tcp flag s

i have a static ip from my isp and it is and i am using to send and get emails using smtp solution or MX RECORD,everytimes i get message from firewall zone alarm pro that tcp port 2751 tcp flag s want to access my computer and i dont know if this ip it is included in my static ip or no really everytimes i stop this to access to my netbios computer any idea about this
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As long as everything is working, then do NOT allow access to any additional ports, without knowing precisely what it is being used for.

I hope this helps !
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