Howto restrict IPv6 listening address in lighttpd on Debian

I try to make a lighttpd only available from localhost on a Debian system. The following lines are in /etc/lighttpd/lighttpd.conf server.port = 80 server.bind = "127.0.0.1" server.use-ipv6 = "disable" However, the webserver is running on all IPv6 addresses, too: # netstat -tupan|grep lighttpd tcp 0 0 127.0.0.1:80 0.0.0.0:* LISTEN 519887/lighttpd tcp6 0 0 :::80 :::* LISTEN 519887/lighttpd With the following line instead of the formerly printed lines in the config file, the server won't start: server.bind = "[::1]" It means, I've got only an error message about a used port, but the port ist not used! # netstat -tupan|grep LISTEN|grep 80/; lighttpd -f /etc/lighttpd/lighttpd.conf; netstat -tupan|grep LISTEN|grep 80/ 2023-04-27 16:50:24: (network.c.537) can't bind to socket: [::1]:80: Address already in use How I can restrict lighttpd to listen only on localhost (only IPv4, only IPv6 or IPv4 and IPv6)