Today I found that about half of the devices we monitor in NTA haven't received flows since before the upgrade to NTA 4.2.2 last week. The devices that are not polling show "Netflow v0" when you mouse over the device, while ones that do work are showing "Netflow v9". I checked the NTA Settings page and it shows the Primary and Additional Pollers are all showing UP, so I'm unsure why it isn't polling half of them. Any suggestions on trying to find out what is going on?
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