Azure Virtual Desktop sign-in screen is blank
Azure Virtual Desktop users might encounter sign-in issues that result in a black screen. There are multiple possible causes for black screens, but users can be impacted from issues synchronizing with AppReadiness, and multiple sessions signing in or out.
Note
These sign-in issues may also occur in the RDS environment, where user profiles are created every sign-in and deleted every sign-out.
Causes
The following list contains known scenarios causing black screens, and the non-security fixes which address them. This list does not cover every possible reason a black screen can occur. Verify that you have the latest updates, as blank screen updates are being released on a near-monthly basis.
Resolution
Note
Workarounds should not be considered long-term solutions. Back up your registry keys anytime that you test changes. If the black screen is tied with AppReadiness issues, set the following registry entries for the AppReadiness pre-shell task, and then change the first sign-in’s timeout window to 30 seconds to avoid the black screen for the first user’s sign-in.
| Registry Location | Data Type | Value | New timeout duration |
|---|---|---|---|
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\AppReadinessPreShellTimeoutMs |
Data Type: DWORD |
Value: 0x7530 |
30000 ms = 30s |
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\FirstLogonTimeout |
Data Type: DWORD |
Value: 0x1e |
30000 ms = 30s |
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DelayedDesktopSwitchTimeout |
Data Type: DWORD |
Value: 0x1e |
30000 ms = 30s |
More Information
If you continue to see black screens after you confirm that you have the latest updates, perform a full memory dump and include it in a support case.
Find the steps to enable and collect a dump file at Collect an OS memory dump