ZoneAlarm Pro 4.5 review: ZoneAlarm Pro 4.5

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CNET Editors' Rating

4 stars Excellent
  • Overall: 8.0
  • Setup and interface: 9.0
  • Features: 8.0
  • Performance: 9.0
  • Service and support: 6.0
Review Date:
Updated on:

The Good Hides ports from hackers; retains custom settings after upgrade; slick interface is easy to use; new expert rules for pros.

The Bad No phone support; cumbersome rule-making process.

The Bottom Line ZoneAlarm Pro 4.5 is a great firewall for security rookies, but you'll still need a separate antivirus program.

CNET Editors' Choice Nov '03

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This firewall-cum-security suite--it features the firewall, plus a few privacy tools and a pop-up ad killer, but no antivirus app--now sports expert-style rules that let advanced users fine-tune Internet access privileges, an outbound mail monitor that watches for suspicious activity that could indicate a worm, and a way to report Web intruders. Plus, ZoneAlarm Pro 4.5 remains so easy to use that even a novice can manage it. Not all is rosy, however: there's still no way to call the ZoneAlarm help desk. If you're already using ZoneAlarm Pro, upgrade only if you want access to the expert rules. Looking for your first firewall? The always-free ZoneAlarm 4.5 does the trick, but only if you already have antivirus software installed. Download the 4MB ZoneAlarm Pro 4.5, and within five minutes, you can have your guard up. Unlike earlier editions, ZoneAlarm Pro 4.5 now offers you a choice: either download the free version of ZoneAlarm 4.5 and never be bothered again about purchasing the product or try ZoneAlarm Pro for a free 30-day trial. After 30 days, if you're still not inclined to pay $50 to purchase ZoneAlarm Pro, the product reverts to ZoneAlarm 4.5 without the need to reinstall--nor do you see any grayed-out features. No matter which version you choose, ZoneAlarm walks you through the opening configuration with a no-brains-necessary wizard that asks for a few simple choices. Keep clicking the Next button to arm your computer with the default defenses, which should be suitable for most users. Naturally, you can make additional changes at any time.

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ZoneAlarm's top screen quickly summarizes recent intrusion attempts.


There are no major interface changes in 4.5; it sports the same glossy, simple-enough-for-everyone look and feel as the last edition. The design looks an awful lot like Windows XP, with navigational tabs at the left that display detailed settings when you click them. You can even minimize the entire window to show only the Stop and Lock buttons, which disable protection and prevent any Net connection, respectively. Overall, we love this look.

ZoneAlarm Pro 4.5's heart remains its personal firewall, a guardian that makes sure intruders can't get into your PC from the Internet. Version 4.5 also includes an e-mail monitor that hunts for possible mass-mailing viruses and worms, a cookie manager, a pop-up and banner ad blocker, and an ActiveX and JavaScript defender.

ZoneAlarm Pro 4.5 configures itself to work with your default Internet browser during installation. The program stops any desktop program that tries to access the Internet, then displays an alert that asks if you want to authorize the connection. Click Yes the first time, and you're set thereafter.

New to version 4.5 are expert-level rules that define specific access and activity privileges for programs that need Internet access. These rules, which didn't exist in previous editions and may be reason enough to upgrade to version 4.5, are similar to those in Norton Personal Firewall 2004 , although they are more difficult to configure. Unfortunately, they still don't let you build rules that limit program access to specific ports or Internet protocols. Nor do we like the cumbersome process that requires you to choose options from pop-up lists while juggling multiple windows.

/sc/21131904-2-300-SS2.gif" width="300" height="225" border="0" />
After an attack, you can track the hacker back to the lair.


ZoneAlarm has also added a new reporting tool. Previously, the Hacker ID function only tracked down the location (both the IP address and the geographic locale) of any intruders onto your system. (Don't worry; ZoneAlarm automatically masks your address as it traces any suspected hackers.) However, the new reporting tool allows Zone Labs to periodically collect these trace-back reports and pass them on to the offender's ISP. Cool.

