My application uses log4net, which writes to a file. It works fine under development, and under IIS on a Win7 machine. Once deployed to my DASP site however, it never writes. Am I missing a configuration or a permission setting? I'm writing to the App_Data folder, as the app should have write permissions there by default. If I need to set custom permissions, can you please explain how I do it in the DASP interface or otherwise. Any other tips on how to investigate the issue would be appreciated. Below are the pertinent parts of my web.config file. Code: <log4net> <appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender"> <file value="App_Data/Appliction.log"/> <appendToFile value="true"/> <rollingStyle value="Size"/> <maxSizeRollBackups value="10"/> <maximumFileSize value="100KB"/> <staticLogFileName value="true"/> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline"/> </layout> </appender> <root> <level value="ALL"/> <appender-ref ref="RollingFileAppender"/> </root> </log4net>