Error 21 usually means Valve-side maintenance or partial outage. Store, community, or login may fail while other features work.
Usually server-sideUpdated 2026-06-08
How to fix step by step
- 1Check Steam status on Oracnoos.
- 2Wait for maintenance to complete.
- 3Restart Steam client after status recovers.
- 4Check Steam community forums for incident posts.
How 21 differs from related codes
- Error 105: Steam could not reach its servers — often during maintenance, DNS issues, or firewall blocks. (server or client)