OK, the leak was the line going out to the gas powered security light pole on the front lawn. Since I'm not using the light, the gas company capped off the line and all is well with the exception of a small leak from the line going to the pilot light on the gas hot water heater.

Apparently, the brass nut that tightens on the right (stainless steel line) isn't quite tight enough. Is there anything like blue lock tite that I can put on the threads to help stop this miniscule leak? Or, should I simply try to tighten the brass nut? (see photo attached).

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