citrix xenap scanner issues

we publish one app using citrix xenapp 7.17 for POC all on one physical server.its working fine  and printing fine.the only problem that we are unable to scan from the published apps.its giving the message that unable to find the appropriate scanner.
i installed the twain compatible driver for the scanner on the client PC .i test the drivers working fine by disabling the WIA service and test the scan.i double check the USB redirection policies enabled and compression set to medium.i use twaker on server and client machine to check the scanner but did not see my scanner to acquire.i also check by copying the  user.dll to user profile on citrix server but no luck
locally the scanner is working fine with application without citrix xenapp.

scanner is cannon
xenapp 7.17
windows server 2012
kastro AbbasiIT consultantAsked:
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Dirk KotteSECommented:
you do not need USB redirection. Citrix work with Twain redirection.
The following articles give an detailed explanation how to activate and troubleshoot twain redirection:

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kastro AbbasiIT consultantAuthor Commented:
i allready follw these steps in above url but no luck.
Dirk KotteSECommented:
do you try scanning from another app already?
My customer get a new (64bit) Version of his app and this don't work anymore.
The same with other 64 bit apps (irfanview, ...)
... while 32 bit versions keeps working.
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kastro AbbasiIT consultantAuthor Commented:
i checked by publishing the irfanview  and the scanner is working with it.
Dirk KotteSECommented:
with 64 bit too?
possible yout app don't use twain but connects to the scanner directly
kastro AbbasiIT consultantAuthor Commented:
app is using twain drivers perfectly without xenapp but once we try to aceess through xenapp then it fail immediately.
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Printers and Scanners

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