Your browser does not support HTML5 local storage or you have disabled it. Some functionality on this site, including saving your privacy settings and offering you special discounts, uses local storage and may not work with local storage disabled. We recommend allowing the use of local storage in your browser. In some browsers, it is the same setting used for disabling cookies.
The log facility for sftp-server and internal://sftp-server is set with SftpSysLogFacility. Here, the informational level logs very verbosely. (For example, stat-calls are logged. This can happen hundreds of times when reading a directory listing.) Usually, you want to use a higher level (for example, notice) for logging SFTP.
Nothing is logged by the SFTP-service if the SftpSysLogFacility is not set in the configuration.