Error code

Steam E20

STEAME20
Game/Platform Error· An error code shown by a game or gaming platform/launcher.

What it means

Steam cannot connect to the network — displayed as "Error Code E20" in the Steam client..

How to fix it

  1. Check your internet connection.
  2. Restart Steam and your computer.
  3. Allow Steam through Windows Firewall.
  4. Clear the Steam cache (run steam://flushconfig).
  5. Flush DNS (ipconfig /flushdns).
  6. Check Steam server status at steamstat.us.
  7. Change download region.
  8. Reinstall Steam.

Not affiliated with Steam. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.