• libcurl.so (it should be installed with its dependent packages)
  Version: 7.18.2 or higher (latest version is recommended)

• libflashplayer.so (and its dependent binaries must be present on the system)
  Version: 10.x or higher (latest version on client device is recommended)

• Flash redirection on Linux is supported with XenDesktop 5.5 or XenApp 6.5 release running with a minimum Flash of version 10.1. Refer to XenDesktop and XenApp documentation for the same.

• To make the redirection feature compatible and smooth, ensure that the client installed Flash version to be equal or higher than the version installed on VDA.

  Example: If you have VDA running the Flash plugin 10.x, then the version present on the client should be either 10.x or 11.x (only the version major number is considered).

Verifying if Client Side Flash Re-direction is Working on Client

Note: To verify if the Flash content is being rendered on client, you must right-click on the Flash region.

• The Flash menu is similar to the native Linux menu.

• Verify using the right-click menu option and observe the "About Citrix...” which confirms that Citrix redirection logic is working (introduced in the 12.0 release).

• If you get access to terminal on the Linux device, you can verify with the following command:

  ps -ef |grep Flash
  and it should come up with the following result:
  1000 6272 6240 0 15:41 pts/6 00:00:00 sh - c /home/username/installation/icaclient/FlashContainer.bin
  /tmp/Ctx15043876389775564386240 /tmp/Ctx5646687127620733126240 6240 0
  1000 6273 6272 8 15:41 pts/6 00:00:02 /home/username/installation/icaclient/FlashContainer.bin
  /tmp/Ctx15043876389775564386240 /tmp/Ctx5646687127620733126240 6240 0

cat > $HOME/HDXFlash.ini <<EOM
[Tracing]
# enable/disable file tracing
File=1
# hex value
Flags=0x0FFFFFFF
# dec value
Level=9
EOM

Problems Observed with Different Releases

Receiver 12.0

CURL Library Issues

As the Flash redirection was not tested on ubuntu 11.10 (which overhauled the whole directory segregation), Citrix Technical Support Engineers used to look for libcurl in /usr/lib/libcurl.so or /usr/lib/libcurl.so.<VERSION> and that was failing even if libcurl is installed on the machine. This issue is fixed in 12.1. The engineers are not looking for a particular directory location; rather they are looking for system's ld.so.cache.

Workaround

Create a link of libcurl.so in /usr/lib/libcurl.so

Example: It might be present at /usr/lib/i386-linux-gnu/

Flash Plug-in Issue

Flash plug-in location must be specified in the list of locations in the release document.

Workaround

In case Flash plug-in is not at the proper locations, you can always create a link to any of the specified locations in the user document.

Admin Policy

Changes inside the module.ini are not getting reflected while using the receiver.

Reason

2. If you are trying to override any value in module.ini, then you must update your All_Regions.ini as well to provide the keys to be overridden with their default values. Refer to Linux Receiver Administrators Guide for help.

Keyboard and Mouse Issue with 12.0

Q: I am unable to write into the text box, which is part of Flash window.

A: This is a known issue with 12.0. The keyboard and mouse handling was not possible inside the Flash region and working with Flash redirection and keyboard mouse was not getting disassociated from plugin. It has been fixed with the 12.1 release.

Seamless Internet Explorer

Q: Seamless window is not visible when you open multiple windows of seamless Internet Explorer.

A: Flash redirection was not taking care of seamless case in 12.0 release and has been included in the 12.1 release.

Multi-monitor Setup

Q: If you are running Flash redirection on Linux in multi-monitor setup, Flash window appears on Primary monitor and browser window is on Secondary monitor.

A: This feature was not present in the 12.0 release. In multi-monitor setup, the redirected Flash window will not be in its desired location. This feature has now been implemented in the 12.1 release.

How to Disable Flash Redirection

There are multiple ways you can disable Flash redirection, such as:

1. In module.ini section ICA 3.0, you can set FlashV2=Off, to disable the Flash VC.
   After setting FlashV2=Off, the VD for Flash redirection will not even be loaded.

