looking for some documentation i found the comment lines posted below in an old thread.
so 0.0.0.0: port works for me because it accepts all IP4 only and I don't use IP6
maybe OP has some IP6 in use - that would explain why he had to change to a different setting
is is from a 2015 thread but shoudl still be correct ?
# By default, the calibre content server listens on '0.0.0.0' which means that it
# accepts IPv4 connections on all interfaces. You can change this to, for
# example, '127.0.0.1' to only listen for connections from the local machine, or
# to '::' to listen to all incoming IPv6 and IPv4 connections (this may not
# work on all operating systems)
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