1Y0-A05 XenApp Study Guide Part 3
1Y0-A05 XenApp Study Guide Part 3
1Y0-A05 XenApp Study Guide Part 3
Configuring ICA Sessions
ICASession Policies
To allow some users in a company to have more sessions running than the server farm is configured to allow:
* Create a new policy in XenApp and add the policy ruleUser Workspace >Connections >Limit total concurrent sessions.
* Configure the sessions to as many as needed and apply the policy to the desired users or groups.
The audio rules available in theClient Devices >Resources >Audio folder for XenApp policies are:
* Microphones
Allows microphones on client devices to be used in a session.
* Sound Quality
Configures the maximum allowable client audio quality per session.
* Turn off speakers
Disables audio mapping to client speakers.
To configurePDA synchronization using USB-tethering:
* Enable the policy ruleTurn on automatic virtual COM port mapping.
This rule allows USB to virtual COM port emulation in client sessions.
This rule is found in a policy atClient Devices >Resources >PDA Devices.
In theUser Workspace folder of a XenApp policy, an administrator can configure:
* Connections
IncludingLimit total concurrent sessions andZone preference and failover.
* Server-to-client content redirection
* Shadowing
Including configuration and permissions.
* Time Zones
IncludingDo not estimate local time for legacy clients andDo not use Client's local time.
* Citrix Password Manager
IncludingCentral Credential Store andDo not use Citrix Password Manager.
Streamed Application
IncludingConfigure delivery protocol. Specifies the application delivery method used to stream applications to the desktops of client devices or servers.
An administrator can configure the required SecureICA encryption level per session in:
* Security >Encryption >SecureICA encryption
This is the only encryption rule available in a XenApp policy.
Maintain Plugins
TheCitrix XenApp Plugin allows users to access all of their published resources in a familiar Windows desktop environment.
* Users work with published resources the same way they work with local applications and files.
* Published resources are represented throughout the client desktop, including the Start Menu and Windows notification area, by icons that behave just like local icons.
* You configure the Citrix XenApp Plugin using a Citrix XenApp site created in the Access Management Console.
The plugin is associated with the site for the Web Interface server.
If you want the users to be prompted for authentication to a XenApp server every time, selectNo when configuring pass-through authentication during XenApp Plugin installation.
When configuring the XenApp Plugin:
* Depending on whether you are connecting to a secure connection or not, type the name of the server hosting the XenApp Services site in one of these formats:
http://servername
Not secure.
Replaceservername with thename of the Web Interface server.
https://servername
Secured by Secure HTTP.
Replaceservername with thename of the Web Interface server.
XenApp Web Plugin:
* It is a smaller client that can be installed fromXenAppWeb.msi orXenAppWeb.exe.
* The XenApp Web Plugin setup files are significantly smaller than the other clients.
The small size allows users to quickly download and install the client software.
* Users access the published resources by clicking on links from a Web page or corporate intranet.
The Web Client does not require user configuration and does not have a user interface.
The XenApp Web Plugin can automatically be installed on the client devices before users try to use the Web Interface. To configure automatic deployment of the XenApp Web Plugin:
* Create a home page andrun an Internet Explorer script to download theXenAppWeb.exe package automatically from the web server and install it for the user.
Program Neighborhood:
* Supports the full XenApp feature set and it requires user configuration and maintenance.
* Choose Program Neighborhood if you do not want to publish your resources using Web Interface.
If you choose to implement the Web Interface at a later time, Program Neighborhood users can also access resources published through Web Interface.
* Enable Quick Launch Bar andEnable Custom ICA Connections are both configuration choices for Program Neighborhood.
While creating aProgram Neighborhood package:
* To help ensure duplicate client names do not exist on the network, use a name different for the client than the computer name by choosingSpecify a client name.
* To let users open sessions without entering their username and password, chooseUse Kerberos only to enable pass-through authentication.
* To allow users to make server connections without using theICAConnection Wizard, chooseEnable Quick Launch Bar.
* To ensure older client versions are overwritten with newer clients, leave the default client replacement option chosen, which isAllow upgrade if package is newer than existing client version.
