Troubleshooting VMware Horizon Client vdpConnect_Failure Issue
Introduction
VMware Horizon Client is a widely used solution for virtual desktop infrastructure (VDI). However, users may encounter various connection issues, one of which is the vdpConnect_Failure error. This error often results in a black screen followed by a disconnection, preventing users from accessing their virtual desktop. In this article, we will explore the possible causes of this issue and provide step-by-step solutions to resolve it.
Common Causes of vdpConnect_Failure
1. RPC Server Unavailable
One of the most common reasons for vdpConnect_Failure is the unavailability of the Remote Procedure Call (RPC) server. This can occur due to:
The RPC service being stopped or disabled
Network issues preventing communication with the server
Firewall blocking required ports
2. Display Protocol Issues (Blast/PCoIP/RDP)
Horizon Client uses different display protocols such as Blast, PCoIP, or RDP. If there are misconfigurations or compatibility issues with the selected protocol, the connection may fail.
3. Network or Firewall Restrictions
Horizon Client requires specific ports to be open for successful communication. If firewalls or security policies block these ports, the connection will fail.
4. Corrupt or Outdated VMware Horizon Agent
An outdated or corrupt Horizon Agent on the virtual desktop can lead to connectivity failures. Ensuring that the agent is properly installed and up-to-date is essential.
5. Authentication and Security Issues
Mismatched authentication settings between the client and the server can prevent a successful connection. Multi-Factor Authentication (MFA), certificate issues, or group policy restrictions may contribute to this problem.
6. Insufficient Virtual Machine Resources
If the virtual desktop lacks sufficient CPU, RAM, or GPU resources, it may not be able to handle the connection request, leading to failures.
Step-by-Step Solutions
✅ 1. Check RPC Service Status
Open Run (Win + R) and type
services.msc, then press Enter.Locate Remote Procedure Call (RPC) in the list.
Ensure the service is running and set to Automatic.
Restart the service if necessary.
✅ 2. Verify Display Protocol Configuration
Open VMware Horizon Client.
Before connecting, click on the settings (gear icon) and check the default display protocol.
Try switching between PCoIP, Blast, and RDP to see if the issue persists.
If using Blast, ensure that the VMware Blast Service is running on the virtual desktop.
✅ 3. Check Firewall and Network Settings
Ensure the following ports are open on the client, virtual desktop, and connection server:
| Protocol | Port | Description |
|---|---|---|
| TCP | 443 | HTTPS (Horizon Connection Server) |
| TCP | 4172 | PCoIP display protocol |
| UDP | 4172 | PCoIP display protocol |
| TCP | 8443 | VMware Blast (HTML5 Access) |
| TCP | 3389 | RDP (if applicable) |
| TCP | 135 | RPC communication |
Run the following command to check if ports are blocked:
netstat -an | find "4172"If necessary, create firewall rules to allow traffic through these ports.
✅ 4. Restart VMware Horizon Agent on Virtual Desktop
Open Run (Win + R) and type
services.msc, then press Enter.Locate VMware Horizon View Agent.
Restart the service and retry the connection.
If restarting does not help, consider reinstalling the Horizon Agent on the VM.
✅ 5. Check Virtual Machine (VM) Health
Open vCenter and select the virtual desktop.
Check CPU and RAM usage.
Ensure that VMware Tools and the Horizon Agent are installed and running.
If necessary, increase VM resources (CPU, RAM, GPU).
✅ 6. Review Log Files for Detailed Errors
Check the following logs for additional insights:
Horizon Agent logs:
C:\ProgramData\VMware\VDM\logs\debug.logVMware Client logs:
C:\Users\<Username>\AppData\Local\VMware\VDM\logsESXi/Host logs:
/var/log/vmkwarning.log,/var/log/hostd.log
Look for errors related to vdpConnect_Failure or RPC Server Unavailable and troubleshoot accordingly.
Conclusion
The vdpConnect_Failure error in VMware Horizon Client can be frustrating, but by systematically troubleshooting the RPC service, network settings, display protocols, firewall configurations, and VM health, you can resolve the issue efficiently. If the problem persists, reviewing the logs will provide deeper insights into the root cause.
By following the steps outlined in this guide, you should be able to restore connectivity and access your virtual desktop seamlessly. If you need further assistance, consider reaching out to VMware support or checking the latest VMware documentation for updates.
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