Consider the following commands. How can this happen?

```
[root@mylocal ~]# ssh myuser@myhost
Permission denied (publickey,gssapi-keyex,gssapi-with-mic).
[root@mylocal ~]# su myuser
[myuser@mylocal ~]$ ssh myhost
Welcome Last login: Sat Oct 20 16:28:48 2018 from mylocal 
[myuser@myhost~]$ 

```

please advise how to cure it so that I can do as root, 

```
[root@mylocal ~]# ssh myuser@myhost   
Welcome Last login: Sat Oct 20 16:28:48 2018 from mylocal 
[myuser@myhost~]$

```

thanks