Authenticating with SSLv3 will be disabled in Citrix Receivers starting in the fall of 2014 because of the protocol flaw recently discovered in October. See CTX200238 - Citrix Security Advisory for CVE-2014-3566 - SSLv3 Protocol Flaw. 
Connections configured to use TLS 1.1/1.2 might not work for Citrix users.

To ensure Citrix users can continue to connect, confirm that TLS 1.0 only is enabled in the SSL protocol settings used for the connection. See CTX104182 - Receiver - Client Feature Matrix.

SSLv3 authentication is disabled after the following versions of Receiver:

• Receiver for iOS 5.9.2

• Receiver for Android 3.6

• Receiver for Mac 11.9

• Receiver for Windows 4.2