Impossible to open file <<smb://<host>/<share>/<file-path>> Unexpected error: Function not implemented

root@UL30AL64:/home/fmoli# mount.cifs //<host>/<myshare> /media/gw-fm -o user=<myname>,password=<mypwd>,nounix,noserverino,sec=krb5
mount error(126): Required key not available
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

mount.cifs //192.168.0.x/public /mnt/public -o user=myusername,password=mypassword,nounix,sec=ntlmssp,noperm,rw

//192.168.0.x/public    /mnt/public    cifs    credentials=/root/.credentialsfile,iocharset=utf8,nounix,sec=ntlmssp,noperm,rw

username=myusername
password=mypassword