1/ Clicking on the remote admin link hangs indefinitely (partial progress bar on browser)
2/ Dashboard cloud link is inaccessible
3/ Alexa integration broken; once I select the hub on Alexa hubitat skill after login it error out after a few minutes
All of these symptoms are indicative of a Hubitat Hub that is no longer connected to the Hubitat cloud. Have you tried simply rebooting the Hubitat hub from its Settings menu? Have there been any recent changes to your home network configuration that might be blocking the HE hub from reaching the Hubitat Cloud Servers?
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I have tried rebooting. No changes to network settings.
What model of hub are you using? Have you tried go into the hub's built-in Network Tools to try to PING a server on the Internet?
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Network is not a problem; I can ping public IPs.
The issue seems to be specific to this hub. I have two C-8s; the other one seems to be working fine.
I got "Your session has expired" message in one of the remoteadmin calls to the faulty hub.
Is there a way support staff can look at the server side logs? I am not getting anything on the logs on the hub itself
It seems to have auto resolved now after 12 hrs. Very strange indeed.
FYI - pinging an IP address is not a good test of satisfactory network functioning.
Usually, the issue that causes the symptoms you described is a lack of DNS access (i.e. the hub is unable to resolve CNAMEs to IP addresses).
Testing for DNS function is likely why @ogiewon suggested you ping a server on the internet, as opposed to pinging that server's IP address.
If this situation recurs, see if you can ping "www.hubitat.com" from your Hubitat.
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Networking is never straightforward and without a terminal access with a full suite of tools it is that much harder to debug. It's entirely possible that the hub had cached the resolved IP of some failed over aws host which cleared out after some timeout. FWIW, the public IP I had tried pinging was 8.8.8.8 
. But the system is so opaque that it's nearly impossible to debug and the absence of any logging for this makes it that much harder to understand what's going on
In any case, thanks for the pointer to the (well hidden) ping tool. I was about to roll out a custom app to run pings.
FWIW, there are some serious issues with the whole remote admin setup. my.hubitat.com was showing some random hub as a registered hub with me and I could access the remote admin page of it; most likely a hub I had returned at some point
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