Cisco Cisco Email Security Appliance C170

The User Guide PDF may be more current than the online help. To obtain the User Guide PDF and other 
documentation for this product, click the View PDF button in the online help or visit the URL shown in 

. 

Information about other resources, including the knowledge base and Cisco support community, is in the 
online help and the User Guide PDF. 

Using a proxy is not supported for communications between the Email Security appliance and the file 
reputation and file analysis services in the cloud, even if an upstream proxy is transparent to the Email 
Security appliance.  

The criteria for evaluating a file’s reputation and for sending files for analysis may change at any time. 
Criteria are available only to registered Cisco customers. See File Criteria for Advanced Malware 
Protection Services for Cisco Content Security Products, available from 

. 

In order to access this document, you must have a Cisco customer account with a support contract. To 
register, visit https://tools.cisco.com/RPF/register/register.do. 

AsyncOS is designed to automatically deploy and update the certificates needed for communications 
with cloud services used for URL filtering features. However, if for any reason the system is unable to 
update these certificates, you will receive an alert that requires action from you. 

To ensure that you receive these alerts (System type, Warning severity), see information in the online 
help or user guide about adding alert recipients. 

If you receive an alert about an invalid certificate, contact Cisco TAC, which can provide the required 
replacement certificate. Instructions for installing the certificate are in the URL Filtering chapter in the 
online help or user guide. 

For details about the connection between the appliance and the cloud URL reputation and category 
services, see the URL Filtering chapter of the user guide or online help.