Daily review fixes: MCP Host refusals explained, security events kept, setup links measurable - #845
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…, setup links measurable
- A remote MCP server whose DNS-rebinding protection refuses our Host
("host not allowed" / "Invalid Host header") now gets an error that
says to add the hostname to its allowed hosts. Seen on a customer's
MCP connector behind a trycloudflare tunnel, stuck at 0 tools.
- A security event that references a deleted user or organization
(TOKEN_REJECTED for a deleted user) was lost on the foreign key; it is
now stored without the links, with the ids in its metadata.
- Expired one-time setup links stay in the table for a week instead of
being deleted at the next link, so the share of links that get opened
can be measured. They stop working at expiry as before.
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From the daily production review (4 Oct 2026).
host not allowed/Invalid Host header. That is the remote server's DNS-rebinding protection refusing the tunnel hostname. The error now says which setting to change (allowedHosts). Applied where the MCP client connects, so every discovery path gets it.Failed to persist security event 'TOKEN_REJECTED': Foreign key constraint violated(2× in 24h): the referenced user/org no longer exists. The event is now stored without the links, with the ids undermetadata.unresolved.resolveLink).Tests: backend 6648 passed (+4 new).