Administrators can useActive Directory to deploy clients using the .MSI file on the installation media or using a custom client file package created withClient Packager.
To deploy the Citrix XenApp Plugin software using an MSI package via Client Packager toWindows 2000 Professional computers using Active Directory:
* Windows Installer 3.0 Redistributable for Windows must be installed.
* Windows XP, Windows Vista, Windows Server 2003 and Windows Server 2008 already have the supported Windows Installer by default.
When creating a package with theClient Packager:
* The default client name option isUse machine name as client name.
* The other client name option isLet users specify a client name.
By choosingNo on thePass-Through Authentication screen, the administrator would make sure that the users must enter their username and password to log on to sessions.
By default, Citrix plugins get thesame name as the machine at deployment.
To assign a client package to an Organizational Unit (OU):
* Create a network share and copy the .MSI file containing the client to the network share location.
* InActive Directory Users and Computers, right-click the appropriateOU and clickProperties.
* Click theGroup Policy tab and clickNew to create a new Group Policy.
* Type the name for the Group Policy, pressEnter and clickEdit.
* Navigate toComputer Configuration >Software Settings >Software Installation.
* Right-click the blank area in the right pane and clickNew >Package.
* Locate the client package on the network share and clickOpen.
* ClickAssigned in theDeploy Software dialog and clickOK.
As the clientrestarts, Active Directory Group Policyautomatically installs the client on the computer.
After deploying a client package via Active Directory and restarting the client device, theadministrator should log in to the client device toverify that the client is installed.
Configure Display Settings
An administrator can improve WAN performance:
* By configuring the display settings that control bandwidth usage of graphics that are transferred to the client.
The display settings can be configured for use by the entire farm or for a specific server.
Configure display settings at the server or farm level:
* Discard queued image that is replaced by another image
Graphics that are immediately replaced by other graphics will not be sent.
* Cache image to make scrolling smoother
Sections of bitmap graphics will be retrieved from the client cache to make pages scroll more smoothly.
* Maximum memory to use for the graphics in each session
Limits the size of the memory buffer each client connection uses.
Ifmultiple monitors are being used, this setting should be set to themaximum.
* Degrade resolution first
Lowers the resolution to accommodate the memory buffer limit before lowering the color depth.
* Notify user of session degradation
A message will be displayed on the user's client device when the session is degraded as a result of the memory buffer limit being exceeded or the client device being unable to support the requested parameters.
TWCONFIG can be used to set the maximum amount of memory used for session graphics on a server.
SpeedScreen
SpeedScreen Latency Reduction Manager provides mouse click feedback and local text echo to reduce the user's perception of latency when typing and clicking.
SpeedScreen Browser Acceleration optimizes the responsiveness of graphics-rich HTML pages in published versions of Microsoft Outlook, Outlook Express and Internet Explorer.
* To further accelerate the accessibility of Web pages and email using SpeedScreen Browser Acceleration
JPEG compression can be enabled.
JPEG compression offers a trade-off between the quality of the JPEG images as they appear on the client devices and the amount of bandwidth the files consume transferring from server-to-client.
JPEG image acceleration results in slightly lower image resolution and slightly higher resource consumption on both server and client. When enabled, select the image compression level:Low,Medium orHigh or selectAdjust compression level based on available bandwidth.
SpeedScreen Browser Acceleration is enabled by default at the farm level. It can be customized at the farm or server level.
SpeedScreen Multimedia Acceleration allows you to control and optimize the way XenApp passes streaming audio and video to users.
SpeedScreen Flash Acceleration allows you to control and optimize the way XenApp passes Macromedia Flash animations to users.
SpeedScreen Image Acceleration offers you a trade-off between the quality of photographic image files as they appear on client devices and the amount of bandwidth the files consume on their way from the server to the client.
* SpeedScreen Image Acceleration is the only SpeedScreen technology that is configured in a XenApp policy.
To configure SpeedScreen Image Acceleration:
Create a new policy using theXenApp Advanced Configuration tool
Expand theBandwidth folder.
Expand theSpeedScreen folder and click theImage acceleration using lossy compression node.
In the right pane, enable it.
