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I am trying to configure a R Shiny Server on CentOS 6.7, and I need to allow incoming TCP traffic on Port 3838.

I am new to Linux and was wondering how I can modify my settings to allow incoming traffic on Port 3838?

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This is command for the your question.

/sbin/iptables -I INPUT -s ( source ip range) -p tcp --dport 3838 -j ACCEPT

where source ip mean machine from where you want to access the port

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