git push heroku master results in issues with authenticity and host key failing

Question

I am doing my first push to Heroku and this is what I see

$ git push heroku master
The authenticity of host 'heroku.com (50.19.85.156)' can't be established.
RSA key fingerprint is 8b:48:5e:67:0e:c9:16:47:32:f2:87:0c:1f:c8:60:ad.
Are you sure you want to continue connecting (yes/no)? no
Host key verification failed.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

I have looked at the Heroku doc page https://devcenter.heroku.com/articles/git-repository-ssh-fingerprints and it tells me

Manually verifying

The current Heroku SSH Git fingerprint is 8b:48:5e:67:0e:c9:16:47:32:f2:87:0c:1f:c8:60:ad.

When you first git push heroku master, please manually match the provided SSH key to this fingerprint.

Ok I know what the current SSH Git fingerprint is but I have no idea what the provided SSH key is. Also I have no idea how I would match the two.

Also I tried verifying with DNS. I followed the following in instructions

Verifying with DNS

You can make use of our SSHFP DNS records by adding the following lines to your ~/.ssh/config

Host heroku.com  
  VerifyHostKeyDNS yes

So first I realized there was no config file in my ~/.ssh/ directory. So I made the config file and added the two lines. Then when I tried to push again this is what I saw

$ git push heroku master
Bad owner or permissions on /home/max/.ssh/config
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

Any ideas on how to solve this?

Answer 1

On your initial push to heroku, when you are prompted to continue connecting: Are you sure you want to continue connecting (yes/no)? you need to select yes. The "provided" SSH key is the RSA fingerprint outputted in your shell prompt. Note that it matches the Heroku SSH Git fingerprint listed on the doc page.