Set theImage Acceleration compression level
Set bandwidth restrictions
Set theProgressive Display compression level
Determine whether to useHeavyweight compression
ClickOK and apply the policy using a policy filter.
SpeedScreen Progressive Display allows you to improve interactivity when displaying high-detail images by temporarily increasing the level of compression (decreasing the quality) of such an image when it is first transmitted over a limited bandwidth connection, to provide a fast (but low quality) initial display.
* If the image is not immediately changed or overwritten by the application, it is then improved in the background to produce the normal quality image, as defined by the normal lossy compression level.
Heavyweight compression allows you to increase the compression of the SpeedScreen Image Acceleration and SpeedScreen Progressive Display without impacting image quality.
* Because heavyweight compression isCPU intensive and affects server scalability, it is recommended for use only withlow bandwidth connections.
Bandwidth Policy
In a policy, bandwidth can be configured by either:
* Kilobytes per second
The bandwidth rules for kilobytes per second are configured in theSession Limitsfolder.
* Percentage
The bandwidth rules for percentage are found in theSession Limits (%) folder.
In order for a bandwidth rule to work as a percentage in a policy, the administrator must also configure theOverall Session rule in theSession Limits (%) folder.
If the same rule is set with a fixed value inSession Limits and a percentage value inSession Limits (%), themost restrictive rule (that is, the lower value) is the one that isapplied.
* For example, if the maximum amount of bandwidth usage was configured for 250Kbps andAudio was configured with both a fixed value of60Kbps and a percentage of20% (or 50Kbps), the 50Kbps would be used since it is the lower, or more restrictive, setting.
If an administrator is concerned about bandwidth and needs to create a policy or policies to help contend with bandwidth issues, there are many policy rules that can be configured. In theBandwidth folder of a XenApp policy, the administrator can configure:
* Visual effects
Turn off desktop wallpaper
Turn off animations
Turn off windows content while dragging
* SpeedScreen Image Acceleration using lossy compression
* Session limits
Including the maximum bandwidth to use for:
Client audio
Client clipboard mapping
Client COM and LPT port mapping
Client drive access
OEM virtual channels
Overall client session
Printing Printing bandwidth can be limited throughserver properties or with apolicy rule.
TWAIN driver redirection
To cut down on the bandwidth used for audio in an audio-enabled application:
* Create a XenApp policy.
* Enable theSound Quality rule in:
TheClient Devices >Resources >Audio folder.
Limit theAudio bandwidth per session to desired level.
Session Reliability
Session reliability:
* Keeps sessions active on the user's screen when network connectivity is interrupted.
Users continue to see the application they are using until network connectivity resumes, but the display freezes and the cursor changes to a spinning hourglass.
* The advantage is that when network connectivity resumes, they don't have to reconnect to the application.
* To enable session reliability, chooseAllow users to view sessions during broken connection in theSession Reliability settings.
* Disable it by deselectingAllow users to view sessions during a broken connection.
* Change the port number in thePort number field
* Change the amount of time sessions remain active when connectivity is lost in theSeconds to keep sessions active field.
* If an administrator wants users to re-authenticate before reconnecting to active sessions,Auto-client reconnect should be enabled.
* When session reliability is enabled,Keep Alive settings are not used even when they are configured in the server farm.
Session reliability isprovided by the Citrix XTE Service through the Common Gateway Protocol on port 2598.
Auto-Client Reconnect
Auto-client reconnect allows the following clients to detect broken connections and automatically reconnect users to disconnected sessions:
* Client for Windows
* Client for Java
* Client for Windows CE
When a client detects an involuntary disconnection of a session, itattempts to reconnectthe user to the sessionuntil there is a successful reconnection or theuser cancels the reconnection attempts.
ICAKeep-Alive
ICAKeep-Alive is a setting used to manage the states of the ICA sessions to ensure that they are accurately reported.
When ICA Keep-Alive is configured:
* Packets are sent to each client device to determine whether a connection still exists.
If the client device does not respond, the state of the session using the connection is changed fromActive toDisconnected.
SmoothRoaming
SmoothRoaming allows a user to disconnect from one ICA session andreconnect from another device to continue thatsame session.
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