RC4, SSLv3, and TLSv1.0 are disabled by default in Horizon 7 components. If you need to reenable RC4, SSLv3, or TLSv1.0 on a virtual desktop or published desktop, see "Older Protocols and Ciphers Disabled in Horizon 7" in the Horizon 7 Security document.
For complete information about the security features of View Agent, Horizon Agent, and Horizon Client, see the Horizon Client and Agent Security document.