HP mt40 Mobile Thin Client Troubleshooting
HP Velocity FAQ and
Troubleshooting
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Fourth Edition: May 2013
First Edition: June 2012
Document Part Number: 689305-004
Contents
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
About this document 5
Purpose. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Intended audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Document styles and conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
For more information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
HP Velocity FAQ 7
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
How does HP Velocity improve the user Quality of Experience (QoE)?. . . . . . . . . . . . . . . . . . . . 7
Does HP Velocity introduce latency? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
What is HP Velocity’s impact on available bandwidth? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
What is an HP Velocity-protected flow? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
What is an HP Velocity-monitored flow?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
What is the maximum number of supported HP Velocity flows?. . . . . . . . . . . . . . . . . . . . . . . . . . 9
What is the purpose of policy filters? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
What is the LiveQ - Packet Loss Protection Optimizer? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
What is the LiveTCP - Flow Control Optimizer? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
What is LiveTCP - Latency Mitigation? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
What is the LiveWiFi Optimizer?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
What is the Target Loss Rate (TLR)? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
What is Burst Loss Protection (BLP)?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
How does HP Velocity provide congestion avoidance? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
How does HP Velocity provide congestion control? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Installation and deployment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Which platforms and operating systems are supported by the HP Velocity server component? 11
What are the system requirements for the HP Velocity server component?. . . . . . . . . . . . . . . . 12
Where should HP Velocity be installed? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Which HP Velocity server installation package should be used? . . . . . . . . . . . . . . . . . . . . . . . . 12
Why does the “Another version of this product is already installed” message appear? . . . . . . . 13
Why does the “Do you want to allow the following program from an unknown publisher to make
changes to your system” message appear? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Why does a message about a driver that has not passed Windows Logo Compatibility testing
appear?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
What configurations must be applied to HP Velocity? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
What do the colors of the HP Velocity system tray icon represent? . . . . . . . . . . . . . . . . . . . . . . 14
How is HP Velocity managed? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Why is Save Log History grayed out on the Network Statistics tab? . . . . . . . . . . . . . . . . . . . . . 15
On the Flow Information tab, why are some protocol names listed and others not? . . . . . . . . . 15
What do the red and green bars on the Network Monitor graph represent?. . . . . . . . . . . . . . . . 15
How are Group Policy settings applied? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
What are the account privileges for HP Velocity?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Protected flows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
All HP Velocity data flows are blocked . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Traffic between HP Velocity servers is only monitored . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
An RDP connection is not established to Microsoft Hyper-V when HP Velocity is enabled (Protect or
Monitor mode). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
A network connection is not established to an HP Velocity server that uses a Broadcom teaming
interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
No protected flows are established for connections to a VMware desktop with HP Velocity installed
19
HP Velocity troubleshooting 20
VDI connectivity issue. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Non-VDI connectivity issue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
HP Velocity-protected flows not established. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Quality of Experience - packet-loss issue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Quality of Experience - latency issue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Troubleshooting procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Disabling HP Velocity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Enabling HP Velocity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Displaying loss without Velocity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Displaying loss with Velocity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Displaying Target Loss Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Displaying latency mitigation configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Displaying flow information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Adding an IP address to the policy filter blacklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Adding a port to the transparent policy filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Validating HP Velocity deployment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Checking the traffic path for a security server or firewall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Generating the HP Velocity Configuration Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
About this document
Purpose
This document provides FAQ and troubleshooting information for HP Velocity.
Intended audience
This document is intended for HP support staff and customer IT personnel.
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HP Velocity FAQ and Troubleshooting Guide 5
About this document For more information
For more information
This document is part of a set of documents about HP Velocity. The following documents are
part of the HP Velocity documentation set:
• HP Velocity Technology Overview: This document provides a high-level overview of
HP Velocity technology, components, and features.
• HP Velocity User Guide: This document describes how to start, monitor, and display
information about HP Velocity.
• HP Velocity Server Side Deployment Guide: This document describes deployment
scenarios and installation methods for HP Velocity, procedures for creating a custom
HP Velocity configuration, and procedures for using the Management Application.
• HP Velocity FAQ and Troubleshooting Guide: This document provides FAQ and
troubleshooting information for HP Velocity.
HP Velocity FAQ and Troubleshooting Guide 6
HP Velocity FAQ
This chapter covers the following FAQ categories:
• General
• Installation and deployment
• Management
• Protected flows
General
This section provides answers to the following FAQs:
• How does HP Velocity improve the user Quality of Experience (QoE)?
• Does HP Velocity introduce latency?
• What is HP Velocity’s impact on available bandwidth?
• What is an HP Velocity-protected flow?
• What is an HP Velocity-monitored flow?
• What is the maximum number of supported HP Velocity flows?
• What is the purpose of policy filters?
• What is the LiveQ - Packet Loss Protection Optimizer?
• What is the LiveTCP - Flow Control Optimizer?
• What is LiveTCP - Latency Mitigation?
• What is the LiveWiFi Optimizer?
• What is the Target Loss Rate (TLR)?
• What is Burst Loss Protection (BLP)?
• How does HP Velocity provide congestion avoidance?
• How does HP Velocity provide congestion control?
How does HP Velocity improve the user Quality of Experience (QoE)?
HP Velocity integrates with existing systems and addresses the underlying problems found in
today's networks: packet loss, transmission latency, and jitter.
