Problems getting a neglected spark back online

[dougal]

I dusted off one of my Cores a while back and had all sorts of issues getting it back online. I don't know exactly what sequence of actions eventually fixed it, but I think it involved resetting the keys. Maybe try particle keys doctor?

Edit: Have a look at this thread:

Red LED blinks three times when trying to connect to the wifi network

Hi, I’m getting three LED blinks when trying to connect to the cloud. I could connect my core to the cloud before and then I tried setting up a local cloud server and connecting the core to it. I could successfully fire up the server though when I was trying to connect the core to the local cloud, it didn’t get connected.(Apparently it was a handshake problem which I found out later when checking the server logs.) Then I tried to connect it again to the spark cloud and from that point onwards …