Zbrush 2021 update Keyshot Bridge issue

Zbrush 2021 update Keyshot Bridge bug

Hi all,
I have an issue with the KeyShot Bridge.
When I sending a model to KeyShot using the ZBrush to KeyShot Bridge I receive an error that says “Unable to Connect to External Renderer.”
I use Win 10 pro, 64 bit and followed these steps,


1. Disable your antivirus software. This includes Windows Defender. Failure to follow this step will often result in a corrupted installer that fails partway through installation.

8. If you have the ZBrush to KeyShot Bridge, run it and activate as well.
9. Enable your antivirus software again.

Problem in Win 10 Pro, 64 bit, - there is no button to turn off Microsoft Defender.

Compromise solution, if I open Keyshot manually before I send a model to Keyshot then everything works as expected, unfortunately the solution is not entirely correct.

Does anyone have a solution?

I thank you for your efforts,

Hi @Morgaine

First of all, see Unable to Connect to External Renderer.

Then watch the video. If none of that works, then you will need to Start a Support Conversation.

1 Like

Many thanks ZBER2 for the link!

On my PC there was no chance to go first two ways in the vid but
the way over the Registry Editor works for me !!! :slight_smile:

Open Start.
Search for regedit and click the top result to open the Registry Editor.

Browse the following path:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender

Quick tip: You can now copy and paste the path in the Registry’s address bar to quickly jump to the key destination.

Right-click the Windows Defender (folder) key, select New, and click on DWORD (32-bit)

** Name the key DisableAntiSpyware and press Enter .*
** Double-click the newly created DWORD and change the value from 0 to 1 .*

…the bad boy was the defender :wink:

Keyshot and the ZBrush bridge now works properly in both directions :+1: :+1: :+1:

Thanks again ZBER2 and Happy ZBrushing