How to open a web server port on EC2 instance

Follow the steps that are described on this answer just instead of using the drop down, type the port (8787) in “port range” an then “Add rule”.

Go to the "Network & Security" -> Security Group settings in the left hand navigation

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Find the Security Group that your instance is apart of
Click on Inbound Rules
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Use the drop down and add HTTP (port 80)
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Click Apply and enjoy

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