diff --git a/modules/mesh-build-image/cmd/mesh-build-image/build.go b/modules/mesh-build-image/cmd/mesh-build-image/build.go
index 307446b48..70fa9e083 100644
--- a/modules/mesh-build-image/cmd/mesh-build-image/build.go
+++ b/modules/mesh-build-image/cmd/mesh-build-image/build.go
@@ -173,7 +173,7 @@ func (m *Module) build(ctx context.Context, args map[string]any) (any, error) {
 	argv = append(argv, contextDir)
 	if r := m.Run(ctx, m.env(), "buildah", argv...); r.Status != 0 || r.Err != "" {
 		m.sayFailure("buildah bud of "+art.Name+" of "+manifest.Module, r)
-		return nil, fmt.Errorf("buildah bud of %s: %s", art.Name, cause(r))
+		return nil, buildstep.Transport(fmt.Errorf("buildah bud of %s: %s", art.Name, cause(r)))
 	}
 	defer m.remove(local)
 	digest, err := m.localDigest(ctx, local)
diff --git a/modules/mesh-build-image/cmd/mesh-build-image/build_test.go b/modules/mesh-build-image/cmd/mesh-build-image/build_test.go
index 8430c34a9..b886de329 100644
--- a/modules/mesh-build-image/cmd/mesh-build-image/build_test.go
+++ b/modules/mesh-build-image/cmd/mesh-build-image/build_test.go
@@ -178,6 +178,8 @@ func TestBuildFailsWithBuildahsError(t *testing.T) {
 			[]string{"Error: the end"}, []string{"early noise", long}},
 		"nothing on stderr": {forgekey.Ran{Status: 2, Stdout: steps}, []string{"exit status 2", "nothing on stderr", "dl-cdn"}, nil},
 		"never ran":         {forgekey.Ran{Err: "ENOENT"}, []string{"ENOENT", "wrote nothing"}, nil},
+		"a pull the network cut": {forgekey.Ran{Status: 125, Stdout: steps, Stderr: "Error: creating build container: initializing source docker://alpine: pinging container registry registry-1.docker.io: Get \"https://registry-1.docker.io/v2/\": dial tcp: lookup registry-1.docker.io on 10.10.0.3:53: i/o timeout\n"},
+			[]string{"i/o timeout"}, nil},
 	}
 	for name, c := range cases {
 		m, f, states := setup(t, same)
@@ -200,6 +202,10 @@ func TestBuildFailsWithBuildahsError(t *testing.T) {
 		if len(st.Reason) > CauseBytes+200 {
 			t.Errorf("%s: the reason is %d bytes, more than its bound", name, len(st.Reason))
 		}
+		// ADR 0664 §1: a pull the network cut ends passing, for the bus to give the ask again; no other failure does.
+		if st.Passing != strings.Contains(name, "the network cut") {
+			t.Errorf("%s: passing = %v", name, st.Passing)
+		}
 		if len(f.called("push")) != 0 {
 			t.Errorf("%s: a failed build pushed", name)
 		}
diff --git a/modules/mesh-build-image/cmd/mesh-build-image/copy.go b/modules/mesh-build-image/cmd/mesh-build-image/copy.go
index 28655df7e..bd84c8ceb 100644
--- a/modules/mesh-build-image/cmd/mesh-build-image/copy.go
+++ b/modules/mesh-build-image/cmd/mesh-build-image/copy.go
@@ -112,7 +112,9 @@ func (m *Module) copy(ctx context.Context, args map[string]any) (any, error) {
 	raw, err := m.call()("seat:"+buildstep.ImageSeat+"."+reg.VerbMirror, reg.MirrorInput{Name: module + "/" + name, Source: from, Digest: digest})
 	if err != nil {
 		said.Refused(err)
-		return nil, fmt.Errorf("%s%s: %s's mirror: %v", builds.NotStored, name, buildstep.ImageSeat, err)
+		// A seat verb's "no responders" with a holder named is a transport fault (ADR 0664 §1): the seat's tool runner is replaced.
