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I found this https://docs.citrix.com/en-us/citrix-virtual-apps-desktops/1912-ltsr/whats-new/removed-features.html VDA 5.6 is announced as depreciated since 7.16. Perhaps is the reason why your VDA cannot register anymore

Too fast @Julien Destombes I was about to post it 🙂

I think you mean this entry "XenDesktop 5.6 used on Windows XP. VDA installations on Windows XP are not supported" - am I right? But if it's deprecated - and already removed in 7.16 - why is it still available to choose during creation of a machine catalog?

Perhaps lack of communication between developers teams ?

Unfortunately I had not much time for extensive troubleshooting and had to do a rollback to 7.15 again. So now I'm looking for a statement if it still could/should work or if it definitely will not work (because they removed the functionality but didn't update the gui) - then I can talk with my customer and define a new plan.

It was deprecated in 7.12 and removed in 7.16. It sort of makes sense that you will be able to select 5.6 in 7.15 as that version obviously was release before 7.16. If you look at AppDisk, that feature is deprecated back in 7.13 but up until 2003, you could actually still configure and use the feature. So my estimate is still that you can go no further than 7.15 if you have XD5.6 and XP in the setup.

I checked on another installation - I'm still able to choose functional level 5.6 on 1912 LTSR.. 🤔

Interesting, I see that same in 2003 as well. So we have Citrix docs telling us that 5.6 is removed in 7.16 but we are still able to select it in 1912 and 2003??? Classic Citrix documentation 😄

As Kasper said, App Disk is depreciated for a long time and we still see it in Studio, even in Cloud !

I'll try to get a statement from Citrix

Hi, anything new here? Also have to move a customer using several xp machines for crap apps to 1912 😬