# Failed to claim core, Device is not connected

**URL:** <https://community.particle.io/t/failed-to-claim-core-device-is-not-connected/7587>\
**Category:** Troubleshooting\
**Created:** [October 20, 2014, 3:15am UTC](https://community.particle.io/t/failed-to-claim-core-device-is-not-connected/7587 "2014-10-20T03:15:50Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![mediabeastnz](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/mediabeastnz/32/3347_2.png) [@mediabeastnz](https://community.particle.io/u/mediabeastnz)\
**Post date:** [October 20, 2014, 3:15am UTC](https://community.particle.io/t/failed-to-claim-core-device-is-not-connected/7587/1 "2014-10-20T03:15:50Z")

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Been trying and trying to get this thing to work but i’m running out of ideas…

I’ve flashed on the latest updates e.g. cc3000… it’s breathing/pulsing cyan so i’m guessing it’s connected.

Whenever i try to add a core it says the device is not connected 😕

Also when i run “spark serial identify” i get the following error:  
Something went wrong Serial timed out  
Potentially unhandled rejection [4] Serial timed out (WARNING: non-Error used)

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**Author:** ![kennethlimcp](https://avatars.discourse-cdn.com/v4/letter/k/c0e974/32.png) [@kennethlimcp](https://community.particle.io/u/kennethlimcp)\
**Post date:** [October 20, 2014, 4:21am UTC](https://community.particle.io/t/failed-to-claim-core-device-is-not-connected/7587/2 "2014-10-20T04:21:08Z")

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Pulsing cyan means it’s trying to connect to the ☁ but not succeeding yet.

Which security type is your network on?

Try connecting to your mobile hotspot and see if it connects well?

`spark identify` only works in Listening mode (blinking blue) and it’s for you to check on the core id.

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<div class="post-metadata">

**Author:** ![mediabeastnz](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/mediabeastnz/32/3347_2.png) [@mediabeastnz](https://community.particle.io/u/mediabeastnz)\
**Post date:** [October 20, 2014, 10:30pm UTC](https://community.particle.io/t/failed-to-claim-core-device-is-not-connected/7587/3 "2014-10-20T22:30:22Z")

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The network in WPA2 i’m pretty sure. I’ve also tried it on other routers and security types. Turned of firewalls.

I did try my iPhone hotspot and that worked so it must be something to do with distance potentially??

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<div class="post-metadata">

**Author:** ![kennethlimcp](https://avatars.discourse-cdn.com/v4/letter/k/c0e974/32.png) [@kennethlimcp](https://community.particle.io/u/kennethlimcp)\
**Post date:** [October 20, 2014, 10:33pm UTC](https://community.particle.io/t/failed-to-claim-core-device-is-not-connected/7587/4 "2014-10-20T22:33:01Z")

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If it turned blinking cyan means it connected to the network but not to the ☁ so distance is fine here.

Also, if it works with a hotspot, there might be some issue with the network configuration.

Are you on 5Ghz channel? Is the channel 11 and below?

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<div class="post-metadata">

**Author:** ![zach](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/zach/32/20714_2.png) [@zach](https://community.particle.io/u/zach)\
**Post date:** [October 21, 2014, 12:14am UTC](https://community.particle.io/t/failed-to-claim-core-device-is-not-connected/7587/5 "2014-10-21T00:14:30Z")

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actually it sounds like it did connect to the cloud - he said breathing/pulsing, which means that the cloud connection was complete.

sounds like you just need to claim your core, but you’re not able to get `spark serial` working. Do you have any other serial terminal tools on your computer? You can use the Arduino IDE, or GNU screen, or PuTTY on a PC, or CoolTerm on a Mac. Then open a serial connection to the Core (over USB) at 9600 baud, and then type `i`, which should return the device’s ID, which you can then claim from the web IDE