Secure Password Policy Enforcer Web
Password Policy Enforcer Web is designed to operate securely, but you must ensure that the web server is also secure. Follow Microsoft's recommendations to secure the web server, and always install and use an SSL certificate if Password Policy Enforcer Web will be used on an unencrypted network.
Install an SSL Certificate
Password Policy Enforcer Web sends passwords to the domain controllers over a secure connection, but you need to set up SSL (Secure Sockets Layer) encryption for the connection between the web browser and the web server.
CAUTION: Do not use Password Policy Enforcer Web on a production network without SSL encryption.
You can use a self-signed certificate, but most organizations purchase certificates from a certificate authority. This is a recurring cost, and you will need to complete forms for the certificate authority to verify your identity. You can install Password Policy Enforcer Web on a server that already has an SSL certificate if you would rather not purchase another one.
The IIS documentation explains how request, install, and use SSL certificates.
See the Configure Server Certificates in IIS 7 Microsoft knowledge base article for additional information.
Ensure that users only access Password Policy Enforcer Web over an encrypted connection after the SSL certificate is installed. The URL should start with https://. Web browsers can be redirected to always use the secure URL.