Hello Gregory,

Can you check to see if you have the Graphics Acceleration option enabled on the client settings, if so disable this option and then test to see if you no longer get the 'Prototcol Error' message.

This is currently a known issue that is being investigated and is detailed under the Known Issues section of the vWorkspace 7.1 MR1 Release Notes.

Let me know if you have further questions about this.

They're connecting using the Secure Access gateway. Is there a way to configure this from the server? or via Group Policy?

The setting can be enabled/disabled on the Web Access server, when logging into the admin page. Select the User Experience tab and then the Performance option, there you will see the Graphics Acceleration check box. You can chose to enforce this setting for all users by disabling the 'Allow user to override the performance settings' check box.

Excellent and many thanks! I have implemented the change and will followup to let you know if this resolved the issue.

Have disabled:

As EOP was already disabled at the application level on the connection brokers, and based on other research, I believe it's likely to be the "Bitmap Caching" setting.

No joy - still having this issue. 

Reply to the original response so you get pinged

Continued no joy. Same message if using the MR1 fat client; especially when minimizing / maximizing the application. We're using seamless windows to present the apps.

We experience the same problem. XStream is off. Running 7.1 MR1. This is not a TCP timeout issue as this only occurs on a specific terminal server. Other terminal servers published through the same SSL gateway are fine. Hopefully there will be a solution soon..

Frans