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ntpdate fails to synchronise with a Cisco router with "no server suitable for synchronization found"


When configuring ntp on an ESX host the time synchronisation fails when the ntp init script is run:

# /etc/init.d/ntpd start
ntpd: Synchronizing with time server:                      [FAILED]
Starting ntpd:                                             [  OK  ]

When querying with ntpdate the following error is reported:

# ntpdate -q
server, stratum 16, offset -19.643999, delay 0.02718
13 Jul 09:58:34 ntpdate[5415]: no server suitable for synchronization found

The Cisco router has the following ntp config:

ntp server

The Cisco reports its status as:

# show ntp status
Clock is unsynchronized, stratum 16, no reference clock


The Cisco router is not correctly synchronising with an upstream time source.

Add the ntp source command to resolve the issue:

ntp source Ethernet0/0



VMware ESX 3
Cisco Router (any)

Created: 17th July 2007
Updated: 17th July 2007

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