Synchronized time is critical in Windows 2000 as the workstation uses time as part of the Kerberos authentication ticket generation process.
Here is a collection of informational, warning, and error messages issued by the W32time service?
MessageId=0x0 Severity=Informational SymbolicName=MSG_TIMESET_SMALL Language=English Time set (offset < .5 second) MessageId=0x1 Severity=Informational SymbolicName=MSG_TIMESOURCE Language=English Registry LanmanServer\Parameters\timesource is not set, maybe it should be set MessageId=0x2 Severity=Informational SymbolicName=MSG_CHANGE Language=English Changing TimeAdjustment from default increment (to compensate for skew) MessageId=0x5 Severity=Informational SymbolicName=MSG_LEAP Language=English A leap second seemed to be inserted within the last 24 hours MessageId=0x06 Severity=Informational SymbolicName=MSG_TIMESET_LARGE Language=English Time set (offset > .5 second) MessageId=0x07 Severity=Informational SymbolicName=MSG_TOO_MUCH_SKEW Language=English Skew > 15 seconds per day, compensation not attempted MessageId=0x0b Severity=Warning SymbolicName=MSG_NTPTROUBLE Language=English The NTP server %1 didn't respond MessageId=0x0c Severity=Warning SymbolicName=MSG_NTPBAD Language=English The NTP server %1 isn't sync'd, time not set MessageId=0x0e Severity=Warning SymbolicName=MSG_TOOBIG Language=English Attempt to set time which differs by more than 12 hours aborted MessageId=0x19 Severity=Warning SymbolicName=MSG_LONG_TIME Language=English It has been over 24 hours since we received a network success MessageId=0x1a Severity=Warning SymbolicName=MSG_NO_DELAY Language=English Couldn't measure the line delay (accuracy is reduced) MessageId=0x1c Severity=Warning SymbolicName=MSG_DELAY_FAIL Language=English Difficulty measuring network delay, check the link to your server(s) MessageId=0x1f Severity=Warning SymbolicName=MSG_TOOEARLY Language=English Attempt to set date prior to 1995 aborted MessageId=0x20 Severity=Error SymbolicName=MSG_EVENT_KEY Language=English Could not create EventLog registry key (higher privilege needed?) MessageId=0x21 Severity=Error SymbolicName=MSG_EVENT_MSG Language=English Could not set event message file MessageId=0x22 Severity=Error SymbolicName=MSG_EVENT_TYPES Language=English Could not set supported event types MessageId=0x23 Severity=Error SymbolicName=MSG_SCM_FAILED Language=English OpenSCManager failed MessageId=0x24 Severity=Error SymbolicName=MSG_CS_FAILED Language=English CreateService failed MessageId=0x25 Severity=Error SymbolicName=MSG_OPT_FAILED Language=English OpenProcessToken failed MessageId=0x26 Severity=Error SymbolicName=MSG_ATPE_FAILED Language=English AdjustTokenPrivileges enable failed (higher privilege needed) MessageId=0x27 Severity=Error SymbolicName=MSG_ATPD_FAILED Language=English AdjustTokenPrivileges disable failed MessageId=0x2d Severity=Error SymbolicName=MSG_SLT_FAILED Language=English SetLocalTime failed MessageId=0x2e Severity=Error SymbolicName=MSG_SST_FAILED Language=English SetSystemTime failed MessageId=0x30 Severity=Error SymbolicName=MSG_SSS_FAILED Language=English SetServiceStatus failed MessageId=0x32 Severity=Error SymbolicName=MSG_WNOE_FAILED Language=English WNetOpenEnum failed MessageId=0x33 Severity=Error SymbolicName=MSG_SOCKET_FAILED Language=English Invalid socket (TCP/IP might not be loaded) MessageId=0x34 Severity=Error SymbolicName=MSG_NTP_NAME Language=English gethostbyname failed for server %1 (NTP or USNO) MessageId=0x35 Severity=Error SymbolicName=MSG_BAD_SIGNATURE Language=English NTP server %1 (%2) returned an incorrectly signed time stamp. MessageId=0x36 Severity=Error SymbolicName=MSG_NO_DC_LOCATED Language=English The Windows Time Service was not able to find a Domain Controller. A time and date update was not possible. MessageId=0x37 Severity=Informational SymbolicName=MSG_NEW_DC_LOCATED Language=English New DomainController time source is %1 (%2) located in %3 MessageId=0x38 Severity=Error SymbolicName=MSG_BAD_DC_SIGNATURE Language=English The Domain Controller %1 (%2) in %3 returned an incorrectly signed time stamp. If this DC is from the machine's parent domain then the trust link between the domains may be broken and must be fixed. If the DC is from this machine's own domain, then the machine password for this machine is incorrect and should be corrected. MessageId=0x39 Severity=Error SymbolicName=MSG_NODLL_IN_REGISTRY Language=English Service configuration is for a third-party DLL but the DLL name is not in the registry. MessageId=0x3a Severity=Error SymbolicName=MSG_DLL_LOAD_FAILED Language=English The DLL for time sync does not have the proper entry point. MessageId=0x3b Severity=Warning SymbolicName=MSG_NO_XSUM Language=English The NetLogonComputeServerDigest call returned an error. This is an internal failure but it will prevent this machine from providing correctly signed time. MessageId=0x3c Severity=Warning SymbolicName=MSG_NTPNOXSUM Language=English The NTP time source %1 (%2) returned an unsigned time stamp. This likely means that the server experienced an internal failure. Please check the event log on that server.