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I noticed that after upgrading from 6.8.3 to 6.9.1 that one of my docker containers (which run's on the host) lost its connectivity to a docker container which runs on a user defined network with its own IP. I could not understand why, as all the settings - including the "Host Access to custom networks" option, were checked. After a little playing, I stopped the array, turned the option off - saved. Then turned the option on - saved. Started the array and communication between the docker containers was restored. I am not sure if I can replicate this now that it has been fixed and I have obviously already upgraded but I hope this serves to help someone else who finds themselves in this situation.