ImportantSelecting this option allows you to enable Retro Scan, a cloud-based
                                             service that scans historical web access logs for callback attempts
                                             to C&C servers and other related activities in your network. Web
                                             access logs may include undetected and unblocked connections to
                                             C&C servers that have only recently been discovered. Examination
                                             of such logs is an important part of forensic investigations and may
                                             help you determine if your network is affected by attacks.
                                           
                                          
                                          Trend Micro recommends
                                             enabling Retro Scan in step 4.
                                           
                                          
                                        | 
                                 
                                       ImportantSelecting this option disables Retro Scan and deletes all previous
                                             Retro Scan detection logs.
                                           
                                          
                                        | 
                                 
                                          NoteIf proxy settings are disabled, Smart Protection Servers that
                                                connect through the proxy server will connect to Deep Discovery Inspector
                                                directly. Under the Proxy Connection
                                                column, the status displays  
                                             
                                          Nowhen proxy settings are disabled.  | 
                                    
                                          NoteOn the proxy server, configure the following ports
                                                to allow a connection to Smart Protection Server:
                                              
                                             
                                             
  | 
                                    
                                          NoteAdd up to 10 servers. If multiple servers are configured, Deep Discovery Inspector
                                             connects to  servers following the order in which they appear in the
                                             list.
                                           
                                        | 
                                    
                                          TipTrend Micro recommends adding multiple
                                             Smart Protection Servers for failover purposes. If Deep Discovery Inspector is
                                             unable to connect to a server, it attempts to connect to other
                                             servers on the Smart Protection Server List.
                                           
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