Site Status is on and off after upgrade

Two days ago I made an upgrade after a long time and from the morning my site’s online status is on and off.

I tried a rebuild and this is the error, can someone pls help me out

Error response from daemon: Cannot restart container app: driver failed programming external connectivity on endpoint app (4fdb5dacbe7b1a73c4fbf40fac3d0aecdbae499eb6409aa830a5e1af9931fdf1): Error starting userland proxy: listen tcp 0.0.0.0:80: bind: address already in use

this link here helped me fix it but I’m not sure if it’s a permanent solution. I would still welcome a reply from an expert.

Make sure you don’t have any other competing web servers running on the machine.

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No,it has only one discourse installation for the last 2 years. this caught me by surprise.

If thats the case this thread can be closed. Thanks