Where are the SharePoint ULS Logs?

If you are looking for the SharePoint ULS Logs,  the default path log locations are below:

For SharePoint 2010:
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\Logs

For SharePoint 2013:
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\15\Logs

Optionally, if you wish to change the location of the ULS logs, you can do so in Central Administration:

1. In Central Administration, click on Monitoring
2. You can then click on "Configure diagnostic logging" to alter the path to the diagnostic Trace Logs
3. To alter the usage logs, you can click on "Configure usage and health data collection" and alter the path for the logs under Usage Data collection Settings.

Now, if you wish to view and actually MAKE SENSE of the ULS Logs, then you will want to use one of the various ULS Log Viewers that are available for download:

http://ulsviewer.codeplex.com/

http://sharepointlogviewer.codeplex.com/

http://archive.msdn.microsoft.com/ULSViewer/


The ULS Log Viewer that you choose is largely a matter of personal preference, but it seems that the CodePlex projects seem to provide more functionality than the ULS Log Viewer provided on the MSDN Code site.

If you need to view ULS Logs from a SharePoint 2013 installation, ONLY the http://sharepointlogviewer.codeplex.com/ project provides SharePoint 2013 support.

UPDATE: Microsoft is now providing an updated version of the ULS Log Viewer for SharePoint 2013!!  http://www.microsoft.com/en-us/download/details.aspx?id=44020