Applicable Products

• Citrix Workspace App

Symptoms or Error

Citrix Workspace App For Html5 Download For Mac

This article is intended for Citrix administrators and technical teams only.
Non-admin users must contact their company’s Help Desk/IT support team and can refer to CTX297149 for more information.
When using StoreFront with or without Workspace App for HTML5 through an HTTPS URL, applications and desktops cannot be started. The following error message is displayed:

“Cannot create a secure connection in this browser. Refer to the Citrix Knowledge Center article CTX134123.”

Solution

Recommended Solution(s) for All Browsers

• Connect via Citrix Gateway even for internal connections. This would ensure connections work fine regardless of Virtual Apps or Desktops versions.
  Deploying SSL/TLS for each Virtual Delivery Agent (VDA) for direct connections. Workspace App for HTML5 supports secure direct SSL/TLS connections with XenApp/XenDesktop 7.6
  

Read the following articles from the Citrix Blog for more information:

Mozilla Firefox

There is a possible workaround for Mozilla Firefox browser.

Note: This workaround has security implications; consult the security specialist of your organization to consider the following configuration.

1. Enforce secure communications between Workspace App for HTML5 and applications or desktops (for example, using IPSec).

2. Use Mozilla Firefox only for Citrix Receiver for HTML5 (not for general website use).

3. Enforce a secure configuration for Firefox.

4. Enable the Firefox network.websocket.allowInsecureFromHTTPS option.

1. Open a new tab in the Firefox browser.

2. Type about:config in the address bar.

3. Double-click network.websocket.allowInsecureFromHTTPS and set the value to true.

Note: This Firefox option might not be supported in Citrix Receiver for HTML5 future versions.

WARNING! This option on Firefox affects the operation of entire Firefox, not just Citrix Receiver for HTML5.

Important Note

As of version 9, Safari browser allows insecure web socket connections. Internet Explorer never allowed non SSL/TLS web socket connections from HTTPS websites. Chrome used to allow it behind a flag, but after the Chrome 44 update, this is no longer supported. Firefox allows it behind a flag (as explained earlier in this article), but it is not recommended. Going forward, only secure (SSL/TLS) web socket connections can be made from Receiver for HTML5.

Problem Cause

When Workspace App for HTML5 is hosted on a https site (default and recommended), non SSL/TLS websocket connections are prohibited by browsers.
In explaining the technical reason behind this it is important to understand the following two principles:
1. As opposed to existing as a separate process, Citrix Workspace App for HTML5 operates within the frame and process space of the browser itself. As such the browser has the ability to enforce certain security parameters.

This second point is less obvious in the case of Citrix Workspace App for HTML5 because the published desktop or application displays within the browser frame and “appears” to be connected via the Storefront server. Despite this appearance though, the underlying TCP/UDP connection is still between the client and the VDA. If the Storefront base URL is SSL enabled (where it begins with https as is best practice) and the VDA is not SSL enabled (which it is not by default) the browser in this case will prevent the connection due to what it sees as an underlying inconsistency. The inconsistency is that while the URL shown in the browser frame is prefixed with https, the actual underlying connection is not https even though it is not obvious to the user.
There are two solutions for this.
Solution 1 is to enable SSL on the VDA using the following guide:

Citrix Workspace App For Html5 Download Free

Additional Resources