Source Intelligence

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

All of v2.1.229 Home All releases olderv2.1.228 v2.1.231newer
Claude Code v2.1.229

Sandbox proxy explains itself to unauthenticated clients

You'll notice
Useful3 Signal2
Sandbox

The sandbox proxy now tells refused connections why, including SSH ones, instead of dropping them.

What

When the sandbox proxy requires an auth token, a client that offers no authentication method now gets an explanation rather than a silently dropped connection. On port 22 the proxy writes an SSH-shaped banner and disconnect message saying why the connection was refused, including the policy reason when the destination is on the deny list.

Evidence

This proxy requires authentication, and this client did not offer an authentication method, so the connection was refused.

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.229 →