So I have a centos 7 server with 2 users.
User1 has the
~/.ssh/authorized_keys file with proper permissions and with externaluser's public key in it.
User2 has the
~/.ssh/authorized_keys file with proper permissions and with the same externaluser's public key in it.
Externaluser can ssh to User1 with no problems, however, he gets
Permission denied (publickey,gssapi-keyex,gssapi-with-mic) error when trying to ssh to User2.
Why does this happen? It's literally the same public key, properly pasted into the
authorized_keys file of each user, using the same method.
ssh -vfor more detailed information about what's happening and add it to your question.