# Can't connect to cloud - flashing cyan

**URL:** <https://community.particle.io/t/cant-connect-to-cloud-flashing-cyan/1109>\
**Category:** Troubleshooting\
**Created:** [December 31, 2013, 2:21am UTC](https://community.particle.io/t/cant-connect-to-cloud-flashing-cyan/1109 "2013-12-31T02:21:10Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![Dave](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/dave/32/181_2.png) [@Dave](https://community.particle.io/u/Dave)\
**Post date:** [December 31, 2013, 11:15pm UTC](https://community.particle.io/t/cant-connect-to-cloud-flashing-cyan/1109/11 "2013-12-31T23:15:59Z")

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Just jumping in here, but I think fast flashing cyan usually indicates problems with the public server key on the core. Flashing orange (yellow/red) indicates problems with the core-key I believe. If it’s the server public key, then we need to re-write that key to the core.

dfu-util -d 1d50:607f -a 1 -s 0x00001000 -v -D cloud\_public.der

You can grab that key here:  
[https://s3.amazonaws.com/spark-website/cloud\_public.der](https://s3.amazonaws.com/spark-website/cloud_public.der)

Instructions for updating private keys here:

> **[Troubleshooting: My Core is flashing yellow/red lights after it connects to wifi](https://community.particle.io/t/troubleshooting-my-core-is-flashing-yellow-red-lights-after-it-connects-to-wifi/627)**
>
> Hey Guys! In case anyone is having trouble connecting to the cloud and you see this problem, and it doesn’t go away after a few minutes, please reach out to us at hello@particle.io. I will be releasing a fix for this soon. Thanks! David

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