Comment 3 for bug 1998480

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Adam Collard (adam-collard) wrote : Re: All three controllers show the error: "Error: Node must be connected to a network."

Please attach an sos report on the failed node and confirm what firewalling (if any) is in place, and what proxy configuration (if any) is in place.

The telltale error from the logs is

request to http://127.0.0.1:5240/MAAS/metadata/2012-03-01/ failed. sleeping 1.: HTTP Error 502: cannotconnect

Can you confirm if that URL is accessible from the region controller in question?