Securing AI agent network egress: A default-deny approach

Short summary

A practical guide to securing AI agent network access through default-deny egress policies. Key recommendations include starting with no outbound network, allowlisting by domain through a proxy, controlling DNS to prevent exfiltration, scoping per task, and logging every outbound call. The post emphasizes that egress control complements sandbox isolation to prevent data exfiltration from compromised agents.

• •Start with zero outbound network and allowlist only specific domains via proxy
• •Control DNS separately — it is itself an exfiltration channel
• •Scope allowlists per task, not per system; log every outbound call for detection

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