/usr/bin/ktutil
addent -password -p acoder@EXAMPLE.COM -k 1 -e rc4-hmac
addent -password -p acoder@EXAMPLE.COM -k 1 -e aes256-cts
wkt /etc/krb5.keytab

[acoder@clientbox]# klist -kte
Keytab name: FILE:/etc/krb5.keytab
KVNO Timestamp         Principal
---- ----------------- --------------------------------------------------------
   1 09/16/15 16:24:32 acoder@EXAMPLE.COM (arcfour-hmac)
   1 09/16/15 16:25:46 acoder@EXAMPLE.COM (aes256-cts-hmac-sha1-96)

#OP TYPE    DESCRIPTION CALLOUT INFO    PROGRAM ARG1 ARG2 ARG3 ...
#====== ======= =============== =============== ===============================
create  user        debug:*     negate      /bin/keyctl negate %k 30 %S
create  user        debug:loop:*    *       |/bin/cat
create  user        debug:*     *       /usr/share/keyutils/request-key-debug.sh %k %d %c %S
negate  *       *       *       /bin/keyctl negate %k 30 %S
create  cifs.spnego     *       *       /usr/sbin/cifs.upcall %k
create  dns_resolver    *       *       /usr/sbin/cifs.upcall %k

# klist | grep "Ticket cache:"
Ticket cache: FILE:/tmp/krb5cc_0

mount error(126): Required key not available
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

Sep 16 16:33:44 clientbox kernel: CIFS VFS: Error -2 during NTLM authentication
Sep 16 16:33:44 clientbox kernel: CIFS VFS: Send error in SessSetup = -2
Sep 16 16:33:44 clientbox kernel: CIFS VFS: cifs_mount failed w/return code = -2
Sep 16 16:33:49 clientbox kernel: CIFS VFS: Send error in SessSetup = -126
Sep 16 16:33:49 clientbox kernel: CIFS VFS: cifs_mount failed w/return code = -126