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asa5505 how to ntp sync external md5 clock

Last Modified: 2016-04-03
hi this is the website I have been looking at:  

- http://support.ntp.org/bin/view/Servers/WebHome

i was advised but given as an example the following address: in order to sync via my asa5505 which is now successful but now I wish to configure for authentication as below:

- ive configured the following via my asa5505 asdm ver 7.1 and ive currently added the following but it shows that ntp has changed from synchronized to now unsynchronized.

- interface: outside
- preferred - yes
- key: no 1
- key value: 23 for example
- trusted key: yes

asa config shows:

ntp authentication-key 1 md5
ntp authenticate
ntp trusted-key 1ntp server key 1 source outside prefer
my asa now shows: "outside: authentication failed for packet from

question 1.  how do I resolve my issue  ?
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Gary Patterson, CISSPExpert for hire: IBM i, AIX, Linux, Windows, DB2, Performance, Security. EDI
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