What are some of the things that a firewall can't prevent?


E‑mail viruses

E‑mail viruses are attached to e‑mail messages. A firewall can't determine the contents of e‑mail messages, so it can't protect you from these types of viruses. You should use an antivirus program to scan and delete suspicious attachments from an e‑mail message before you open it. Even when you have an antivirus program, you should not open an e‑mail attachment if you're not positive it's safe.

Phishing scams

Phishing is a technique used to trick computer users into revealing personal or financial information, such as a bank account password. A common online phishing scam starts with an e‑mail message that appears to come from a trusted source, but actually directs recipients to provide information to a fraudulent website. Firewalls can't determine the contents of e‑mail messages, so they can't protect you from this type of attack.

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