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First, disable all ActiveX Controls as described in Blocking All ActiveX Controls. Then, exclude your business partner from this restriction by adding the business partner's domain to the Pass List as described in Unblocking Spyware Websites.

Web Filter

Web Filter appeals to customers who require an added level of protection or are subject to regulations. For example, Web Filter helps libraries comply with Children's Internet Protection Act); equally important, Web Filter helps schools control hate speech. Pornography is still a big workplace productivity problem for companies, and Web Filter's categorization is a great solution for this problem.

The main technical differences between these products is that Web Filter offers:

 Real-time classification and updates. Web Filter uses a community-based approach whereby a large base of Web Filter users and Untangle itself categorize URLs. However, Web Filter combines both human beings—and sophisticated web crawlers. Web Filter runs web crawlers throughout the day. If Web Filter's web crawlers detect a new site or if you visit a site that Web Filter doesn't know about, it immediately analyzes it, then does the following:

 If Web Filter's engine can identify the content with high probability, it will categorize it.

 If Web Filter's engine cannot identify the content with high probability, it will be assigned to be identified by a human.

Web Filters techniques result in more categorization (over 100,000 URLs daily), more accuracy, and faster turnaround time. When identifies a malicious website, customers get the update within seconds. Time is essential in web content filters because new websites go live very quickly.

 Categorize HTTPS traffic by IP address. Untangle can block site via a URL or the IP address of the web site. Since secure websites cannot be scanned, this feature tries to use reverse DNS to figure out the category. (If https appears in the URL, then you know it's a secure site.) If it cannot resolve, this option will block inbound and outbound SSL traffic on port 443.

So, for example, when you log on to your online banking account to view a statement, a secure site prevents others on the network from capturing private information such as your username and password. But, there's a dirty little secret that's known to those who want to bypass web filters. Often used in the pornography industry, the web site is set up as a secure site. Web Filter easily combats this tactic because Web Filter also cateogorizes the destination IP address, which isn't unknown. This feature is implemented via the Web Filter Scan HTTPS check box.

 Detailed categorization. Web Filter does a good job categorizing, but Web Filter offers over 53 categories and over 450 million categorized sites. The abundance of categories means that you can narrow your scope. For example, maybe you want to block websites related to Dating, but not Social Networking.

You can do so with Web Filter.

Settings

This section reviews the different settings and configuration options available for Web Filter.

Block Lists

This tab controls the different mechanisms to classify and block or flag content.

Categories

Category blocking is driven by the zvelo SiteFilter database.

If block is checked any sites and URLs in that category will be blocked and flagged as a violation. If only flag is checked (but not block) the visit will be flagged as a violation but still allowed to pass. Flagging a visit as a violation has no visible effect to the user but makes finding and tracking undesired behavior in the reports easier.

Note: All URLs visited from machines behind an active application will be automatically tagged for categorization, but if you want to manually add or check a URL you can use the zvelo URL checker.

Categorize HTTPS traffic by IP address

When this option is enabled, will attempt to match HTTPS traffic to its IP address database since the destination IP address is all it has to work with.

Blocked Sites

To block a specific website:

1. From Web Filter, click the Block Lists tab and the Edit Sites button.

1. In the table, click the add (+) button to the left of the table.

2. In the new entry, add the URL that you want to block.

3. Click Done

2. Click the Save button to save the newly added entries or the Apply button to save and continue adding new entries.

3. Click the OK button

Tip: If you want to temporarily unblock this website later, deselect the block check box.

Blocking File Types

To block content by file type:

1. From Web Filter, click the Block Lists tab and the Edit File Types button.

2. In the table, do one of the following:

o If the file type that you want to block already appears in the table, select the block or log check box or both.

o If you want to block a file type that isn't in the list, click the add (+) button to the left of the table, then specify the file type that you want to block.

3. Click the Save button, then OK.

o If the MIME type that you want to block appears in the table, select the block check box for that MIME type.

o If you need to add a new MIME type, click the add (+) button to the left of the table, and in the new entry, add the MIME type that you want to block.

3. Click the Save button, then OK.

Enforce safe search on popular search engines

When this option is enabled, safe search will be enforced on all searches using supported search engines (Google, Yahoo, etc).

Block pages from IP only hosts

When this option is enabled, users entering the IP address rather than domain name will see a block page.

User Bypass

Some organizations may wish to allow certain users to bypass the Web Filter. This option is available under "User Bypass."

If User Bypass is set to None no users will be allowed to bypass the block page. If User Bypass is set to Temporary users will be allowed to bypass the block page for one hour from the time it is bypassed. If User Bypass is set to Permanent and Global then users will be allowed to bypass the block page and bypassed sites will be added to the permanent global pass list.

User Bypass is best when combined with Policy Manager so that only certain users are allowed to bypass.

To configure User Bypass:

1. From Web Filter, click the Block Lists tab.

2. Under User Bypass choose None, Temporary, or Permanent and Global 3. Click the Save button.

Pass Lists

Pass Lists are used to pass content that would have otherwise been blocked. This can be useful for "unblocking" sites that you don't want blocked or allowing certain users special privileges.

Passed Sites

If your organization deems a specific website to be useful and that site or URL should not be blocked regardless of its categorization, it can be added to the Passed Sites list.

To pass a specific URL blocked by a category:

1. From Web Filter, click the Pass Lists tab and the Edit Passed Sites button.

2. In the table, do one of the following:

To pass a specific URL blocked by a user-defined URL:

1. From Web Filter, click the Block Lists tab and the Edit Sites button.

2. In the table, locate an existing URL that you want to pass, and clear the block check box, or simply delete the row.

3. Click the Save button, then OK.

Passed Clients

If you only have a few users that need to completely bypass Web Filter controls, consider using pass lists. If these users simply need a different Web Filter policy you should set up a separate rack using Policy Manager.

Before You Begin: It may be useful to assign the user a static IP address. If the Untangle Server is your router, go to Assigning Network Computers Static IP Addresses.

To pass for specific users:

1. From Web Filter, click the Pass Lists tab and the Edit Passed Client IPs button.

2. In the table, select the add (+) button. A new row appears.

3. In the IP address/range text box, specify the computer IP address and subnet mask of user that you want to be exempt from the web filter.

4. Click the Update button, then Save.

Event Log

Use the following terms and definitions to understand the Web Filter Event Log:

timestamp The time the event took place.

action The action which the Untangle Server took on the web request.

client IP address of the client who made the request.

request A description of the request made (e.g. http://someurl/somepath.html).

reason for

action The reason the action was taken.

server The server IP Address. The server is the computer that receives the request.

Web Filter FAQs

Does Web Filter use a lot of memory and CPU?

If your Untangle Server is operating well without Web Filter, then you won't see much of a difference if you run Web Filter. Web Filter doesn't use much memory, and there's very little CPU utilization.

How do real-time updates work in an Untangle Server environment?

Untangle Server keeps a local copy of the Web Filter database. If you visit a website that the Web Filter database doesn't know about, Web Filter phones home to the Web Filter service, then writes the new information to the Web Filter database.

How long does Web Filter cache visited sites?

Several days. Web Filter flushes non-frequently used cache. The website that you visit daily will not be cleared from cache.