docs: note firewall accept-first behavior on internet access page#233
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Pull request overview
Adds a warning callout to the Internet access docs clarifying that, due to firewall routing, TCP connections from inside the sandbox can appear to succeed even when blocked by denyOut rules, and recommends checking for an application-level response to confirm traffic flow.
Changes:
- Inserts a
<Warning>block indocs/sandbox/internet-access.mdxexplaining the accept-first TCP behavior. - Advises verifying connectivity via application-level signals (HTTP status, TLS handshake, etc.).
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Adds a warning to the Internet access page explaining that, due to how outbound TCP traffic is routed to the egress firewall, a TCP connection from inside the sandbox can appear to succeed even when the destination is denied by
denyOutrules — no packets actually reach the destination.Recommends checking for an application-level response (HTTP status, TLS handshake, etc.) to verify that traffic is actually flowing.
Context: internal thread clarifying that the firewall must accept the connection first and use a syscall to retrieve the original destination IP before applying egress rules.