Monitoring Web Filtering Events

Purpose

Use this page to view information about security events based on Web filtering policies. Web filtering allows you to permit or block access to specific websites by URL or by URL category using cloud-based lookups, a local database, or an external Websense server. Analyzing Web filtering logs yields useful security management information such as users detected accessing restricted URLs and actions taken by the system. Using the time-frame slider, you can quickly focus on the area of activity that you are most interested in. Once the time range is selected, all of the data presented in your view is refreshed automatically. You can also use the Custom button to set a custom time range.

Action

To monitor Web filtering events select Monitor>Events>Web Filtering in the J-Web user interface.

Meaning

Time Range graph displays the trend of all events or flow for all the events that has transpired in the device.

You can specify the duration of time for which you want to view the trend for all events. The available options are 30m, 1h, 2h,…, and so on, which are displayed at the top right hand side of the page. For example, if you choose 30m, the end time is the current system time and the start time is the preceding 30 minutes from the current system time.

Click Custom to specify a customized time range. The Custom Time Range Selection popup window is presented. You can set the from and to date and time, and click OK to set the time range.

To refresh the graph on demand, click the refresh button.

You can also drag the slider in the Time Range graph from the extreme left or right of the graph and set the time range to see the trend or flow of events that has transpired in that time range.

There are two ways to view your data. You can select either the Summary View tab or the Detailed View tab.

The Summary View is selected by default, and it gives a brief summary of all the Web filtering events in your network.

The data presented in the line graph (also known as swim lanes) is refreshed automatically based on the selected time range. The line graph shows light blue lanes that represent all Web filtering events and dark blue lanes represent blocked Web filtering events.

Below the swim lanes are widgets displaying critical information such as top URLs blocked, top matched profiles, top five sources, and top five destinations.

See Table 15 for descriptions of the widgets.

Table 15: Widgets in Summary View

Widget Name

Displays

Top URLs Blocked

Top URLs that are blocked.

Top Matched Profiles

Top matched profiles.

Top Sources

Top five source IP addresses of the network traffic; sorted by event count.

Top Destinations

Top five destination IP addresses of the network traffic; sorted by event count.

Click the Detailed View for comprehensive details of events in a grid format that includes sortable columns. It displays information in grids that are lazy loaded with infinite scrolling. You can narrow down your search to a particular event based on IP address, description, or event name. The table includes information such as the rule that caused the event, severity for the event, event ID, traffic information, and how and when the event was detected.

Table 16: Filter Options in Detailed View

The dropdown filter that is displayed above the grids.

Options available in the filter dropdown are: event-name, source-address, destination-address, application, user, service, policy, source-interface, source-zone.

Select the criteria or parameter on which you want to construct the filter statement.

Text box

Displays the filter parameter that you selected from the filter dropdown.

Note:

In the filter statement the following limitation exists.

  • You can use only one operator at a time.
  • You can use only one instance of the criteria or paramenter in one filter statement.

For example, if you have used & operator and the parameter Event-Name once, I cannot use them again in the same filter statement

CORRECT USAGE: Event-Name = rt_flow_session_close & application=TELNET

WRONG USAGE:Event-Name = rt_flow_session_close & Event-Name = rt_flow_session_create

WRONG USAGE:Event-Name = rt_flow_session_close & source-address = x.x.x.x & application = TELNET

Note: The filter statement is NOT case-sensitive.

Add the parameter for which you want to filter. For example, in the dropdown filter if you selected event-name as the parameter, the text box displays Event-Name =. If you add WEBFILTER_URL_BLOCKED to see only Web filtering events then the text box displays Event-Name = WEBFILTER_URL_BLOCKED.

Go

Executes the filter statement that is displayed in the text box.

Click Go.

X

Clears the filters.

Click x.

The Table 17 describes the grid information displayed in the Detailed View.

Table 17: Web Filtering Events - Grid Elements in Detailed View

Grid Element

Description

Event Name

The event name of the log.

Description

The description of the log.

UTM Category or Virus Name

The UTM category or name of the virus.

Source IP

The source IP address from where the event occurred.

Source Port

The source port of the event.

Destination IP

The destination IP address of the event.

Destination Port

The destination port of the event.

Hostname

The host name in the log.

SourceZone

User traffic received from the zone.

Roles

Role names associated with the event.

Reason

The reason for the log generation. For example, a connection tear down may have an associated reason such as authentication failed.

URL

Accessed URL name that triggered the event.

Object Name

The object name of the log.

Path Name

The path name of the log.

Action

Action taken for the event: warning, allow, and block.

Proflie Name

Profile name in the log.

Time

The time when the log was received.

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