Why are non windows ntp clients not updating from a windows ntp server?
Posted on 2014-08-19
Our non windows ntp clients are not receiving time updates. Why?
MAINT2 is our NTP server. It is a Windows 2003 which reaches out to time.windows.com for the time.
Our PDC gets the time from MAINT2. All other domain desktops and servers get their time from our PDC. This portion works as expected.
All NON Windows equipment is pointed to MAINT2 for the time. Non Windows equipment includes printers, VOIP phones, network equipment etc.
The non Windows equipment is not receiving updates. It did work at one time until we realized MAINT2 was not actually reaching the Internet for the time due to a firewall issue. Since we corrected MAINT2 being able to reach the time server on the Internet the non Windows clients are not getting time updates.
Using WireShark we can see the one way conversation between a phone and MAINT2. The phone makes a time request but MAINT2 does not reply back.
We've tried every idea we have come across but still no luck. Any ideas? Is there some kind of authentication getting in the way?