Error code
Sophos All models code UTM-9452
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Meaning
Problem: This issue can happen when PMTU discovery does not work as expected on HA link. There is no side effect other than the occasional error message from Pluto. Solution: Ensure there is no PMTU black hole in HA link path
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Address of this page: https://www.remfixit.com/tr/sophos/tum-modeller/utm9452