Administrator's Guide - Kerio Software Archive

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Configuration of network services Enable connection to any TCP port This security option enables to allow or block so called tunneling of other application protocols (than HTTP, HTTPS and FTP) via the proxy server. If this option is disabled, the proxy server allows to establish connection only to the standard HTTPS port 443) — it is supposed that secured web pages are being opened. If the option is enabled, the proxy server can establish connection to any port. It can be a non-standard HTTPS port or tunneling of another application protocol. Note: This option does not affect the non-secured traffic performed by HTTP and/or FTP. In Kerio Control, HTTP traffic is controlled by a protocol inspectors which allows only valid HTTP and FTP queries. Forward to parent proxy server Tick this option for Kerio Control to forward all queries to the parent proxy server which will be specified by the following data: • Server — DNS name or IP address of parent proxy server and the port on which the server is running (3128 port is used by the default). • Parent proxy server requires authentication — enable this option if authentication by username and password is required by the parent proxy server. Specify the Username and Password login data. Note: The name and password for authentication to the parent proxy server is sent with each HTTP request. Only Basic authentication is supported. The Forward to parent proxy server option specifies how Kerio Control will connect to the Internet (for update checks, downloads of Sophos updates and for connecting to the online Kerio Web Filter databases). Set automatic proxy configuration script to... If a proxy server is used, Web browsers on client hosts must be configured correctly. Most common web browsers (e.g. Internet Explorer, Firefox/SeaMonkey, Opera, etc.) enable automatic configuration of corresponding parameters by using a script downloaded from a corresponding website specified by URL. In the case of Kerio Control’s proxy server, the configuration script is saved at http://192.168.1.1:3128/pac/proxy.pac, where 192.168.1.1 is the IP address of the Kerio Control host and number 3128 represents the port of the proxy server (see above). The Allow browsers to use configuration script automatically... option adjusts the configuration script in accord with the current Kerio Control configuration and the settings of the local network: • Direct access — no proxy server will be used by browsers • Kerio Control proxy server — IP address of the Kerio Control host and the port on which the proxy server is running will be used by the browser (see above). 146
9.5 HTTP cache Note: The configuration script requires that the proxy server is always available (even if the Direct access option is used). Allow browsers to use configuration script automatically... It is possible to let Internet Explorer be configured automatically by the DHCP server. To set this, enable the Automatically detect settings option. Kerio Control’s DHCP server must be running (see chapter 9.2), otherwise the function will not work. TCP/IP parameters at the host can be static — Internet Explorer sends a special DHCP query when started. Hint: This method enables to configure all Internet Explorer browsers at all local hosts by a single click. 9.5 HTTP cache Using cache to access Web pages that are opened repeatedly reduces Internet traffic (in case of line where traffic is counted, it is also remarkable that using of cache decreases total volume of transferred data). Downloaded files are saved to the hard drive of the Kerio Control host so that it is not necessary to download them from the web server again later. All objects are stored in cache for a certain time only (Time To Live — TTL). This time defines whether checks for the most recent versions of the particular objects will be performed upon a new request of the page. The required object will be found in cache unless the TTL timeout has expired. If it has expired, a check for a new update of the object will be performed. This ensures continuous update of objects that are stored in the cache. The cache can be used either for direct access or for access via the proxy server. If you use direct access, the HTTP protocol inspector must be applied to the traffic. In the default configuration of Kerio Control, this condition is met for the HTTP protocol at the default port 80 (for details, see chapters 7.3 and 15.3). To set HTTP cache parameters go to the Cache tab in Configuration → Content Filtering → HTTP Policy. Enable cache on transparent proxy This option enables cache for HTTP traffic that uses the HTTP protocol inspector (direct access to the Internet). Enable cache on proxy server Enables the cache for HTTP traffic via Kerio Control’s proxy server (see chapter 9.4). HTTP protocol TTL Default time of object validity within the cache. This time is used when: • TTL of a particular object is not defined (to define TTL use the URL specific settings button —see below) • TTL defined by the Web server is not accepted (the Use server supplied Time-To- Live entry) 147
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Kerio Control Administrator’s Gui
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Contents 1 Quick Checklist . . . .
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13 HTTP and FTP filtering . . . . .
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26 Technical support . . . . . . .
