Have previously used SSH to inspect CircleCI build workers. Went to do the same recently and was unable to get it to work. Went through this guide. Though the guide is 1.0, am not seeing a 2.0 guide for the same. Able to SSH to GitHub no problem. However seeing ssh_exchange_identification: read: Operation timed out when trying to do the same with CircleCI. Any ideas?
What OS are you using to SSH from? I wonder if you are using an old version of SSH that will be refused by the server.
Can you ping the server IP?
On macOS 10.11 using OpenSSH_6.9p1, LibreSSL 2.1.8. I can ping Google.
Can you ping the server IP from your local machine? 
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