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For me this is a very standard setup, I had a ubuntu machine running docker and ufw as my firewall. If my firewall is enable the docker instances is unable to connect to outside $ docker run -i -t ubuntu /bin/bash WARNING: Docker detected local DNS server on resolv.conf. Using default external servers: [8.8.8.8 8.8.4.4] root@d300c5f17207:/# apt-get update Err http://archive.ubuntu.com precise InRelease 0% [Connecting to archive.ubuntu.com] W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/precise/InRelease W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/precise/Release.gpg Temporary failure resolving 'archive.ubuntu.com' W: Some index files failed to download. They have been ignored, or old ones used instead. Here is the ufw log showing the blocked connections from the docker container. $ sudo tail /var/log/ufw.log Jun 30 15:41:56 localhost kernel: [61609.503199] [UFW BLOCK] IN=testbr0 OUT=eth0 PHYSIN=veth8Rj8Nh MAC=fe:ff:ed:42:b0:01:0a:7c:42:7c:a6:72:08:00 SRC=172.16.42.2 DST=8.8.8.8 LEN=64 TOS=0x00 PREC=0x00 TTL=63 ID=14886 DF PROTO=UDP SPT=60192 DPT=53 LEN=44 Jun 30 15:42:01 localhost kernel: [61614.500867] [UFW BLOCK] IN=testbr0 OUT=eth0 PHYSIN=veth8Rj8Nh MAC=fe:ff:ed:42:b0:01:0a:7c:42:7c:a6:72:08:00 SRC=172.16.42.2 DST=8.8.4.4 LEN=64 TOS=0x00 PREC=0x00 TTL=63 ID=16137 DF PROTO=UDP SPT=44812 DPT=53 LEN=44 Jun 30 15:42:06 localhost kernel: [61619.498516] [UFW BLOCK] IN=testbr0 OUT=eth0 PHYSIN=veth8Rj8Nh MAC=fe:ff:ed:42:b0:01:0a:7c:42:7c:a6:72:08:00 SRC=172.16.42.2 DST=8.8.8.8 LEN=64 TOS=0x00 PREC=0x00 TTL=63 ID=14887 DF PROTO=UDP SPT=60192 DPT=53 LEN=44 I had try adding a rule using the ip. $ sudo ufw allow in from 172.16.42.2 $ sudo ufw allow out from 172.16.42.2 And have no change is still blocked. How can I esily allow all connections from the container to outside with a ufw rule?

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