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A process started by the service control manager has no standard handles, and writes to its absent stdout report success, so everything the daemon logged in service mode was lost. So were config-load failures, the service's own error report and panic messages, which all went to stderr. In service mode the daemon now logs to C:\ProgramData\fips\fips.log. The file is rolled at 10 MiB with four old files kept, so it takes at most about 50 MiB. A roll that fails, for example because another process holds the file, keeps writing to the current file and is not retried until another 10 MiB have been written. Config-load failures, the service error and panic messages go to the same file. A foreground run still logs to the console, and --install-service names the log file. The writer is built in rather than taken from a crate, so it is tested on every platform and adds no dependency. The Windows ZIP's README and the fips reference now say where the service log goes, and install-service.ps1 prints the log path.