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To maximize compatibility, VPNs in Windows Small Business Server 2003 aren t locked down as tightly as they could be. However, you can increase VPN security significantly with no compatibility problems as long as all clients run Windows 98 or later with High Encryption (128 bit) support. To do so, first install Internet Authentication Service (IAS), Microsoft s implementation of a Remote Authentication Dial-In User Service (RADIUS) server. (IAS is also needed for L2TP VPNs and 802.1X wireless authentication.) To install IAS, complete the following steps: 1. Open Add Or Remove Programs in Control Panel and then click Add/ Remove Windows Components. The Windows Components Wizard opens. 2. On the Windows Components page, select Networking Services and click Details. 3. In the Networking Services dialog box, select the check box next to Internet Authentication Service, click OK, and then click Next. The Windows Components Wizard installs IAS. Click Finish when it s done. Once IAS is installed, use the following steps to modify the Windows Small Business Server Remote Access Policy to disable the use of Microsoft Challenge

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Handshake Authentication Protocol (MS-CHAP) authentication and require 128-bit encryption: 1. From the Start menu, choose the Administrative Tools folder and then select Internet Authentication Service. This opens the Internet Authentication Service console. 2. Select Remote Access Policies and then double-click Small Business Remote Access Policy (Figure 15-7).

Figure 15-7.

If this is the first time this account has logged in, all the settings are the default settings, and there are no open applications. 10. On the Start menu, click Log Off. 11. In the Log Off Windows dialog box, click Switch User. 12. On the Welcome screen, click your own user name, and if your account is passwordprotected, enter your password. You are returned to your own user account, where the User Accounts and Control Panel windows are still open. (They might be minimized.) 13. Click the Close button to close the User Accounts window, and then close Control Panel.

3. In the Small Business Remote Access Policy Properties dialog box, click Edit Profile. The Edit Dial-In Profile dialog box appears. 4. Click the Authentication tab and then clear the Microsoft Encrypted Authentication (MS-CHAP) check box. 5. Click the Encryption tab (Figure 15-8) and clear all check boxes except Strongest Encryption (MPPE 128 bit), and then click OK.

Figure 15-8.

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Note Disabling MS-CHAP authentication prevents Microsoft Windows 95 clients from establishing remote access connections unless you install the Dial-Up Networking 1.3 Performance And Security Update for Windows 95, or upgrade the clients to Windows 98 or newer.

Most networks use password-based authentication to secure network communications such as VPN and wireless connections. When used with secure authentication methods such as MS-CHAP v2 (for PPTP VPN connections) or WPA (for wireless connections), password-based security can be quite secure. However, password-based authentication can be inconvenient (you must remember a password or network key), and doesn t ensure the integrity of transmitted data an industrious hacker could intercept, replay, and tamper with data. One way of addressing these issues is to sign communications with a digital certificate. Doing so also enables clients to verify the identity of the server (reducing the risk of rogue servers), and to digitally sign and encrypt e-mails. Digital certificates are required by L2TP VPN connections and 802.1X authentication of wireless networks.

After completing this chapter, you will be able to:

The first step in setting up 802.1X authentication or L2TP VPNs is to install Certificate Services and create an enterprise root Certificate Authority (CA), which can then be used to deploy certificates to users and computers on the network. To do so, complete the following steps: 1. Open Add Or Remove Programs in Control Panel and then click Add/ Remove Windows Components. The Windows Components Wizard appears. 2. On the Windows Components page, select Certificate Services in the component list. The installer warns you that after the CA software is installed, you can t change the name of the server or move it into or out of an Active Directory domain. Click Yes, and then click Next. 3. On the CA Type page (Figure 15-9), select Enterprise Root CA and then click Next. 4. On the CA Identifying Information page (Figure 15-10), type a descriptive name for the CA (most likely including the company name) and then click Next.

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Figure 15-9.

5. On the Certificate Database Settings page, accept the default storage location for the certificate database and log files and configuration information. Note that the location you specify isn t where issued certificates are stored; it s where the CA s own certificates are stored. Click Next.

Install speakers and a microphone. Install local and network printers. Install a scanner or camera. Install storage devices. Install programs and Windows components, and have them startautomatically.

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Note If the computer acting as the Enterprise Root CA crashes and you lose the CA database, you must reissue every certificate. Consider this extra motivation to regularly back up your entire Windows Small Business Server installation. 6. Click Yes when prompted to stop Microsoft Internet Information Services. When prompted, insert the appropriate Windows Small Business Server 2003 CD or DVD and then click OK. The Windows Components Wizard completes the installation of Certificate Services. Click Finish when it s done.