being the 2-hours I waited before giving up). If I change to a different poller, I am able to list resources within 30-seconds. I also noted one of our network switches failed. Upon reboot it shows in warning state with 100% packet loss even though there is none. I've opened a ticket but wanted to see if anyone else was experiencing similar problems.
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