HI Bojan,
If the native SCOM template for Port monitoring does not help, than you can try this one:
Monitor network connections and listening ports with SCOM
https://4sysops.com/archives/monitor-network-connections-and-listening-ports-with-scom/
I think the Solution of Ruben will help you achieving this. Please take a look at it, haven't tried it myslef, but knowing Ruben it dont doubt that it will work just fine.
As mentioned, you can of course try monitoring port 53 on the DNS servers the native way - using the Port template in SCOM. Here a screenshot:
Hope I was able to help you out!
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Regards
Stoyan Chalakov