Hello,

it seems that knotd suffers from the same issue as described here: http://lists.scusting.com/index.php?t=msg&th=244420

I have Debian 7.0 with http://deb.knot-dns.cz/debian/dists/wheezy/main/binary-i386/net/knot_1.2.0-1~bpo70+1_i386.deb installed and this is in /var/log/syslog after reboot:

Jun  3 22:37:43 ns knot[2091]: Binding to interface 2xxx:xxxx:xxxx:xxxx::1 port 53.

Jun  3 22:37:43 ns knot[2091]: [error] Cannot bind to socket (errno 99).

Jun  3 22:37:43 ns knot[2091]: [error] Could not bind to UDP interface 2xxx:xxxx:xxxx:xxxx::1 port 53.

I have a static IPv6 address configured in /etc/network/interfaces. Restarting knot later binds to this IPv6 address without any problem - it is only the first start which fails (during OS booting). What do you think that is the proper way of making knotd reliably listen on a static IPv6 address? I would prefer if I could avoid restarting knotd.