Could you double-check that your ufw rules are referring to the correct
NIC? Interface naming has changed a few times recently, and I have a
suspicion that your problems may be a result of the new names not
matching existing ufw rules.

Perhaps disable ufw entirely for testing?

Thanks

** Changed in: ufw (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1574474

Title:
  Xenial fails to connect my intermediate AP (dhcp multicast)

Status in ufw package in Ubuntu:
  Incomplete

Bug description:
  Hi,

  On Xenial, neither manual nor automatic tools can connect to an intermediary 
AP (TPLINK  TL-WR702N).
  Ipv6 is disabled by kernel commandline. It worked fine on 12.04

  uname -a output:  Linux xxxx 4.4.0-21-generic #37-Ubuntu SMP  2016
  x86_64 x86_64 x86_64 GNU/Linux.

  only when connecting to this AP, UFW throws a
  [UFW BLOCK] IN=wlp3s0 OUT= MAC=78:e4:00:91:97:fb:dc:53:7c:44:69:5c:08:00 
SRC=192.168.0.1 DST=224.0.0.1 LEN=28 TOS=0x00 PREC=0xC0 TTL=1 ID=15995 PROTO=2 

  the SRC here is my router,there is another line with src=192.168.0.254
  which is my AP

  I've done a sudo sysctl net.ipv4.icmp_echo_ignore_broadcasts=0;
  nothing changed.

  when connecting, dhcp also throws a: addr6conf: unsuported family
  address.

  when setting up manually IPv4 addresses, my AP is not pingable (no
  mention of my router, which is behind)

  thanks

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