Issue and few questions with Letsencrypt

Hey guy

So I just setup Letencrypt and got it to work but had a few issues.

I have been using no-ip and have ddns setup on my router as I use it for remote desktop and few other things.

I was able to connect using my cell network connection but now I am unable to connect with my localip:8123. If I use the domain.ddns.net address on my local network it just takes me to my router login page. On my cell with wifi on it seems to work also doesnt always connect. Anyone know why?

Also will I still be able to use that domain with ports to connect to my other existing services? I have diabled ssl for now until I can figure this out.