Cisco Cisco Web Security Appliance S370 사용자 가이드

Also see: 

When a native FTP request is transparently redirected to the FTP Proxy, it contains no hostname 
information for the FTP server, only its IP address. Because of this, some predefined URL categories 
and Web Reputation Filters that have only hostname information will not match native FTP requests, 
even if the requests are destined for those servers. If you wish to block access to these sites, you must 
create custom URL categories for them using their IP addresses.

If the connection between the FTP Proxy and the FTP server is slow, uploading a large file may take a long 
time, particularly when Cisco Data Security Filters are enabled. This can cause the FTP client to time out 
before the FTP Proxy uploads the entire file and you may get a failed transaction notice. The transaction 
does not fail, however, but continues in the background and will be completed by the FTP Proxy.

You can workaround this issue by increasing the appropriate idle timeout value on the FTP client.

FTP clients create a zero byte file on FTP servers when the FTP Proxy blocks an upload due to outbound 
anti-malware scanning.

This alert may or may not indicate a problem. The battery relearn timeout, in itself, does not mean there 
is any problem with the RAID controller. The controller can recover in the subsequent relearn. Please 
monitor your email for any other RAID alerts for the next 48 hours, to ensure that this is not the 
side-effect of any other problem. If you do not see any other RAID-type alerts from the system, then you 
can safely ignore this alert.