Synchronizing your Computer's Clock with Penn's Network Time Server
in Mac OS X
To synchronize your computer's clock with Penn's network
time server
Kerberos requires that your Macintosh clock be in sync with that
of the Kerberos KDC (ticket-dispensing) server. You can synchronize
your computer's clock with Penn's network time server to ensure
that your computer's date and time remain consistent with that of
the Kerberos server.
-
From the Apple Menu, open the System Preferences window.
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Click the Date & Time icon in the System section
of the window.
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In the Date & Time window, click the Network Time
tab.
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Click to activate the Use a network time server checkbox,
if not already checked.
-
In the "NTP Server" field, type "timeserver1.upenn.edu",
then click the Set Time Now button.
After you click the button, a status message will appear:
-
"Synchronization Succeeded"
-
"Synchronization Failed. Your NTP Server may
not be responding."
If you receive this message, you may wish to check your
spelling in the "NTP Server" field, or select
a different Penn network time server. After adjusting your
server settings, click the "Set Time Now" button
again.
- Optional: To freeze your settings, click the lock icon
in the lower left corner, captioned as "Click the lock to
prevent further changes."
- Close the Date & Time window.
Note: Penn has 3 time servers. You can use any of these
servers to synchronize time. Below is a list of the Penn time
servers:
- timeserver1.upenn.edu
- timeserver2.upenn.edu
- timeserver3.upenn.edu
To select the proper local time zone for your computer:
Once you have synchronized your computer's clock, if it still differs
widely from your local time, check to determine whether you have
set the time zone correctly.
-
From the Apple Menu, open the System Preferences window.
-
Click the Date & Time icon in the System section
of the window.
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In the Date & Time window, click the Time Zone tab.
-
As noted above the world map, "Click your part
of the world and then choose a time zone
from the pop-up menu."
For example, users in Philadelphia would click the eastern region
of the United States, then select "U.S.A.-Eastern"
from the resulting pop-up menu.
-
Close the Date & Time window.
To change the local time zone:
If you have transported your computer to another time zone and
want to display the new local time, you must change the time zone
designation, not the time display itself, in order to maintain proper
synchronization with the network time server.
Note: Do not attempt to manually adjust either
the Current Date or Current Time
fields. They will be automatically and correctly reset by steps
below.
If you have already chosen to synchronize with a network time
server, the system will bar you from resetting the date or time
by hand.
-
From the Apple Menu, open the System Preferences window.
-
Click the Date & Time icon in the System section
of the window.
-
In the Date & Time window, click the Time Zone tab.
-
As noted above the world map, "Click your part
of the world and then choose a time zone
from the pop-up menu."
For example, users in Liverpool, England would click "United
Kingdom" from the resulting pop-up menu.
-
Close the Date & Time window.
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