I have the same issue.
I added "Homer" as docker container from the CAS. Using "bridge" as network for the docker does not start the container and gives me:
Feb 6 16:49:53 SERVER kernel: docker0: port 5(veth9adb836) entered blocking state
Feb 6 16:49:53 SERVER kernel: docker0: port 5(veth9adb836) entered disabled state
Feb 6 16:49:53 SERVER kernel: device veth9adb836 entered promiscuous mode
Feb 6 16:49:53 SERVER kernel: docker0: port 5(veth9adb836) entered blocking state
Feb 6 16:49:53 SERVER kernel: docker0: port 5(veth9adb836) entered forwarding state
Feb 6 16:49:53 SERVER kernel: docker0: port 5(veth9adb836) entered disabled state
Feb 6 16:49:53 SERVER kernel: docker0: port 5(veth9adb836) entered disabled state
Feb 6 16:49:53 SERVER kernel: device veth9adb836 left promiscuous mode
Feb 6 16:49:53 SERVER kernel: docker0: port 5(veth9adb836) entered disabled state
When I give the container an IPv4 address from my custom network on interface br0 it starts up without errors.
So I guess its somehow related with the bridging.
Edit:
Maybe I may add: This is the only container that does not start using bridge as interface. I have several other containers running well with bridge.
Edit 2:
OK I guess I found it. For me it was port related. I had another docker container using port 8080. Unraid did not warn me that the port is already in use (I thought it did in the past, maybe a bug??). But I used another port and now the container starts.
