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Error: SSL Error 61: You have not chosen to trust "Certificate Authority Signer", the issuer of the server's security certificate

Problem

This error may occur when a Citrix Receiver (ICA) Windows client system connects to a Citrix server with SHA-256 SSL certificate installed.

Error: SSL Error 61: You have not chosen to trust "Certificate Authority Signer", the issuer of the server's security certificate

Cause

The Citrix Receiver (ICA) installed on a Windows client system does not support SHA-256 signature algorithm and need to be updated.

Solution

To resolve this issue, the Citrix Receiver (ICA) on Windows client system must be running "Receiver for Windows 3.4."

For more information about Citrix Receiver for Windows 3.4, visit Citrix product documentation website. 

http://support.citrix.com/proddocs/topic/receiver-windows-34/receiver-windows-34-about.html