VDI and infrastructure troubleshooting: operator-reported incidents, documentation-based guides, and practical investigation worksheets. Evidence and limitations are stated in each article.
Preparation date: September 17, 2026. Scope: This is a documentation-based implementation and verification guide, not a claim about a completed customer incident. It covers ordinary Proxmox VE VZDump backups written to NAS storage. A Proxmox Backup Server datastore is a different architecture and is called out separately. The short answer is: choose NFS when Proxmox is the main consumer and your NAS can restrict the export to the Proxmox node addresses. Choose SMB/CIFS when the same share must also fit a Windows-oriented operating model or your NAS administration is already built around named users and SMB permissions. The protocol choice matters, but the restore test matters more. A green backup task proves that an archive was written; it does not prove that you can recover a VM on replacement storage. Proxmox backup to NAS verification flow A Proxmox node writes a VZDump backup over NFS or SMB to a NAS, then a separate restore test validates recovery. ...
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Horizon USB Redirection: Working vs. Failing Subnet Evidence Worksheet
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Original troubleshooting diagram created for this article.
Purpose: Use this worksheet to hand a subnet-specific Horizon USB problem to the network and desktop teams with comparable evidence. It complements the USB redirection troubleshooting guide; it is not a second account of the same incident.
This is an unfilled investigation worksheet, not a completed field test. Its value is the comparison structure: the same user, endpoint, peripheral, and desktop pool, with only the network location changed where possible. Do not report an unperformed check as passed.
1. Establish the comparison
Record
Working location A
Failing location B
Test timestamp and timezone
Record actual time
Record actual time
Endpoint, Client version, USB component
Record installed configuration
Confirm identical or explain difference
Peripheral and connection method
Record device identifier and hub use
Use the same device and hub arrangement
Test account, pool, Agent version
Record a sanitized identifier
Confirm same pool and account
Path and selected display protocol
Direct, tunneled, or UAG; actual protocol
Document any path difference
Applied USB policy
Record effective policy evidence
Record effective policy evidence
Observed result
Menu visibility, guest visibility, device function
Identify the first stage that differs
If A and B also use different client versions, devices, users, or gateways, mark the comparison as confounded. It can still help narrow the problem, but it does not isolate the subnet. Do not request a broad firewall exception from that result alone.
2. Give the network team a flow, not a port shopping list
For each suspected blocked flow, record the initiating component, destination component, transport, destination port, attempted time, and matching allow/deny evidence. Build this from the Omnissa Horizon port tables for your route and release. USB traffic can use different paths depending on tunneling and configuration; a working display session does not settle the USB question.
The older 2206 USB network-traffic documentation describes the direct-connection TCP 32111 case. Treat it as version-scoped documentation, not a command to expose that port on every device or gateway.
3. Interpret the evidence
Effective policy differs: send the policy results and location conditions to the desktop-policy owner. A blocked device class is not fixed by opening network ports.
A required flow has a matching deny: ask the network owner for a narrowly scoped test change with an expiry or rollback plan.
Both locations fail with the same peripheral: shift investigation toward device support, installed USB components, and the desktop configuration.
Device appears but the business operation fails: record the failed operation and application error. Enumeration alone does not prove usable redirection.
4. Hand over a change and verification record
Include the evidence filenames, one proposed correction, change owner, approval reference, original setting, and rollback trigger. After the correction, repeat the previously failing business operation from B, reconnect, and repeat the known-good test from A. Record actual results and the observation interval. If unrelated devices become available or access broadens beyond the approved scope, roll back and review the policy.
Keep raw packet captures and internal addresses in the restricted incident system. The public knowledge note should contain only sanitized findings. A completed comparison that rules out one layer is useful even when root cause remains unknown; label the remaining uncertainty instead of filling it with a plausible story.
vdpConnect_Failure is a starting symptom, not a root-cause diagnosis. Before reinstalling Horizon Agent or opening firewall ports, establish whether the failure occurs during authentication, desktop launch, or an established session. This documentation-based triage guide does not report a reproduced incident or a universal fix. Corrected September 12, 2026: The earlier guide suggested restarting the Windows RPC service and treated a local netstat listing as a test for blocked ports. Those instructions have been removed. A socket listing does not demonstrate end-to-end reachability. Classify the failure before making changes Observation First evidence to collect Avoid assuming Authentication never completes Exact login error, identity provider or broker event, timestamp That the display protocol is the failing component. Desktop selection succeeds, launch fails Assigned desktop, chosen protocol, Client/Agent and gateway logs That a successful HTTPS login proves the session path ...
Start an “Agent Unreachable” investigation by separating desktop health, Agent registration, and session traffic. Do not begin with a pool rebuild. This documentation-based triage guide helps decide which team should act and what evidence to preserve. Correction, September 12, 2026: The earlier guide mixed display ports with Agent communication, tested Blast against the Connection Server, and offered generic service restarts and image rebuilds. Those instructions have been replaced with path-specific investigation. First-response decision table Check Evidence Investigation owner Is the guest responsive? Approved console access, OS health, resource and disk observations Desktop/virtualization team if the OS is unavailable. Is this one desktop or a whole image family? Affected pool, image revision, Agent version, start time Image owner if failures align with a deployment. Does registration fail? Agent and Connection Server events for the same desktop and time Horizon team, then netw...
A desktop can authenticate successfully and still fail to establish its display session. This guide investigates that handoff. Use it after identifying the actual console/client error, not as a claim that every “Protocol Error” means a firewall failure. Correction, September 12, 2026: The previous version combined a general checklist with an unverified incident narrative, conflated gateway and desktop port directions, and recommended blanket endpoint-security exclusions. Those instructions have been removed. This is a documentation-based diagnostic plan. Draw the attempted connection Record the selected protocol, assigned desktop, Client and Agent versions, gateway route, and attempt time. Distinguish a direct internal connection from an external UAG connection or a Connection Server tunnel. Use Omnissa's connection guide to identify where the failed handoff occurs. Stage Question Useful comparison Authentication Did the user receive desktop entitlement? Failed login versus ...
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