2. In module.ini HDXFlashUseFlashRemoting=Never. This will disable the Flash redirection altogether.

ARM Platforms

Q: Why does Flash redirection not work with Linux receiver 12.0?

A: Linux receiver 12.0 did not support Flash redirection on ARM Linux devices; however, ARM Linux support was added in the 12.1 release.

Flash Redirection and Caching

Q: What are the locations of cache file which are being created by the HDX Flash module?

A: The location is $ICAHOME/.ICAClient/CtxFlashCache.

Q: How to verify if there is a problem in caching?

A: Generate the log files and see if the function with the name containing “Cache” is logging any failure message.

There could be several issues, such as:

To verify if the problem is actually with these semaphores and not their locks being reset, you can try cleaning them:
ipcrm –s <ID>

You will see a signal handler for SIGABORT in the log being generated.

Thin Client Related Issues

Q: I am dealing with a thin client which does not allow me to copy on its disc though I am a root user.

A: Most of the thin client vendors are coming up with this kind of file system segregation, which does not allow even super user to write anywhere or everywhere. There are many options to make it writable:

ubuntu> mount -o remount rw /

Or

(HP Thin clients) This vendor provides specific command to make it writable:

ubuntu> fsunlock

Adobe Flash Library Version Related Issue Found on Linux

While playing Flash videos with Flash Player version 11.2 (currently tested with 11.2.202.262) and Ubuntu 11.10/ 12.04, some Flash instances crashes and reverts to server side rendering. Further Investigations confirmed that a bug exists in given version of Flash Player. In order to work around this bug, users are encouraged to use an upgraded/different version of Flash Plugin. As of today, version 11.1.102.63 is known to work well in the preceding circumstances.

Windows Side Events

Events logged by Flash RAVE

On newer operating systems (Vista and above), a custom event log is created and used by HDX Flash RAVE. This event log appears in the Applications and Services logs\Citrix\Multimedia\Flash event folder.

ID Type Symbols Text (English)
42 = Error EVENT_FLASH_SERVER_PANIC_OR_CRASH Unexpected server error occurred in HDX MediaStream for Flash. The browser will be closed.%r%rFile Name: %1%rLine Number: %2%rFunction: %3%rFunction Dname: %4 <nowiki>< nowiki>43 Error EVENT_FLASH_HOOK_NOT_INIT There was a problem initializing HDX MediaStream for Flash. Server-side Flash rendering will be used if available.

45 = Error EVENT_FLASH_SERVICEDOWN. The HDX MediaStream for Flash Service is not available. Server-side Flash rendering will be used if available.

46 = Error EVENT_FLASH_CLIENT_PANIC_OR_CRASH Unexpected client error occurred in HDX MediaStream for Flash. The browser page will be refreshed and server-side Flash rendering will be used if available.

47 = Warning EVENT_FLASH_DLLGETCLASSOBJECT_ERROR HDX MediaStream for Flash failed to start up. Server-side Flash rendering will be used if available.

48 = Warning EVENT_FLASH_PLAYER_VERSION_MISMATCH The %1 Flash Player on the client device is a lower version than the Flash Player on the server device. Server-side Flash rendering will be used.%r%rClient %1 Player version: %2%rServer %3 Player version: %4

49 = Warning EVENT_FLASH_PLAYER_MAX_SUBCHANNELS_EXCEEDED The maximum number of Flash Player instances has been exceeded for this session. If available, Server-side Flash rendering will be used for the additional Flash Player instance.

50 = Warning EVENT_FLASH_CLIENT_NOSUPPORT The client does not support HDX MediaStream for Flash. Server-side Flash rendering will be used if available.

