IIS Log File May Be Truncated When Logging to Text File

The information in this article applies to:

• Microsoft Internet Information Server version 3.0

SYMPTOMS

When you set Internet Information Server (IIS) to log to a text file, and you select Automatically Open New File Daily, Weekly, or Monthly, the current log file may still become truncated. As a result, further logging will be directed to the Inetsvn.log file.

WORKAROUND

Use one of the following methods:

First Method

WARNING: Using Registry Editor incorrectly can cause serious, system-wide problems that may require you to reinstall Windows NT to correct them. Microsoft cannot guarantee that any problems resulting from the use of Registry Editor can be solved. Use this tool at your own risk.

1. Edit Registry for each service.

2. Set Parameters/LogFileTruncateSize to 0xffffffff.

Second Method

1. Force the registry to write correct value into Parameters/LogFileTruncateSize through InetMgr.

2. Change the logging properties by selecting When File Size Reaches option. Edit a new size, and click Apply.

3. Go back to original Open New File Daily option. The behavior will now be correct.

STATUS

Microsoft has confirmed this to be a problem in Microsoft Internet Information Server version 3.0. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

Keywords          : iisgeneral kbusage kbbug
Version           : WinNT:3.0
Platform          : winnt
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbpending