Hello,
I tried to set for my RollingLogFile a custom header. Added only in the head of file, once. My application is installed in a web farm environment and I had issues there. Multiple files were created(I used minimal lock as locking model). Ex: infoFile_2015_09_03.tsv infoFile_2015_09_03.tsv2015_09_03.tsv infoFile_2015_09_03.tsv2015_09_03.tsv2015_09_03.tsv This is my code: /// <summary> /// Custom class for override the log4net Header Writing /// </summary> public class CustomHeaderLogFile : RollingFileAppender { protected override void WriteHeader() { if (LockingModel.AcquireLock().Length == 0) { base.WriteHeader(); } } } /// <summary> /// Custom class for log4net Header Pattern /// </summary> public class CustomHeaderPatternLayout : PatternLayout { public override string Header { get { StringBuilder headerBuilder = new StringBuilder(); headerBuilder.AppendLine("Text \tSource \tTarget \tLocation \tResults \tUserAgent \tUserIP"); return headerBuilder.ToString(); } } } And this is configuration: <appender name="RollingStatsLogFileAppender" type=" CustomHeaderLogFile"> <file type="log4net.Util.PatternString" value="C:\\Logs\\infoFile_"/> <appendToFile value="true"/> <lockingModel type="log4net.Appender.FileAppender+MinimalLock"/> <datePattern value="yyyy'_'MM'_'dd'.tsv'"/> <rollingStyle value="Date"/> <encoding value="utf-8"/> <layout type="CustomHeaderPatternLayout"> <conversionPattern value="%message%newline" /> </layout> <staticLogFileName value="false"/> </appender> There was something like different processes created a file for each. When I enabled debugging I saw in the errors : log4net:ERROR [CustomHeaderLogFile] ErrorCode: GenericFailure. Unable to acquire lock on file C:\\Logs\\infoFile... The process cannot access the file .. because it is being used by another process. Can you help me with this issue? I need to have a single file, with custom header, rolling by date, current file should contain the current date. Ex: infoFile_2015_09_03.tsv infoFile_2015_09_04.tsv infoFile_2015_09_05.tsv Thank you, Vali