Connection Interrupted, issue reported with different version of Citrix Virtual Apps and Desktops
Article ID: CTX319676
Updated On:
Description
You may see user sessions are getting disconnected at launch, incomplete ghost session with name "-" is seen on the VDA and Connection Interrupted error for user. if vda have Microsoft defender Anti virus.
Environment
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Resolution
- Microsoft has fixed the issue in the Microsoft Defender Antivirus (MDAV) Platform Update version 4.18.2201.10 (or newer).
What was optimized? Microsoft added the AllowSwitchToAsyncInspection setting to Set-MpPreference. This policy enables a performance optimization, that allows synchronously inspected network flows, to switch to async inspection once they've been checked and validated.
Workaround:
1. Revert to Windows Defender update version 4.18.2105.4
OR
2. Disable Network protection and Network intrusion prevention on VDA:
Configure policy setting
"Computer Configuration\Administrative Templates\Windows Components\Windows Defender Antivirus\Windows Defender Exploit Guard\Network Protection\Prevent users and apps from accessing dangerous websites" to "Audit Mode"
Problem Cause
The issue was caused by Network protection and Network intrusion prevention in Windows Defender.It gets enabled after Windows Defender update version 4.18.2105.5.
Additional Information
Ensure AV exclusions are added as per following blog/tech-zone:
Citrix Recommended Antivirus Exclusions
https://www.citrix.com/blogs/2016/12/02/citrix-recommended-antivirus-exclusions/
Tech Paper: Endpoint Security, Antivirus, and Antimalware Best Practices
https://docs.citrix.com/en-us/tech-zone/build/tech-papers/antivirus-best-practices.html
Provisioning Services Antivirus Best Practices
https://support.citrix.com/article/CTX124185
Citrix Recommended Antivirus Exclusions
https://www.citrix.com/blogs/2016/12/02/citrix-recommended-antivirus-exclusions/
Tech Paper: Endpoint Security, Antivirus, and Antimalware Best Practices
https://docs.citrix.com/en-us/tech-zone/build/tech-papers/antivirus-best-practices.html
Provisioning Services Antivirus Best Practices
https://support.citrix.com/article/CTX124185
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