In my case, I had to configure my appender by adding a parameter to it as follows:
<appender name="RollingFile" type="log4net.Appender.RollingFileAppender">
[...]
<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
[...]
</appender>
I just set the blocking model to minimal blocking and it did the job.
NTN
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