In the recent weeks I've noticed each morning that my clock would be behind by 2-3 minutes. I've noticed that opening the 'Date & Time' dialog from System Preferences will trigger the clock to resynchronize to Apple's time servers. I am running OS X 10.7.4 Lion on an 8,2 MacBook Pro.
What might be causing this lack of automatic resynchronization?
EDIT: I compared my
/etc/ntp.conf file to a peer's also running Lion, and we noticed that my file contained:
0000000: 7365 7276 6572 2074 696d 652e 6170 706c server time.appl 0000010: 652e 636f 6d2e 0a e.com..
while his had:
0000000: 7365 7276 6572 2074 696d 652e 6170 706c server time.appl 0000010: 652e 636f 6d e.com
His last modification date on the was mid-2010, while mine was last modified only a week or two ago (around when the issue started?). I certainly did not manually edit the file. Possibly related?
EDIT 2: I noticed that, if I change my time server in 'Date & Time' to, say, Asia, my
/etc/ntp.conf file becomes:
0000000: 7365 7276 6572 2074 696d 652e 6173 6961 server time.asia 0000010: 2e61 7070 6c65 2e63 6f6d 2e0a .apple.com..
complete with trailing 0x2e character. So, it seems that OS X adds the trailing . automatically, but a fresh Lion system does not contain this trailing character. Still unsure whether this is affecting the synchronization though.
EDIT 3: It's been 24 hours since I changed the time server to 'Apple Asia' and then back to 'Apple Americas' -- no time drift. Bizarre.