I am facing one strange issue and not able to find the solution. Issue is logs are not written when testing with high performance. I am using logback - syslog in apache karaf container. In normal scenario, everything works fine, but when i change the log level to debug and try to do some performance tests, logs write is stopped at some point and it never writes. The issue is happening because of the logging framework. We are using Syslog logging framework, which actually writes the logs to the socket and later that would write to a file. In this particular scenario, after a particular time, the logs have been stopped writing but can see that there are sockets open which are waiting to write the logs to the file. Any solution or pointers to resolve the issue would be very helpful. *O/P of netstat -p command showed 151 connections in CLOSE_WAIT state: * ........................................................................................................ tcp 1 0 172.30.2.144:39830 172.30.2.144:pcsync-https CLOSE_WAIT 3513/java tcp 1 0 172.30.2.144:39965 172.30.2.144:pcsync-https CLOSE_WAIT 3513/java tcp 1 0 172.30.2.144:42245 172.30.2.144:pcsync-https CLOSE_WAIT 3513/java tcp 1 0 172.30.2.144:42416 172.30.2.144:pcsync-https CLOSE_WAIT 3513/java tcp 0 0 localhost:41277 localhost:pcsync-https CLOSE_WAIT 3640/java tcp 0 0 localhost:44855 localhost:pcsync-https CLOSE_WAIT 3640/java tcp 0 0 localhost:41891 localhost:pcsync-https CLOSE_WAIT 3640/java tcp 0 0 localhost:43136 localhost:pcsync-https CLOSE_WAIT 3640/java tcp 0 0 localhost:42733 localhost:pcsync-https CLOSE_WAIT 3640/java tcp 0 0 localhost:41580 localhost:pcsync-https CLOSE_WAIT 3640/java tcp 0 0 localhost:44162 localhost:pcsync-https CLOSE_WAIT 3640/java tcp 0 0 localhost:45270 localhost:pcsync-https CLOSE_WAIT 3640/java tcp 0 0 localhost:43482 localhost:pcsync-https CLOSE_WAIT 3640/java tcp 0 0 localhost:43192 localhost:pcsync-https CLOSE_WAIT 3640/java .................................................................................................................. *logback.xml* <configuration> ........................................................ <appender name="karaf" class="ch.qos.logback.classic.net.SyslogAppender"> <facility>LOCAL1</facility> <syslogHost>localhost</syslogHost> <suffixPattern>karaf: [%thread] %logger{36} - %msg%n</suffixPattern> </appender> <appender name="shared" class="ch.qos.logback.classic.net.SyslogAppender"> <facility>LOCAL1</facility> <syslogHost>localhost</syslogHost> <suffixPattern>shared: [%thread] %logger{36} - %msg%n</suffixPattern> </appender> <appender name="css2" class="ch.qos.logback.classic.net.SyslogAppender"> <facility>LOCAL1</facility> <syslogHost>localhost</syslogHost> <suffixPattern>css2: [%thread] %logger{36} - %msg%n</suffixPattern> </appender> ...................................................... </configuration>