Problems with Portainer Business Edition running offline

[V4ler1an]

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I previously had Portainer CE running offline on my Ubuntu server. I enabled Internet access when getting it setup but kept it offline the rest of the time. I started / stopped a selection of containers using the API over my local network. I only enabled the Internet when it was required. Everything worked great.

Recently I decided it would be sensible to reduce the API user's access permissions on Portainer and installed a Business Edition license to unlock the required features. Since then, if I try to start / stop containers in the same way as before, (no changes made to permissions or any other config yet, just the license upgrade), the web GUI hangs with a spinning circle in the top right for extended periods. Eventually it times out and the GUI comes back. I can then see the container has started / stopped as expected though. When the Ubuntu host is given full Internet, everything runs normally.

After some testing, adding the docker.io registry address as a firewall exclusion cured the issue. Why is this only a problem with BE? Is it possible to turn off the automatic image indicator refreshing? I notice running 'refresh image indicators' manually triggers the same hang so this seems to be the cause.