Cannot retrieve information from Viso Services: Error 20021
Last updated: Aug 24, 2026
The is error is caused by Windows firewall blocking the Viso Services. To disable Firewall on all Viso computers:
- Open Control Panel > System and Security
- Click Windows Defender Firewall
- Click Turn Windows Defender Firewall on or off on the left side of the window.
- Under Overview, click Windows Firewall Properties
- In each network zone, select Turn off Windows Defender Firewall (not recommended)
- Click Close