Thanks, Joe! Anything you find would be of help. I've recreated API keys and checked firewalls, ect... but nothing.I have seen this a few times in the past. I can't for the life of me remember what caused it but you're not alone with this issue. I'll try to dig through my notes to find you more info for it.
The only difference is the lack of a u/n prefix which I doubt is the catalyst. Is it happening with the same package on multiple nodes, or is this a single node having problems? Anything in the logs to give us a hint? Any recent updates run? As far as the node side is concerned I'd be glad to act as a second pair of eyes if needed...