Well... If you already have NodeBB running on port 80 without nginx/Apache proxy, then you can not assign another service on the port as well. I recommend you to set up an nginx/Apache proxy for NodeBB and create virutal hosts for each service you want to run on port 80 (this way you can run multiple services/sites on port 80).
Problem installing NodeBB
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First of all, I'm rather new to web development in general. I wish to learn through this project.
I apologize in advance should you find my problem to be self explanatory, but I can't figure out what's wrong, even by searching on Google.
As you can see in the image below, I'm running Redis.
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Also it looks like the redis version is a little old, you might want to upgrade that too: https://community.nodebb.org/topic/5935/problem-with-redis-upgrade
