googleapis/mcp-toolbox · error

connection to blocked IP %s denied

Error message

connection to blocked IP %s denied

What it means

Error "connection to blocked IP %s denied" thrown in googleapis/mcp-toolbox.

Source

Thrown at internal/sources/http/http.go:338

	}

	resolver := guard.Resolver
	if resolver == nil {
		resolver = net.DefaultResolver
	}

	dialer := &net.Dialer{
		Timeout:   30 * time.Second,
		KeepAlive: 30 * time.Second,
		Control: func(network, address string, c syscall.RawConn) error {
			host, _, err := net.SplitHostPort(address)
			if err != nil {
				return err
			}
			ip := net.ParseIP(host)
			if ip != nil {
				if guard.IsIPBlocked(ip) {
					return fmt.Errorf("connection to blocked IP %s denied", ip)
				}
			}
			return nil
		},
	}

	if r, ok := resolver.(*net.Resolver); ok {
		dialer.Resolver = r
	}

	tr.DialContext = dialer.DialContext

	client := &http.Client{
		Timeout:   duration,
		Transport: tr,
		CheckRedirect: func(req *http.Request, via []*http.Request) error {
			if len(via) >= 10 {
				return fmt.Errorf("stopped after 10 redirects")

View on GitHub (pinned to 8cc6e09de2)

When it happens

Trigger: Thrown at internal/sources/http/http.go:338 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of googleapis/mcp-toolbox@8cc6e09de2 (2026-09-05). Data as JSON: /api/errors/6e76b457cd7c5be4. Report an issue: GitHub.