C8 Pro - green light but not reachable

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1

Hi all,

The hub was working fine, but this morning is not reachable. Initially the red LED was blinking indicating a network issue. So I did the following:
-changed port on the hub
-pushed the reset button on the hub
Hub came back up with solid green LED. However, the hub is not reachable and is not found by the utilities. It is not responding on port 8081.

The hub has a fixed IP and it can be seen as connected on the router.
Link lights on the hub are active.
The hub is not responding to pings from windows CMD to its IP address.
The hub is not responding on either the app or the browser.

So hub 'thinks' it is up - but not responding.

Any suggestions? Pull the plug and wait for 10 secs and plug back in?

2

Update: I tried pulling the plug, wait 30 sec, plug back in - same state as previously.
In "Advanced find", the hub is located with the MAC address, however, when you click on 'go to hub' nothing happens - because the hub is not responding to the IP address.

I guess a reboot to factory settings is next step?

3

Pulling the plug without shutting down gracefully is not recommended as it can cause corruption in the database (and other problems?), so whenever you can I would suggest avoiding that in the future.

Beyond that.... Try to hold fire for now if you can.... If nothing else diagnosing a problem with your hub may help others in the future, but more importantly for you it may help avoid a more involved effort to get you back up and running (as much as it can be easy enough with a hub backup).

Give it 24 hours if you can to see what assistance you receive.

4

Generally what has happened in these instances is that your hub has changed IP addresses. From a command prompt on your PC try typing arp -a and hit enter. This should bring up a list of MACs and associated IP addresses. Your hub MAC should be in that list.

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5

currently the MAC address is not returned in the list.

The C8 LED is green, and connected to a hub with active link lights. The router now shows the C8 as offline.

As an aside. The C8 had a fixed IP on the hub associated with its MAC address - so should not have been able to change its IP address?

6

Could you try a different ethernet cable?

Others can comment on this with more authority than me.... Like any networking topic :slight_smile: But I believe a static IP on a device does not guarantee a reservation....

7

When you pressed the network reset button how long did you hold it? (Needs to be minimum 7 seconds)

Is the hub connected directly to your router?

In your router set up a DHCP reservation for the hub, then do the network reset and see if that works.

Download and run advanced port scanner to see if you can see the hub.

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8

:point_up: :point_up: Probably something he said....

9

changed LAN cable. Held reset button down for 20 secs and released.
Solid green LED, active link lights.

Port scanner does not find C8, and router indicates mac address is offline.

So I think the green LED is misleading?

The hub is connected to the router. There is one subnet only on the LAN. This configuration was working fine yesterday. No idea what has caused the problem - as there are no problems with any other devices on the network.

10

I'm stretching my memory, without reading the doco to confirm, but I believe the green light is more an indicator for whether the underlying OS is up and running, possibly even the HE "app" running on the hub. Green is normally good, as far as I understand. But the port scanner doesn't care about that.... Hmmm...

Have you checked port 8081 again? I know, not a likely solution... Or something that would work...

My best guess would be to work through (with other people if I'm honest) some of the recent network issues that have been resolved or are in play.

I've likely missed a mention of this, but are you running the latest platform version? Or at least, what version are you running?

11

The C8 is not responding to the IP address, so I can't get to port 8081. The c8 was registered - and according to 'My Hubitat' the hub was/is running * Platform version:

2.3.9.193

12

Yep, I'm not your guy.,... I'll only add to the confusion for why things are not working like they should... good luck :slight_smile: I hope the smarter people here can chime in soon and get you back up and running....

I do feel like it will be one for @bobbyD in the end... Sorry to other support people who I temporarily spammed....

13

Thank you for your assistance. We need to eliminate the other options/possibilities. I greatly appreciate the prompt replies.

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14

Have you released the IP address on your router and rebooted your network gear after resetting the hub's network settings? I would let your DHCP server assign a new IP to the hub and go from there.

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15

:slight_smile:

16

OK. It was the hub that was causing the issue. I plugged directly into the router, and all was working fine, so I faffed around with the hub and I can now reach the C8.

Thank you all for your assistance.

17

What was it plugged into before?

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18

it was always plugged into the network hub, but something had changed on the hub causing constant collisions. Once that was sorted, the C8 (and everything else on the hub) was reachable.

What is the preferred way of fixing the IP - in the network settings on the C8 - or as a reservation in the DHCP table on the router - or both?

19

DHCP reservation on the router is cleaner and less prone to misconfiguration.

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