HP Velocity continuously monitors end-to-end network conditions to select the most
appropriate data delivery mechanism. Packet loss is automatically reduced and transmission
latency is minimized, thereby improving an application's QoE and throughput.
HP Velocity FAQ and Troubleshooting Guide 7
HP Velocity FAQ General
HP Velocity boosts application QoE in a high-latency environment. By actively adapting TCP,
HP Velocity automatically calibrates congestion control parameters for each TCP flow based
on the conditions present in the network.
Does HP Velocity introduce latency?
No, HP Velocity provides zero-latency loss protection.
What is HP Velocity’s impact on available bandwidth?
The bandwidth control mode defines how network flows are protected from network loss.
Higher protection modes protect against a greater network loss but also require more
bandwidth.
HP Velocity provides the following bandwidth control modes:
• Dynamic: Configures HP Velocity to dynamically maximize acceleration while optimizing
bandwidth usage.
• Low: Configures HP Velocity to cap the estimated protection overhead at or below 27%.
This mode is best suited to very constrained environments.
• Medium: Configures HP Velocity to cap the estimated protection overhead at or below 40%.
This mode is best suited to moderately constrained environments.
• High: Configures HP Velocity to maximize performance in environments where bandwidth is
not constrained and the network loss is known to be high. This mode is best suited to highloss networks.
NOTE: Protection overhead bandwidth refers to the amount of additional
bandwidth required for each encoding mode HP Velocity uses to protect
against packet loss. For more information, see the “Packet loss protection”
section of the HP Velocity Technology Overview document.
What is an HP Velocity-protected flow?
A protected flow is formed between two HP Velocity endpoints in Protect mode. In this mode,
HP Velocity continuously monitors end-to-end network conditions to activate and adjust
HP Velocity optimizers, such as zero-latency loss protection, WiFi acceleration, TCP flow
control, and latency mitigation.
HP Velocity FAQ and Troubleshooting Guide 8
HP Velocity FAQ General
What is an HP Velocity-monitored flow?
A monitored flow is formed between two HP Velocity endpoints in Monitor mode. In this mode,
HP Velocity continuously monitors end-to-end network conditions but does not activate or
adjust HP Velocity optimizers, such as zero-latency loss protection, WiFi acceleration, TCP
flow control, and latency mitigation.
What is the maximum number of supported HP Velocity flows?
HP Velocity supports simultaneously protected flows as follows:
• An HP thin client supports 16 to 1024 simultaneously protected flows.
• HP Velocity installed on a virtual desktop supports 16 to 1024 simultaneously protected
flows with one or more HP thin clients.
• HP Velocity installed on a terminal services server supports 256 to 1024 simultaneously
protected flows with one or more HP thin clients.
HP Velocity defaults to the minimum number of supported simultaneous sessions. If the
default setting is changed, reboot the system for the change to take effect.
What is the purpose of policy filters?
The policy filters define which data flows to protect and the level of protection to apply, based
on the configured IP addresses and ports. For more information, see the “Policy Filters”
section of the HP Velocity Server Side Deployment Guide.
What is the LiveQ - Packet Loss Protection Optimizer?
HP Velocity provides zero-latency loss protection from end-to-end packet loss. HP Velocity
protects application flows from packet loss by automatically adapting the amount of added
redundancy.
What is the LiveTCP - Flow Control Optimizer?
HP Velocity improves the throughput of applications like multimedia streaming and remote
desktop access by modifying TCP flow control mechanisms to perform better in WiFi
environments.
What is LiveTCP - Latency Mitigation?
HP Velocity optimizes TCP throughput over all networks and provides latency mitigation for
RDP, RGS, and ICA protocols. HP Velocity optimizes the throughput of applications like
HP Velocity FAQ and Troubleshooting Guide 9
HP Velocity FAQ General
multimedia streaming and remote desktop by modifying TCP flow control mechanisms to
perform better in high-latency environments.
What is the LiveWiFi Optimizer?
HP Velocity accelerates application flows by leveraging WiFi multimedia standards to minimize
latency and prioritize HP Velocity traffic.
What is the Target Loss Rate (TLR)?
The Target Loss Rate (TLR) is the amount of loss that a thin-client application can tolerate
while still delivering an acceptable QoE. HP Velocity adjusts its operation to ensure that each
application is protected from experiencing too much packet loss. The default and
recommended TLR for thin-client applications is 0.04%.
What is Burst Loss Protection (BLP)?
Burst loss, also known as sequential loss, normally prevents HP Velocity from reconstructing
the source packet at the remote endpoint. To mitigate sequential loss, HP Velocity offers the
Burst Loss Protection (BLP) feature.
The net effect of BLP is added resiliency against burst loss. Its success depends on the
number of source packets that are HP Velocity-encoded and the sequential loss duration.
How does HP Velocity provide congestion avoidance?
HP Velocity provides congestion avoidance by analyzing network links. When it detects a link
with bandwidth constraints, it automatically adjusts protection to accommodate those
constraints.
How does HP Velocity provide congestion control?
Congestion control is provided by the LiveTCP Optimizer, which improves on native TCP by
automatically accelerating the speed at which thin-client protocols (RDP, RGS, and ICA)
transmit data.
HP Velocity FAQ and Troubleshooting Guide 10
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