On Mon, Jul 29, 2024 at 03:33:03PM +0000, Leonardo Figueiredo wrote:
> - /var/log/apache2/error.log:
> 
> [Mon Jul 29 11:32:05.836354 2024] [proxy:error] [pid 345333:tid 
> 140116479678144] (111)Connection refused: AH00957: http: attempt to connect 
> to 127.0.0.1:4000 (localhost:4000) failed
> [Mon Jul 29 11:32:05.836460 2024] [proxy_http:error] [pid 345333:tid 
> 140116479678144] [client 40.77.167.51:11411] AH01114: HTTP: failed to make 
> connection to backend: localhost
> [Mon Jul 29 11:32:05.860228 2024] [proxy:error] [pid 345492:tid 
> 140115657619136] (111)Connection refused: AH00957: http: attempt to connect 
> to 127.0.0.1:4000 (localhost:4000) failed
> [Mon Jul 29 11:32:05.860310 2024] [proxy_http:error] [pid 345492:tid 
> 140115657619136] [client 52.167.144.231:30290] AH01114: HTTP: failed to make 
> connection to backend: localhost
> [Mon Jul 29 11:32:06.461271 2024] [proxy:error] [pid 345492:tid 
> 140115632441024] (111)Connection refused: AH00957: http: attempt to connect 
> to 127.0.0.1:4000 (localhost:4000) failed
> [Mon Jul 29 11:32:06.461365 2024] [proxy_http:error] [pid 345492:tid 
> 140115632441024] [client 40.77.167.51:11393] AH01114: HTTP: failed to make 
> connection to backend: localhost

"Connection refused" means that nothing is listening to port 4000 on
localhost.  I would start by figuring out why.  I would try to find
out what the front-end *is* listening for, and correct that if
necessary.  Here 'netstat -tlnp | grep PM2' worked for me.

When certain that the front end is listening properly, if the problem
persists then I would next check for firewall REJECT rules that might
be blocking connections.

> PS: sorry for my English, I hope you can understand me well

Your English is quite good enough for me to understand.

-- 
Mark H. Wood
Lead Technology Analyst

University Library
Indiana University Indianapolis
755 W. Michigan Street
Indianapolis, IN 46202
317-274-0749
library.indianapolis.iu.edu

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