When Vendors Don’t Have the Answer

  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, ...

  🖥️ VMware Horizon Agent “Protocol Error” — Fixed by Windows Firewall Configuration Overview Recently, I encountered an issue where several Horizon Agent–based virtual desktops in our environment showed the status “Starting other services” or “Protocol Error” in the Horizon Administrator console. Even after reinstalling the Agent (version 2206 ), the problem persisted. Symptoms Horizon Agent status: “Starting other services” → “Protocol error” Horizon main services appeared to be running normally Event Viewer showed Event ID 7000 for services such as: PASVC – failed to start LUFAV – not installed Reinstalling the Agent (even using Repair mode ) did not solve the issue Root Cause After deeper inspection, we discovered that on the affected VMs: Windows Defender Firewall (Domain Profile) → “Block all incoming connections, including those in the list of allowed apps” was checked (enabled). This setting silently blocks all inbound traffic , ev...

  Keywords: VMware Horizon Agent Unreachable, Omnissa Horizon Agent unreachable, Horizon View troubleshooting, Blast service issue, Horizon Agent not responding, VDI connectivity problem In VMware Horizon (now branded as Omnissa Horizon ), administrators frequently encounter the “Agent Unreachable” state in the Horizon Console. While a simple reboot often resolves the issue, persistent cases indicate deeper infrastructure, service, or network-layer problems. This guide provides a structured root-cause analysis and remediation checklist suitable for production VDI environments. What Does “Agent Unreachable” Mean? When a desktop shows Agent Unreachable , the Horizon Agent inside the VM cannot communicate with the Connection Server . The failure typically occurs in one of these control paths: Horizon Agent → Horizon Connection Server Blast Secure Gateway (BSG) → Agent Windows OS services → Horizon Agent service Firewall or network layer blocking agent heartbeat ...