The blue LED indicates that hub platform isn't loaded. There used to be a way for the enduser to load the platform. But I think it was removed at some point of time.
What do you think about my suggestion to try loading a previous version?
Brand new hub. No previous version 
Oh well! It was worth a shot! I assumed it would check the web for the previous version and download and install as needed... kind of like a Mac does. I guess it just restores from a locally kept copy. Learn something new every day 
I had similar experiences and forcing the port to 100 FDX on my switch solved my issue (even though it auto-negotiated at that) DHCP Handshake won't complete
Thanks, but I’m using un-managed switches, I don’t have an option to set port/switch negotiation rates.
@bobbyD I was told on reddit to @ you. I submitted a ticket last week and have been updating with new information as i have tried things, but have not had any response aside from the initial one. can this be looked into?
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Please see my private message.
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mine did the same thing did you find a fix to this?
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I’m stuck here too. Just emailed support and waiting on a response.
Jumping in here with what appears to be the same issue. @bobbyD I did submit a support request via email and if there are troubleshooting steps I can try, I am open to try.
Is a brand new Hubitat. Never went past blue. Able to access the dagnostic tool. Otherwise the connection is refused.
Thanks in advance!
My hub was shipped with a defective Ethernet cable, try changing yours out to a known good one.
A bad Ethernet cable wouldn’t produce the blue light, and wouldn’t allow access to the Diagnostic Tool. Sounds more like the hub was shipped with no or bad platform code. Support can handle it.
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Did you register the hub at hubitat.com? Just a thought.
Another thing to try: log in to the Diagnostic Tool using the MAC address on the sticker on the underside of the hub, then Download Latest Version. Then, do a Soft Reset. Because this is a new hub, you shouldn’t have any devices. See if that will boot.
THanks for those suggestions! @672southmain I have been in communication with support and we are working it out.
I did try your suggestions and received errors
I appreciate the ideas and discussion so far. An active community makes a difference!
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Has anyone had issues with messages getting to support? I have been replying to emails and today got a message that they have not received anything and as a result will close the ticket.
It is a strange feeling sending something to the ether and now wondering if you were even heard.
That is very odd. I am checking on your tickets now, to see what happened. Perhaps your emails got caught in our spam for some reason.
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Thanks for reaching out. I guess it's always a first in everything. We've had initial emails routed by accident in the spam, but this is the first time that an address that already had sent one or more emails was marked as spam.
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