My system is Xenialpup 7.5 (Puppy-LINUX)
firefox 63 and calibre 3.34; I have opened doors and forwarded.
Following this guide:
http:///manual.calibre-ebook.com/server.html
I started the server and connecting with 127.0.0.1:8080
I could try the user and password function and open the library to see and download books. The next step to try the same functions from a LAN terminal (PC with same system and same firefox), Firefox communicates that it is impossible to connect: 192.168.1.2:8080.
If there was someone among you to show me where to start investigating, I'll be grateful.
sonia