ssh: Could not resolve hostname [hostname]: nodename nor servname provided, or not known

Question

I am trying to set up a VPN with a Raspberry Pi, and the first step is gaining the ability to ssh into the device from outside my local network. For whatever re

Answer 1

If you're on Mac, restarting the DNS responder fixed the issue for me.

sudo killall -HUP mDNSResponder

Answer 2

In my case I was trying ssh like this

ssh pedro@192.168.2.179:22 

when the correct format is:

ssh pedro@192.168.2.179 -p 22 

Answer 3

Try this, considering your allowed ports. Store your .pem file in your Documents folder for instance.

To gain access to it now all you have to do is cd [directory], which moves you to the directory of the allotted file. You can first type ls, to list the directory contents you are currently in:

ls
cd /Documents
chmod 400 mycertificate.pem
ssh -i "mycertificate.pem" ec2-user@ec2-1-2-3-4.us-compass-0.compute.amazonaws.com -p 80