This article was previously published under Q232243
A new tool, Uptime.exe, is available for displaying system availability. Uptime.exe can be used to display the current uptime of the local or remote system. Optionally, it can also scan the Event log for key system events such as system restart or computers that are not responding (hanging). Where possible, it also calculates system availability. It is primarily intended for Windows NT Server 4.0 Service Pack 4 or later, though it operates in limited fashion on earlier versions.
Uptime.exe is a standalone program. To install the tool, simply copy the file into your Windows NT directory. You may then run the tool at a command prompt.
For extended help on this tool, type the following at a command prompt:
This tool is most accurate when run with administrator privileges, however, even without administrator privileges, the tool attempts to make a best estimate based on available information. In all cases, the results should be considered estimates.
It is important to note that the uptime and availability measurements reflect the local view of the operating system only. The "Total Uptime" measurement refers to the sum of all the time during the measured period where the operating system reported itself to be in normal operation. It does not reflect times when the server might be unavailable for other reasons, such at network outages.
It is also important to note that although the operating system is functioning normally, this does not mean that the server programs running on that server are operating normally. For instance, the operating system may be available, but a database running on that server may not be operating correctly.
Uptime depends on the Event log for the data it uses to calculate availability. The tool is not able to make calculations prior to the beginning of the Event log. If the Event log is cleared, no calculations are possible. Certain settings can be disabled limiting the accuracy of this tool. For example, writing an event when the system stops responding and displays a blue screen error message or disabling Dr. Watson for program error messages. Please see the following article in the Microsoft Knowledge Base for information on blue screen error messages:
192463 Gathering Blue Screen Information After Memory Dump
Please see the following articles in the Microsoft Knowledge Base for information on Dr. Watson and application errors:
Uptime is only able to calculate availability when using Windows NT 4.0 Service Pack 4 or later. Service Pack 4 introduced a "heartbeat" (as described in the Uptime Help file), and additional events for tracking system shutdowns. For more information about these events, please see the following article in the Microsoft Knowledge Base:
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.