advanced-egress-firewall-filtering-for-vercel-sandbox (opens in new tab)

# Advanced egress firewall filtering for Vercel Sandbox **Published:** February 11, 2026 | **Authors:** Valerian Roche, Rob Herley --- Vercel Sandbox can now enforce egress network policies through Server Name Indication (SNI) filtering and CIDR blocks, giving you control over which hosts a sandbox can reach. Outbound TLS connections are matched against your policy at the handshake, unauthorized destinations are rejected before any data is transmitted. By default, sandboxes have unrestric...

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