Calibre server can be accessed by ipv6 loopback but not ipv4 loopback or ipv4 address

by Rubin|Published March 14, 2025

Running a Calibre server on my laptop running Win11 Pro.
http://[::1]:8080/ works fine.
http://127.0.0.1:8080/ err: can’t reach this page, conn reset
http://192.168.1.135:8080/ err: can’t reach this page, conn reset

All my computers can connect and view each other using ipv4
I can even view the webpage on my server using 192.168.20:8080
Turning off firewall did not help. (Calibre is on approved list)

Flushed DNS and ARP

Ubiquiti router and switches