<log4net>
<appender name="FileAppenderGeneral" type="log4net.Appender.RollingFileAppender">
  <param name="File" value="LogsTekalnet.log" />
  <appendToFile value="true" />
  <rollingStyle value="Date" />
  <datePattern value="'.'dd" />
  <layout type="log4net.Layout.PatternLayout">
    <conversionPattern value="%d %-5p - %m%n" />
  </layout>
  <<securityContext type="log4net.Util.WindowsSecurityContext">
    <domainName value="hostname"/>
    <userName value="username" />
    <password value="password" />
  </securityContext>
  <encoding value="utf-8" />
</appender>

log4net.Config.XmlConfigurator.Configure();
        ILog[] loggers = LogManager.GetCurrentLoggers();
        foreach (ILog logger in loggers)
        {
            foreach (IAppender appender in logger.Logger.Repository.GetAppenders())
            {
                if (appender.GetType() == typeof(RollingFileAppender))
                {
                    log4net.Appender.RollingFileAppender fileAppender = (RollingFileAppender)appender;
                    WindowsSecurityContext securityContext = new log4net.Util.WindowsSecurityContext();
                    securityContext.DomainName = "hostname";
                    securityContext.UserName = "username";
                    securityContext.Password = "password";
                    securityContext.ActivateOptions();
                    fileAppender.SecurityContext = securityContext;
                }
            }
        }