This problem seems to be caused by a duplicate address, when another host is trying to use the same address as the NTP server. I am using ntp version 4.2.8p9, with two local patches applied.
In /var/log/ntp.log, the following three errors are repeated many times: bind(20) AF_INET6 fe80::250:56ff:fe84:8834%11#123 flags 0x1 failed: Cannot assign requested address unable to create socket on br1 (100384) for fe80::250:56ff:fe84:8834%11#123 failed to init interface for address fe80::250:56ff:fe84:8834%11 In /var/log/dmesg, there are a few of these: IPv6: br1: IPv6 duplicate address fe80::250:56ff:fe84:8834 detected! and a lot of these: br1: received packet on tap2 with own address as source address -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to ntp in Ubuntu. https://bugs.launchpad.net/bugs/569919 Title: ntpd constantly complains about being unable to create socket Status in ntp package in Ubuntu: Fix Released Bug description: Binary package hint: ntp It appears that ntpd synchronises the clock when starting, but then fails to continue to update the time. I've also found my syslog is filled with these messages from ntpd: Apr 25 21:11:26 nott ntpd[1121]: bind() fd 22, family 10, port 123, scope 2, addr fe80::230:1bff:fe80:d84b, in6_is_addr_multicast=0 flags=0x11 fails: Cannot assign requested address Apr 25 21:11:26 nott ntpd[1121]: unable to create socket on eth0 (6) for fe80::230:1bff:fe80:d84b#123 Apr 25 21:11:26 nott ntpd[1121]: failed to initialize interface for address fe80::230:1bff:fe80:d84b Apr 25 21:16:26 nott ntpd[1121]: bind() fd 22, family 10, port 123, scope 2, addr fe80::230:1bff:fe80:d84b, in6_is_addr_multicast=0 flags=0x11 fails: Cannot assign requested address Apr 25 21:16:26 nott ntpd[1121]: unable to create socket on eth0 (7) for fe80::230:1bff:fe80:d84b#123 Apr 25 21:16:26 nott ntpd[1121]: failed to initialize interface for address fe80::230:1bff:fe80:d84b Apr 25 21:21:26 nott ntpd[1121]: bind() fd 22, family 10, port 123, scope 2, addr fe80::230:1bff:fe80:d84b, in6_is_addr_multicast=0 flags=0x11 fails: Cannot assign requested address Apr 25 21:21:26 nott ntpd[1121]: unable to create socket on eth0 (8) for fe80::230:1bff:fe80:d84b#123 Apr 25 21:21:26 nott ntpd[1121]: failed to initialize interface for address fe80::230:1bff:fe80:d84b Apr 25 21:26:26 nott ntpd[1121]: bind() fd 22, family 10, port 123, scope 2, addr fe80::230:1bff:fe80:d84b, in6_is_addr_multicast=0 flags=0x11 fails: Cannot assign requested address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ntp/+bug/569919/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