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8. Enable the intrusion prevention
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2.2 Conflicting software Warning: S
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2.3 System requirements met). 2.3 S
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2.4 Installation - Windows • TCP/
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2.4 Installation - Windows Warning:
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2.5 Initial configuration wizard (W
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2.6 Upgrade and Uninstallation - Wi
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2.7 Installation - Software Applian
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2.7 Installation - Software Applian
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2.10 Kerio Control Engine Monitor (
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2.11 The firewall’s console (Soft
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3.1 Kerio Control Administration we
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3.2 Administration Console - the ma
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3.3 Administration Console - view p
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Chapter 4 License and Registration
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4.3 License information User is def
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4.4 Registration of the product in
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4.6 Subscription / Update Expiratio
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Chapter 5 Network interfaces Kerio
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5.3 Viewing and editing interfaces
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5.3 Viewing and editing interfaces
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5.5 Advanced dial-up settings Figur
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5.6 Supportive scripts for link con
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6.1 Persistent connection with a si
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6.1 Persistent connection with a si
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6.2 Connection with a single leased
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6.3 Connection Failover Advanced di
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6.3 Connection Failover Figure 6.8
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6.4 Network Load Balancing Note: 1.
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6.4 Network Load Balancing On the t
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6.4 Network Load Balancing Hint: Sp
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Chapter 7 Traffic Policy Traffic Ru
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7.1 Network Rules Wizard Step 4 —
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7.1 Network Rules Wizard Figure 7.5
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7.1 Network Rules Wizard Note: In t
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7.3 Definition of Custom Traffic Ru
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14.3 HTTP and FTP scanning Use the
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14.4 Email scanning If only an aste
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14.4 Email scanning Figure 14.9 Set
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14.5 Scanning of files transferred
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15.2 Time Ranges Figure 15.2 IP gro
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15.3 Services Figure 15.4 Time rang
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15.3 Services Protocol The communic
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15.4 URL Groups Note: 1. Generally,
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15.4 URL Groups Examples:: • www.
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16.1 Viewing and definitions of use
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16.2 Local user accounts Accounts m
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16.2 Local user accounts Name Usern
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16.2 Local user accounts Step 3 —
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16.2 Local user accounts Figure 16.
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16.2 Local user accounts Within thi
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16.3 Local user database: external
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16.4 User accounts in Active Direct
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16.5 User groups Note: In case of u
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16.5 User groups Using the Add and
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Chapter 17 Administrative settings
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17.3 Update Checking Figure 17.2 Tr
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17.3 Update Checking Last update ch
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18.1 Routing table Route Types The
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18.2 Universal Plug-and-Play (UPnP)
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18.3 Relay SMTP server 18.3 Relay S
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Chapter 19 Status Information Kerio
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19.1 Active hosts and connected use
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19.2 Network connections overview
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19.4 Alerts • Session duration.
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19.4 Alerts • Connection failover
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19.4 Alerts Click an event to view
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20.1 Volume of transferred data and
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20.2 Interface statistics Figure 20
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20.2 Interface statistics Figure 20
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21.1 Monitoring and storage of stat
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21.2 Settings for statistics and qu
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21.3 Connection to StaR and viewing
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21.3 Connection to StaR and viewing
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22.1 Log settings Figure 22.1 Log s
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22.1 Log settings Figure 22.3 Syslo
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22.2 Logs Context Menu • Target f
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22.3 Alert Log Figure 22.7 Highligh
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22.5 Connection Log A typical examp
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22.6 Debug Log The expression must
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22.7 Dial Log 3. Disconnection caus
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22.9 Filter Log • 8000-8099 — H
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22.10 Http log Packet log example:
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22.11 Security Log An example of Ht
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22.11 Security Log Example: [17/Jul
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22.13 Warning Log Events causing di
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Chapter 23 Kerio VPN Kerio Control
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23.1 VPN Server Configuration Figur
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23.1 VPN Server Configuration the V
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23.1 VPN Server Configuration Kerio
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23.3 Interconnection of two private
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23.4 Exchange of routing informatio
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23.5 Example of Kerio VPN configura
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23.6 Example of a more complex Keri
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24.1 Kerio Control SSL-VPN configur
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Chapter 25 Specific settings and tr
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25.3 Automatic user authentication
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25.3 Automatic user authentication
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25.4 FTP over Kerio Control proxy s
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25.5 Internet links dialed on deman
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The text file will be stored in the
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Appendix B Used open source items K
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Copyright © 2005 Harald Welte Dist
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Glossary of terms ActiveX This Micr
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Ident The Ident protocol is used fo
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Policy routing Advanced routing tec
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TCP Transmission Control Protocol i
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dial-up 64 dialing scripts 21, 58 h
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S service 89, 207 SIP 210 SSL-VPN 3
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