diff --git a/sdk/buildstep/ask_test.go b/sdk/buildstep/ask_test.go
index 9df19195..876908d9 100644
--- a/sdk/buildstep/ask_test.go
+++ b/sdk/buildstep/ask_test.go
@@ -317,20 +317,22 @@ func TestPauseCapacityAndComposerKey(t *testing.T) {
 	// Issue 1748 (ADR 0664): a transport fault is told from a wrong source by its words; a step given again is no end; the
 	// bus waits 1 minute after the first run and 4 after the second.
 	for words, want := range map[string]bool{
-		`Get "https://proxy": dial tcp: lookup proxy.golang.org: i/o timeout`:                                              true,
-		`Head http://store.internal:5100/v2/x: dial tcp 10.10.0.1:5100: i/o timeout`:                                       true,
-		"kex_exchange_identification: read: Connection reset by peer":                                                      true,
-		"Connection closed by 10.10.0.1 port 222":                                                                          true,
-		"npm error code EAI_AGAIN":                                                                                         true,
-		"npm error code ETIMEDOUT":                                                                                         true,
-		"npm error code ECONNRESET":                                                                                        true,
-		"fatal: unable to access the forge: Could not resolve host: mesh-forge":                                            true,
-		"Get \"https://example.com/x.tar.gz\": context deadline exceeded (Client.Timeout exceeded while awaiting headers)": true,
-		(&HolderSilent{Seat: "go-package-registry", Holder: "gopkgs", Node: "ace"}).Error():                                true,
-		"nats: no responders available for request":                                                                        false,
-		"fatal: unknown revision or path not in the working tree":                                                          false,
-		"verifying module: checksum mismatch":                                                                              false,
-		"./main.go:3:1: syntax error: unexpected }":                                                                        false,
+		`Get "https://proxy": dial tcp: lookup proxy.golang.org: i/o timeout`:                                                  true,
+		`Head http://store.internal:5100/v2/x: dial tcp 10.10.0.1:5100: i/o timeout`:                                           true,
+		"kex_exchange_identification: read: Connection reset by peer":                                                          true,
+		"Connection closed by 10.10.0.1 port 222":                                                                              true,
+		"npm error code EAI_AGAIN":                                                                                             true,
+		"npm error code ETIMEDOUT":                                                                                             true,
+		"npm error code ECONNRESET":                                                                                            true,
+		"fatal: unable to access the forge: Could not resolve host: mesh-forge":                                                true,
+		"Get \"https://example.com/x.tar.gz\": context deadline exceeded (Client.Timeout exceeded while awaiting headers)":     true,
+		(&HolderSilent{Seat: "go-package-registry", Holder: "gopkgs", Node: "ace"}).Error():                                    true,
+		`invalid version: Get "https://proxy.golang.org/x/@v/y.info": dial tcp [2a00::1]:443: connect: network is unreachable`: true,
+		"dial tcp 10.10.0.1:22: connect: No route to host":                                                                     true,
+		"nats: no responders available for request":                                                                            false,
+		"fatal: unknown revision or path not in the working tree":                                                              false,
+		"verifying module: checksum mismatch":                                                                                  false,
+		"./main.go:3:1: syntax error: unexpected }":                                                                            false,
 	} {
 		if PassingCause(words) != want {
 			t.Errorf("PassingCause(%q) = %v, want %v", words, !want, want)
diff --git a/sdk/buildstep/passing.go b/sdk/buildstep/passing.go
index de3b382e..6c87182e 100644
--- a/sdk/buildstep/passing.go
+++ b/sdk/buildstep/passing.go
@@ -40,7 +40,7 @@ func (h *HolderSilent) Unwrap() error { return &Passing{Err: errors.New(h.Error(
 // reset connection, ssh's key exchange cut by a forge's per-source penalty) and npm's error codes. "no responders" alone is not
 // one: it is the same for a seat nothing holds (HolderSilent is the case a holder is named).
 var passingWords = []string{"i/o timeout", "no such host", "temporary failure in name resolution", "connection refused",
-	"connection reset", "tls handshake timeout", "lookup ", "kex_exchange_identification", "connection closed by",
+	"connection reset", "tls handshake timeout", "network is unreachable", "no route to host", "lookup ", "kex_exchange_identification", "connection closed by",
 	"could not resolve host", "client.timeout", "operation timed out", "connection timed out", "eai_again", "etimedout", "econnreset", "econnrefused", "enotfound", strings.ToLower(HolderSilentWords)}
 
 // PassingCause says words (a tool's output or a step's reason) are those of a transport fault.