Administrator's Guide - Kerio Software Archive

Chapter 13
HTTP and FTP filtering
Kerio Control provides a wide range of features to filter traffic using HTTP and FTP protocols.
These protocols are the most spread and the most used in the Internet.
Here are the main purposes of HTTP and FTP content filtering:
• to block access to undesirable Web sites (i.e. pages that do not relate to employees’
work)
• to block certain types of files (i.e. illegal content)
• to block or to limit viruses, worms and Trojan horses
Let’s focus on filtering options featured by Kerio Control. For their detailed description, read
the following chapters.
HTTP protocol
— Web pages filtering:
• access limitations according to URL (substrings contained in URL addresses)
• blocking of certain HTML items (i.e. scripts, ActiveX objects, etc.)
• filtering based on classification by the Kerio Web Filter module (worldwide
website classification database)
• limitations based on occurrence of denied words (strings)
• antivirus control of downloaded objects
FTP protocol
— control of access to FTP servers:
• access to certain FTP servers is denied
• limitations based on or file names
• transfer of files is limited to one direction only (i.e. download only)
• certain FTP commands are blocked
• antivirus control of transferred files
Note: Kerio Control provides only tools for filtering and access limitations. Decisions on which
websites and files will be blocked must be made by the administrator (or another qualified
person).
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