I am running Sitecore 9 and am experiencing moments when the Sitecore log is no longer updated (i.e. written to).

I have a default log4net configuration. Only addition I have is a rolling log file appender:

<appender name="StaticFileAppenderTxt" type="log4net.Appender.RollingFileAppender, Sitecore.Logging">
    <file value="$(dataFolder)/logs/_Log.txt" />
    <appendToFile value="true" />
    <rollingStyle value="Size" />
    <maxSizeRollBackups value="10" />
    <maximumFileSize value="1000KB" />
    <staticLogFileName value="true" />
    <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%4t %d{ABSOLUTE} %-5p %m%n" />
    <encoding value="utf-8" />

But this seems unrelated to the problem as the "normal" log file is also not updated.

Only solution I found so far is performing an IISReset. This is clearly unconvenient.

Any thoughts?

  • 1
    Did you have a look at this: stackoverflow.com/questions/14963735/…
    – TamerM
    Commented Nov 8, 2018 at 11:36
  • Is there any information in the windows event viewer?
    – Mikeyp
    Commented Nov 8, 2018 at 14:29
  • No, nothing related in the windows event viewer. Trying the ImmediateFlush parameter.
    – Joost
    Commented Nov 8, 2018 at 21:08
  • Im having same issue in Sitecore 8.1 update 2 solution. basically rollingappender is not working for me.
    – nari447
    Commented Nov 9, 2018 at 7:46
  • @Joost.. I just found out that in my case log files are being created at root of my c drive (c:\data\logs\..).. Please check if this is the case with you.
    – nari447
    Commented Nov 9, 2018 at 9:23

1 Answer 1


Solved by adding:

<param name="ImmediateFlush" value="true" />

to the configuration, as mentioned here: https://stackoverflow.com/questions/14963735/log4net-rollingfileappender-not-flushing-io-buffer-with-low-volume-log.

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