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Random disconnects on server 2019 (VDA 2308/2311)


We have identified random disconnects for active sessions on a Windows Server 2019 with Citrix Apps deployed.
The issue seems to come up on all sorts of Citrix clients (tested on 22.3, 23.9.1 and 23.11) and VDA versions 2308 and 2311.
Our Citrix Platform (DC and SF) are deployed on Windows Server 2022, with Citrix Virtual Apps and Desktops 7 2203 LTSR CU4 (updated last week, with CU2 same errors).
We also have Citrix NetScaler ADC (13.1-51.15), but the problem also is internal, without connection throught ADC.


We have seen this events on the VDA servers:
- The Citrix TDICA Transport Driver connection from 172.22.x.x:53714 using protocol EDT has been suspended (session reliability triggered).
- Session reliability suspended the connection for user CNVII\USERNAME, session 32.
- Timeout waiting for response message from client 0000000001002A0000000000F10300C0000000000201000000000000000000000000000000000000
- The Citrix TDICA Transport Driver connection from has been closed.
- The Citrix TDICA Transport Driver connection from to port 2598 using protocol TCP received an invalid packet during its SSL handshake phase.


We are seeing sporadic issues where a user's session closed when they:
- Acces to local drive (C:) throught Windows Explorer app.
- Open a windows of propietary software that access to disk.
- Open some emails on Outlook (2016).


In this moment, the user sesion in Windows server still "active", but changes to "disconected" after a minute. In the users side, at Citrix Workspace no appears active sessions, but if the user attemps another sign in or open new app, he connects on the same multi-session VDA server, and there are two behaviors:
- The "second session" cannot access to previous apps (but they still running on the server).
- At time of the connection, the session is disconected again.


The only solution we have is to logoff the user session, from Director or loging onto the VDA.

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