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# citrix-vads
Slackbot
06/04/2020, 2:16 PMThis message was deleted.
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Salim Hurjuk
06/04/2020, 3:21 PMUse VDA 1912 CU1
Salim Hurjuk
06/04/2020, 3:25 PMCWA version?
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Marco Hofmann
06/05/2020, 9:41 AM1906, 1909, 1912, 2002 & HTML5 Receiver. All affected.
Marco Hofmann
06/05/2020, 9:41 AMYes, I can create a new Master Image with CVAD 1912.1, but this would take a moment..
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Salim Hurjuk
06/05/2020, 9:45 AMOkay
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Marco Hofmann
08/06/2020, 10:13 AMWas completely solve by turning of HDX Adaptive transport (EDT aka UDP) and back to TCP.
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Salim Hurjuk
08/13/2020, 6:35 PMOkay..but I am doing the POC this same version, I didn't face the issue....
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Christian Jöns
09/02/2020, 9:06 AMHey @Marco Hofmann,
do you have any News on that issue?
Have also troubles with 1912 CU1 and Grey Screen on LogOn with Server 2016 and 2019. Only a reboot will fix it.
@Deyda you also disable EDT?
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Marco Hofmann
09/02/2020, 9:19 PMI solved it by disabling EDT about 4 weeks ago. Error is gone.
Completely forgot about this thread here.
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Deyda
09/03/2020, 5:25 AMYes i disable edt and it works then 😇😅
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Christian Jöns
09/03/2020, 7:59 PMThanks 🙏🏻
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Marco Hofmann
09/07/2020, 1:22 AMThe error returned 5 days ago. Same customer, after the error was gone for 5 Weeks!
I haven't analyzed it, yet.
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Christian Jöns
09/07/2020, 5:46 PM@Marco Hofmann oh no. 😞
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Marco Hofmann
09/08/2020, 1:38 PMSo I double checked today. It's 100% TCP and exactly the same error. Have no idea what's going on here.
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Christian Jöns
09/08/2020, 5:01 PMHey @Marco Hofmann , we‘ve now created a new citrix case. We saw errors in CDF Traces.
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Marco Hofmann
09/08/2020, 5:22 PMWhich exact VDA version are you using on which os?
I use VDA 1912 on 2016.
currently building a test for 2006 on 2016
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Christian Jöns
09/08/2020, 5:27 PMServer 2016 w 1912 cu 1
Server 2019 w 1912 cu 1
Server 2019 w 1912
Issue Happens on all setups.
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Marco Hofmann
09/08/2020, 5:41 PMSo if we really have the same issue, that means I could skip CU1 tests and do 2006 tests instead.
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Christian Jöns
09/08/2020, 5:48 PMI think its the same. I will let you know any Updates on the CTX Case. Webex on Thursday
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Marco Hofmann
09/08/2020, 5:51 PMI also talked to the customer, that after the 2006 tests, we should open a case.
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Christian Jöns
09/08/2020, 6:47 PMIf it will be possible take the affected VDA in maintenance when the issue occurs. The you could collect the cdf traces and simulate logons on the affected VDA
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Oliver Dittus
10/01/2020, 2:45 PMI got the same issue on a customer site too. It seams that something is causing the CtxUvi to crash. We could narrow down that the “winlogon.exe” from the particular user with the “grey screen” issue has none Citrix dll’s loaded. CTX220418 guided me to on the right track i guess… Now we’re investigating what possibly could cause the driver to crash.
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Marco Hofmann
10/01/2020, 2:47 PMAccording to @Christian Jöns Sophos chrashed their CtxUvi. Do you also use Sophos?
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Marco Hofmann
10/01/2020, 2:47 PMMy customer also uses Sophos.
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Oliver Dittus
10/01/2020, 3:11 PMTrendMicro DeepSecurity - I will have a closer look at this…