Logging SFTP Transactions
 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.
 In /etc/ssh2/sshd2_config add the following:
 
SftpSysLogFacility  LOCAL7
  | 
 In /etc/syslog.conf add the following:
 
local7.notice       /var/log/sftp
  |