The following severities are used in SNA Server:
| 6 | Detailed problem analysis data |
| 8 | General information messages |
| 10 | Significant system events |
| 12 | Warnings/recoverable errors |
| 16 | Fatal errors |
All logs are placed in the Windows NT Application event log. The default level of audit logs can be specified when configuring SNA Server, so that all or some of the audit logs can be suppressed and lower-level messages can be filtered out when viewing log files using the Windows NT Event Viewer program.
Note that level 16 errors are always taken to be fatal errors; an application that logs a level 16 error will be terminated automatically. In particular, the call to the logging routine will not return; the application should perform all required cleanup processing, including any lower-level logs, before logging the fatal error.