Error code

Steam -101

STEAM-101
Game/Platform Error· An error code shown by a game or gaming platform/launcher.

What it means

Steam cannot connect to its servers — commonly seen in the Steam store or at startup..

How to fix it

  1. Check Steam server status.
  2. Restart your router.
  3. Clear Steam web browser cache.
  4. Add Steam to antivirus/firewall exceptions.
  5. Flush DNS and reset Winsock.
  6. Reinstall Steam.

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