Update to VDA 1912 LTSR CU7 - screen freezes suddenly

[Maik Ludwig]

Hello,

 

we have recently updated our infrastructure from 1912 LTSR CU6 to CU7. This has also worked without any problems so far.

However, directly after logging in, the Citrix session freezes for some. Only the image freezes - mouse and keyboard inputs are still accepted.

 

This problem only occurs when using the Citrix Workspace app in Windows on our devices with VPN.
On the same device directly in our buildings there are no problems and from external (VPN) with this device via an additional Linux machine it also works.

Private computers at home via netscaler also works.

This means that the error occurs exclusively in Windows with the Citrix Workspace app + VPN.
We use the Workspace app 2203 LTSR, but all other versions have the error as well.

 

BUT, when we roll back our VDAs to 1912 LTSR CU6, the connection works again. The error only occurs with VDA version CU7.
So for now we have put all VDA back to the CU6.

 

Has anyone ever had such a problem or is anything known in this regard?
Is it bad if we have VDA CU6 but the infrastructure on CU7?

 

Thanks in advance.

[Dennis van der Velde]

I would advise you to open a case for this issue.

[Jeff Riechers]

You can run different CU versions between VDA and Infrastucture.

 

Have you tried using 2203 cu2 instead of 1912?

 

But I agree, open a case, get some traces ahead of time.

[Maik Ludwig]

Actually the plan was to update from 1912 CU6 to 2203 CU2.
But unfortunately our SQL cluster is still running on SQL Server 2012, which is no longer supported by Citrix.
So we did the update to 1912 CU7 until our SQL cluster was upgraded.

 

Then I will try to open case.

[Marco Hofmann]

We experience something similar in DaaS Standard for Azure, since we switched from VDA 2212 to 2203. I guess 1912 CU7 and 2303 are related?

For us, the screen only freezes via Wi-Fi or Home Office, but not from the customers' office.

Do you have any news regarding your problem?

[Maik Ludwig]

Unfortunately, we haven't had time to take care of it yet (since the stopgap solution of using VDA CU6 is currently working).
We have to make requests to Citrix via our Citrix IT license provider and they are currently busy converting our licenses to the new licensing model.

Once this is complete we are considering building a new Citrix farm with the latest version.

[Brian Forst1709162423]

We have also just ran into this.  Only caveat is that we are only experiencing this when connecting to one pair of our NetScaler's (which happen to be our prod) 

Netscaler MPX 12.1 
VDA CU2-CU6 connect with no problems.
VDA CU7 freezes after a minute or so, but only the video.

Netscaler VPX 13.1
VDA CU2-CU7 connect fine no freezing.

[Scott Wilson1709163696]

Has any one had a resolution to this issue please ? or a known cause ? other than the VDA's being on CU7

[Maik Ludwig]

Unfortunately not. We are still on CU6.

[wbedwel586]

We have an almost identical issue only on Server Desktops/XenApp Servers using our Thin Clients. It will randomly freeze just after logon when the desktop loads. I'm goin back to CU6 to see if it resolves, has anyone got anywhere with Citrix on this ? Although CU6 has Security Vulnerabilities so do not want to stay on that.

 

[Saket .]

did Citrix Support provided any context regarding this, any solution from Citrix support regarding this issue...

[Saket .]

We observed this issue when we updated our VDA version to 1912 CU7 only on Windows Server 2019 but not on Windows 10 VDIs. 

[Scott Wilson1709163696]

We observed this issue when we updated our VDA's versions to 1912 CU7 from CU6 on Windows Server 2016, after spending some time with citrix support we have a current work around by adding a Citrix policy to turn off HDX Adaptive Transport (i.e. forcing the connection to use TCP) and now no more freezing applications.?

[Maik Ludwig]

14 hours ago, Scott Wilson1709163696 said:

We observed this issue when we updated our VDA's versions to 1912 CU7 from CU6 on Windows Server 2016, after spending some time with citrix support we have a current work around by adding a Citrix policy to turn off HDX Adaptive Transport (i.e. forcing the connection to use TCP) and now no more freezing applications.?

Turning off HDX Adaptive Transport is not a nice solution...

Hopefully they fix it with CU8.

[Scott Wilson1709163696]

On 7/12/2023 at 5:07 AM, Maik Ludwig said:

Turning off HDX Adaptive Transport is not a nice solution...

Hopefully they fix it with CU8.

Has anyone had a chance to try CU8 to see if this has fixed the issue?

[Maik Ludwig]

Not yet, because we are moving to Citrix Cloud DaaS.

But in release notes there is the following fixed issue:

Quote

With the Enlightened Data Transport (EDT) protocol enabled, Citrix sessions might freeze when you update a VDA from version 1912 LTSR CU6 to version 1912 LTSR CU7. [CVADHELP-23370]

https://docs.citrix.com/en-us/citrix-virtual-apps-desktops/1912-ltsr/whats-new/cumulative-update-8/fixed-issues

 

So it looks like its fixed ?