Fixed Permission denied (publickey,gssapi-with-mic

If you have some problems likes Permission denied (publickey,gssapi-with-mic), or the error 'Not a RSA1 key file' when using ssh remote login, try to fix issues as below:

1. get more information with ssh -vvv [e-mail], it's more important.
2. check the permissions of your private and public keys, id_rsa should 600, id_rsa.pub should 644
3. check if your id_rsa matched with id_rsa.pub.

For the 3rd, it looks very strange, I am not sure it's a bug of openssh or something. The id_rsa.pub is the public key for my windows host (I have ssh server on windows), the id_rsa is the private key for remote linux host, I put them to the .ssh folder.

But when I ssh login the linux host, I got "Permission denied (publickey,gssapi-with-mic)". if I remove id_rsa.pub from .ssh folder, it work fine.