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VDPCONNECT_FAILURE when launching Desktops


Super6VCA

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What protocol are you using?  Are users on your internal network or external and connecting through a UAG? 

Sean Massey
Independent Consultant/Analyst/Blogger | VCDX-EUC 247
Vice Chairman of the Board - World of EUC
Blog: thevirtualhorizon.com  Mastodon: @seanpmassey@vmst.io Instagram/Thread:
@seanpmassey LI: https://www.linkedin.com/in/seanpmassey/

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I have seen the same issue. Our case was that UDP was blocked on the external facing firewall.

- are your servers behind a load balancer?
- Are all network ports opened in the firewall? Double-check if the UDP port 8443 is not blocked by the firewall.

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I agree with @Niels Geursen.  This sounds like a network port isn't opened between the client and agent. 

Is this only happening with the new pools?  Or is this happening with existing pools?  If it's just new pools, has anything changed in your network architecture such as adding a new subnet for the new desktops?

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Sean Massey
Independent Consultant/Analyst/Blogger | VCDX-EUC 247
Vice Chairman of the Board - World of EUC
Blog: thevirtualhorizon.com  Mastodon: @seanpmassey@vmst.io Instagram/Thread:
@seanpmassey LI: https://www.linkedin.com/in/seanpmassey/

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  • Employee

Hello, 

What are your Connection Server settings? Is Blast Secure Gateway enabled? 

If HTML works but fails with client, I suspect that you enabled 'Blast Secure Gateway for HTML access only' in the CS settings. Therefore the connection flow is different. 

with client it is:   Client > 22443 > Agent 
with HTML it is  Client> 8443 > Connection Server > 22443 > Agent. 

It is very likely that you are missing a firewall rule between client-Agent. 

Source: 'any'    or client endpoint IP range. 
Destination: VDI desktop (agent)
Port: 22443

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  • Employee

As @Victor León says, i would check the config on your Connection Servers to make sure Blast Secure Gateway is not enabled.

I normally default to using the Enable the Blast Secure Gateway for HTML Access option. See https://techzone.omnissa.com/resource/understand-and-troubleshoot-horizon-connections#configuration for more information on this.

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