mysterious port # change

mysterious port # change

This is the second time that this has happened on one of my routers and I don't have a clue as to why. I've installed Netflow as directed with the destination IP and port 9996, but then a few days later I notice that I'm not getting any flow from a router. When I look at it's config, the port number has changed to 2055. Any ideas of what would cause this?

Thanks

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