Other enhancements include a cache cleaner to wipe space-hogging temporary Internet files, browser histories, and cookies from your machine, plus an improved mail monitor that watches outbound mail for evidence of mass-mailing worm activity. (Previous versions already monitored inbound mail.) The latter isn't an antivirus protector--ZoneAlarm is still missing that important part of PC security strategy--but it will shut down your e-mail client if a virus or a worm tries to mass-mail copies of itself. For a complete security package, including antivirus protection, you should consider Norton Internet Security or McAfee Internet Security instead.

We ran ZoneAlarm Pro 4.5 against Steve Gibson's &siteid=7&edid=&lop=txt&destcat=sw&destUrl=http%3A%2F%2Fgrc%2Ecom%2Fintro%2Ehtm">ShieldsUp port tester. In stealth mode, our PC was invisible to the world, which is good. If hackers can't see your computer on the Internet, they can't get inside.

ShieldsUp common ports ZoneAlarm Pro 4.5 McAfee Personal Firewall Plus 5.0 Norton Personal Firewall 2004
Port 21-FTP Stealth Stealth Stealth
Port 23-Telnet Stealth Stealth Stealth
Port 25-SMTP Stealth Stealth Stealth
Port 79-Finger Stealth Stealth Stealth
Port 80-HTTP Stealth Stealth Stealth
Port 110-POP3 Stealth Stealth Stealth
Port 113-IDENT Stealth Stealth Stealth
Port 119-NNTP Stealth Stealth Stealth
Port 135-RPC Stealth Stealth Stealth
Port 139-NetBIOS Stealth Stealth Stealth
Port 143-IMAP Stealth Stealth Stealth
Port 389-LDAP Stealth Stealth Stealth
Port 443-HTTPS Stealth Stealth Stealth
Port 445-MSFTDS Stealth Stealth Stealth
Port 1002-ms-ils Stealth Stealth Stealth
Port 1024-DCOM Stealth Stealth Stealth
Port 1025-Host Stealth Stealth Stealth
Port 1026-Host Stealth Stealth Stealth
Port 1027-Host Stealth Stealth Stealth
Port 1028-Host Stealth Stealth Stealth
Port 1029-Host Stealth Stealth Stealth
Port 1029-Host Stealth Stealth Stealth
Port 1720-H.323 Stealth Stealth Stealth
Port 5000 UPnP Stealth Stealth Stealth
LeakTest Passed Passed Passed

To test ZoneAlarm Pro 4.5's firewall, we began with IP Agent, a free utility provided by ShieldsUp that determines the test machine's current IP address, then contacts the ShieldsUp Web site to begin testing.

Next, the Port Probe utility from ShieldsUp tested our system's defense against Internet port scanners. The test originates from the ShieldsUp server and attempts to establish standard TCP/IP (Internet) connections on a handful of commonly exploited Internet service ports on the test computer.

Using ShieldsUp, each port gives one of the three following results:

Stealth: This result means that the probe was not able to find this particular port on your computer. This is the most secure result.

Closed: This shows that the probe was able to detect this particular port on your computer but that the connection was refused.

Open: This result means that the port is actively advertising its presence on the Internet. Port scanners will have no trouble finding it.

More information on these tests and what the results mean can be found at &siteid=7&edid=&lop=txt&destcat=sw&destUrl=http%3A%2F%2Fgrc%2Ecom%2Fintro%2Ehtm">ShieldsUp.

More information about how we test firewalls can be found at CNET Labs.
Zone Labs still doesn't get it: phone support is a must-have. If you have a problem with ZoneAlarm Pro, you won't be able to call the company. Instead, you can browse a brief online FAQ, send an e-mail message, or rely on the kindness of strangers who host the forums accessed through Zone Labs' Web site. And the online help, which includes some of the program's well-known problems, is skimpy.

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You'll find ZoneAlarm's best tech support in its message forum.


We don't like the e-mail form, either. For a prompt response, you have to type in your 20-letter product key code first, and even then, Zone Labs promises to respond in three to four business days. That's just not fast enough if you're sweating something as important as your firewall. Our advice: Try the forums.

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Where to Buy See all prices

ZoneAlarm Pro 4.5

Part Number: CNETZONEALARMPRO4 Released: Jun 12, 2003
MSRP: $39.99 Low Price: $13.84 See all prices

Quick Specifications See All

  • Release date Jun 12, 2003
  • Category security applications
  • Compatibility PC