I would like to access my domain using portnumber

I am using letsencrypt for my domain https://domain.com and i have another application that is served on port number 3001. I want to access that application using the link
https://domain.com:3001 , is that possible?

I am running the infra using docker-compose with docker wilder/nginx-proxy , jrcs/letsencrypt-nginx-proxy-companion

You can use your certificate for whatever application, on whatever port(s), you like--the cert isn't tied to a port number.

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So long as the application can use a certificate, yes, the LE certificate is no different than any other.

I mean, if the guy says "I want to use this certificate to secure my TELNET application".
Well that is a fail right from the start.

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