Hi, We currently experience a Warning logged in our stderrout log each time our application log rolls over. I think this has started after an upgrade of logback a while back. I can't find much info about what the problem might be in the forum or by googling. Anyone have an idea what the issue might be? Message: 00:02:18,709 |-WARN in ch.qos.logback.core.rolling.helper.SizeAndTimeBasedArchiveRemover@3640c655- Unexpected periodsElapsed value 0 Our appender config: <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <fileNamePattern>${basedir:-.}/../logs/foo-${artifact}.%d{yyyy-MM-dd}.%i.log.zip</fileNamePattern> <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP"> <maxFileSize>100MB</maxFileSize> </timeBasedFileNamingAndTriggeringPolicy> <maxHistory>60</maxHistory> </rollingPolicy> <encoder> <pattern>%d{HH:mm:ss.SSS} [%property{hostname}] [%thread] [%X{auth_kontoid} %X{logid}] %-5level %logger{36} - %msg%n</pattern> </encoder> </appender> Thanks, Henning