51 = Warning EVENT_FLASH_CLIENT_PLAYER_NONE The Flash Player is not available on the client device. Server-side Flash rendering will be used if available.%r%rRequired Client Flash Player type: %1

52 = Warning EVENT_FLASH_CLIENT_PLAYER_VERSIONLOW The %1 Flash Player on the client is a version not supported by HDX MediaStream for Flash. Server-side Flash rendering will be used if available.%r%r%2 Client Player version: %3

53 = Warning EVENT_FLASH_LATENCY Network latency is above the level supported by HDX MediaStream for Flash. Server-side Flash rendering will be used if available.%r%rMeasured latency (milliseconds): %1

54 = Warning EVENT_FLASH_CLIENT_CONTENT_FETCHING_FAILED The client's Flash Player was unable to fetch Flash content directly from the client device. The browser page will be refreshed and server-side Flash rendering will be used if available.

55 = Information EVENT_FLASH_DISABLED HDX MediaStream for Flash is not enabled. Server-side Flash rendering will be used if available.

56 = Information EVENT_FLASH_URL_BLACKLISTED A Flash Player instance matched the HDX MediaStream for Flash dynamic blacklist. Server-side Flash rendering will be used if available.%r%rURL: %1

57 = Information EVENT_FLASH_CLIENT_OPTOUT The client end-user has chosen not to use HDX MediaStream for Flash. Server-side Flash rendering will be used if available.

58 = Warning EVENT_FLASH_URL_BLACKLISTED_BLOCKED A Flash Player instance matched the HDX MediaStream for Flash dynamic blacklist. The Flash rendering will be blocked due to configuration.%r%rURL: %1

59 = Warning EVENT_FLASH_URL_COMPATLISTED A Flash Player instance matched the HDX MediaStream for Flash compatibilty list. Server-side Flash rendering will be used if available.%r%rURL: %1

60 = Information EVENT_FLASH_URL_COMPATLISTED_BLOCKED A Flash Player instance matched the HDX MediaStream for Flash compatibility list. The Flash rendering will be blocked due to configuration.%r%rURL: %1

61 = Information EVENT_FLASH_INTELLIGENT_FALLBACK A Flash Player instance meets Intelligent Fallback rules. Server-side Flash rendering will be used if available.%r%rURL: %1

62 = Information EVENT_FLASH_INTELLIGENT_FALLBACK_BLOCKED A Flash Player instance meets Intelligent Fallback rules. The Flash rendering will be blocked due to configuration.%r%rURL: %1

63 = Information EVENT_FLASH_FLASH_BLOCKED The server's Flash player has been completely blocked due to configuration.

64 = Warning EVENT_FLASH_CLIENT_V1_USE_V1. The client supports an older version of HDX MediaStream for Flash. HDX MediaStream for Flash will be used at a reduced level of functionality.

65 = Warning EVENT_FLASH_CLIENT_V1_USE_SERVER_SIDE_RENDERING The client supports an older version of HDX MediaStream for Flash. Server-side Flash rendering will be used if available.

66 = Information EVENT_FLASH_SSCF_FALLBACK A Flash Player instance has fallen back to server-side content fetching.%r%rURL: %1

67 = Warning EVENT_FLASH_MINIMUM_BROWSER_VERSION The browser major version is below the minimum major version supported by HDX MediaStream for Flash. Server-side Flash rendering will be used if available.%r%rReported browser major version: %1

68 = Warning EVENT_FLASH_MAXIMUM_BROWSER_VERSION The browser major version is above the maximum major version supported by HDX MediaStream for Flash. Server-side Flash rendering will be used if available.%r%rReported browser major version: %1

69 = Warning EVENT_FLASH_MINIMUM_COLOR_DEPTH The session color depth is below the minimum color depth supported by HDX MediaStream for Flash. Server-side Flash rendering will be used if available.%r%rReported color depth (bpp): %1

70 = Warning EVENT_FLASH_ROAMING_CLIENT_SERVER_MISMATCH The browser was initially started with a version of HDX MediaStream for Flash that does not match the current client (Smooth Roaming is in effect). Server-side Flash rendering will be used if available.

71 = Warning EVENT_FLASH_URL_UNAVAILABLE The site URL cannot be obtained from the browser to check against the dynamic blacklist or the compatibility list. Server-side Flash rendering will be used if available.