Client for 32-bit Windows Administrator's Guide - Citrix Knowledge ...

Go to Document Center Chapter 6 Securing Client Communication 85System RequirementsIn addition to the system requirements listed for each Client in its respectivechapter, you also must ensure that:• The client device supports 128-bit encryption• The client device has a root certificate installed that can verify the signature ofthe Certificate Authority on the server certificate• The Client is aware of the TCP listening port number used by the SSL Relayservice in the server farmVerifying Cipher Strength/128-bit EncryptionIf you have Internet Explorer installed on your system, you can determine theencryption level of your system as follows:1. Start Internet Explorer.2. From the Help menu, click About Internet Explorer.3. Check the Cipher Strength value. If it is less than 128-bit, you need to obtainand install a high encryption upgrade from the Microsoft Web site. Go tohttp://www.microsoft.com/ and search for “128-bit” or “strong encryption.”4. Download and install the upgrade.If you do not have Internet Explorer installed, or if you are not certain about theencryption level of your system, visit Microsoft’s Web site athttp://www.microsoft.com/ to install a service pack that provides 128-bitencryption.Note The Clients support certificate key lengths of up to 4096 bits. Ensure thatthe bit lengths of your Certificate Authority root and intermediate certificates, andthose of your server certificates, do not exceed the bit length your Clients support,or connection may fail.About Root CertificatesSee “Installing Root Certificates on the Clients” on page 89 for information aboutroot certificates.Important All secure systems need to be maintained. Ensure that you apply anyservice packs or upgrades that Microsoft recommends.