Beta9 actually introduced this for me. I cannot ping docker.local and none of my docker backed services can connect. HELP!
$ pinata diagnose
OS X: version 10.11.4 (build: 15E65)
Docker.app: version v1.11.0-beta9
Running diagnostic tests:
[OK] docker-cli
[OK] Moby booted
[OK] driver.amd64-linux
[OK] vmnetd
[OK] osxfs
[OK] db
[OK] slirp
[OK] menubar
[OK] environment
[OK] Docker
[OK] VT-x
Docker logs are being collected into /tmp/20160429-095823.tar.gz
Most specific failure is: No error was detected
Would you like to upload log files? [Y/n]: Y
Your unique id is: 8067B04A-FEE5-43FF-AAF0-B5A11BD25D7F
Please quote this in all correspondence.
$ ping docker.local
ping: cannot resolve docker.local: Unknown host