Soufiane Mghanen Soufiane Mghanen - 2 months ago 21
ASP.NET (C#) Question

log4net doesn't create log file when deployed on IIS7

Good morning everybody,

I have a log4net issue that didn't exist when I was developing on my
local machine, but once I deployed the application to a server, log4net stopped working.

This is the server configuration :
-Windows XP SP3
-IIS 7
-framework .Net v4

This is the log4net configuration in the web.config of the website:

<configuration>
<log4net>
<root>
<level value="DEBUG" />
<appender-ref ref="LogFileAppender" />
</root>
<appender name="LogFileAppender" type="log4net.Appender.RollingFileAppender">
<param name="File" value="log.txt" />
<param name="AppendToFile" value="true" />
<rollingStyle value="Size" />
<maxSizeRollBackups value="10" />
<maximumFileSize value="30MB" />
<staticLogFileName value="false" />
<layout type="log4net.Layout.PatternLayout">
<param name="ConversionPattern" value="%-5p%d{yyyy-MM-dd hh:mm:ss} – %m%n" />
</layout>
</appender>
</log4net>
</configuration>


I also have a class library and this is its App.config file:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,Log4net"/>
</configSections>
<log4net>
<root>
<level value="DEBUG" />
<appender-ref ref="LogFileAppender" />
</root>
<appender name="LogFileAppender" type="log4net.Appender.RollingFileAppender" >
<param name="File" value="log.txt" />
<param name="AppendToFile" value="true" />
<rollingStyle value="Size" />
<maxSizeRollBackups value="10" />
<maximumFileSize value="30MB" />
<staticLogFileName value="true" />
<layout type="log4net.Layout.PatternLayout">
<param name="ConversionPattern" value="%-5p%d{yyyy-MM-dd hh:mm:ss} – %m%n" />
</layout>
</appender>
</log4net>
</configuration>


This is how I call the log function on every class:

private static readonly ILog log = LogManager.GetLogger(typeof(AppDomain));


...and this is how i call it :

log.Error("\n\t=>" + ex.GetBaseException().Message + "\n\r" + " @ " + Environment.StackTrace);

Answer

It could be that you do not have permissions to write to the file 'log.txt'.

I don't know what the current directory would be but it's unlikely to be somewhere IIS can write to.

You need to create a folder somewhere and grant access for IIS to write to it, I understand you need to grant access to the IIS_IUSRS group and then specify the absolute path to that file. e.g.

<param name="File" value="D:\Logs\log.txt" />

..using the path to your preferred location.

Comments