Okay so here's what I found in Aurora's debug log:
{ "time" : "17:00:29.456", "thread" : "0xF9000004", "type" : "info", "filter" : "NTPClient", "message" : "Begin NTP thread work." }
{ "time" : "17:00:29.457", "thread" : "0xF9000004", "type" : "info", "filter" : "NTPClient", "message" : "Current System Time: Nov 22, 2005 17:00:29 UTC" }
{ "time" : "17:00:29.457", "thread" : "0xF9000004", "type" : "info", "filter" : "NTPClient", "message" : "Resolving server (pool.ntp.org) IP Address... " }
{ "time" : "17:00:29.462", "thread" : "0xF9000004", "type" : "error", "filter" : "NTPClient", "message" : "An error occurred during DNS Lookup. (Err: 11001)" }
And the retry log:
{ "time" : "17:00:44.626", "thread" : "0xF9000004", "type" : "info", "filter" : "NTPClient", "message" : "Retrying connection to NTP servers...#3" }
{ "time" : "17:00:44.627", "thread" : "0xF9000004", "type" : "info", "filter" : "NTPClient", "message" : "Current System Time: Nov 22, 2005 17:00:44 UTC" }
{ "time" : "17:00:44.627", "thread" : "0xF9000004", "type" : "info", "filter" : "NTPClient", "message" : "Resolving server (pool.ntp.org) IP Address... " }
{ "time" : "17:00:44.633", "thread" : "0xF9000004", "type" : "error", "filter" : "NTPClient", "message" : "An error occurred during DNS Lookup. (Err: 11001)" }
{ "time" : "17:00:44.634", "thread" : "0xF9000004", "type" : "info", "filter" : "NTPClient", "message" : "Completed NTP thread work." }
{ "time" : "17:00:44.635", "thread" : "0xF9000004", "type" : "info", "filter" : "NTPClient", "message" : "NTP time sync failed." }
So the culprit is pool.ntp.org. The website is not reachable.