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This pull request fixes the issue where the portMappingLoop function was prematurely terminated, causing the defer function to be called and trigger "Deleting port mapping" 2 minutes after the initial launch. The fix involves changing the return statement to a continue statement in order to continue the loop.
Fixes #609.
Background: this has been introduced with ethereum/go-ethereum#26359. If this PR solves the issue we will make a PR at ethereum/go-ethereum as well.