+		err = buildstep.HolderSilentOr(m.call(), buildstep.ImageSeat, err)
+		return nil, fmt.Errorf("%s%s: %s's mirror: %w", builds.NotStored, name, buildstep.ImageSeat, err)
 	}
 	var answer reg.MirrorAnswer
 	_ = json.Unmarshal(raw, &answer)
diff --git a/modules/mesh-build-node/cmd/mesh-build-node/fetch.go b/modules/mesh-build-node/cmd/mesh-build-node/fetch.go
index 1f5ebc28c..8d96b6641 100644
--- a/modules/mesh-build-node/cmd/mesh-build-node/fetch.go
+++ b/modules/mesh-build-node/cmd/mesh-build-node/fetch.go
@@ -353,7 +353,7 @@ func (m *Module) installOwn(ctx context.Context, root, dir, rel string) (install
 		"--no-audit", "--no-fund", "--prefix", scratch, "--userconfig", npmrc)
 	os.Remove(npmrc)
 	if why := ranFailed(r); why != "" {
-		return false, "", fmt.Errorf("installing the packages of %s (%s): %s", rel, strings.Join(names, ", "), why)
+		return false, "", buildstep.Transport(fmt.Errorf("installing the packages of %s (%s): %s", rel, strings.Join(names, ", "), why))
 	}
 	nm := filepath.Join(scratch, "node_modules")
 	if err := removeSDKCopies(nm); err != nil {
diff --git a/modules/mesh-build-node/cmd/mesh-build-node/package.go b/modules/mesh-build-node/cmd/mesh-build-node/package.go
index ab61e2e1b..9da43efab 100644
--- a/modules/mesh-build-node/cmd/mesh-build-node/package.go
+++ b/modules/mesh-build-node/cmd/mesh-build-node/package.go
@@ -93,7 +93,7 @@ func (m *Module) installDev(ctx context.Context, root, dir, rel string) error {
 	env := append(m.baseEnv(), "npm_config_cache="+m.npmCache())
 	r := m.Run(ctx, env, "npm", "ci", "--ignore-scripts", "--no-bin-links", "--no-audit", "--no-fund", "--prefix", dir, "--userconfig", npmrc)
 	if why := ranFailed(r); why != "" {
-		return fmt.Errorf("installing the dependencies of the package in %s: %s", rel, why)
+		return buildstep.Transport(fmt.Errorf("installing the dependencies of the package in %s: %s", rel, why))
 	}
 	return writeShims(filepath.Join(dir, "node_modules"), shimDir(root, rel))
 }
diff --git a/modules/mesh-build-node/cmd/mesh-build-node/toolchain.go b/modules/mesh-build-node/cmd/mesh-build-node/toolchain.go
index 08091c421..db3f8e091 100644
--- a/modules/mesh-build-node/cmd/mesh-build-node/toolchain.go
+++ b/modules/mesh-build-node/cmd/mesh-build-node/toolchain.go
@@ -10,6 +10,7 @@ package main
 import (
 	"context"
 	"fmt"
+	"git.novox.be/novox/mesh-catalog/modules/mesh-build-go/buildstep"
 	"io/fs"
 	"os"
 	"path/filepath"
@@ -99,8 +100,8 @@ func (t Toolchain) Ensure(ctx context.Context, version string) error {
 		"npm", "ci", "--ignore-scripts", "--no-bin-links", "--no-audit", "--no-fund", "--prefix", dir, "--userconfig", npmrc)
 	os.Remove(npmrc)
 	if ran.Err != "" || ran.Status != 0 {
-		return fmt.Errorf("npm ci --ignore-scripts for the toolchain %s failed (status %d %s): %s",
-			version, ran.Status, ran.Err, tail(ran.Stderr))
+		return buildstep.Transport(fmt.Errorf("npm ci --ignore-scripts for the toolchain %s failed (status %d %s): %s",
+			version, ran.Status, ran.Err, tail(ran.Stderr)))
 	}
 	if err := os.WriteFile(filepath.Join(dir, installedMark), []byte(version+"\n"), 0o600); err != nil {
 		return err
diff --git a/modules/mesh-build-node/cmd/mesh-build-node/toolchain_test.go b/modules/mesh-build-node/cmd/mesh-build-node/toolchain_test.go
index 8b208b60d..0c1a02038 100644
--- a/modules/mesh-build-node/cmd/mesh-build-node/toolchain_test.go
+++ b/modules/mesh-build-node/cmd/mesh-build-node/toolchain_test.go
@@ -3,6 +3,7 @@ package main
 import (
 	"context"
 	"errors"
+	sdkstep "git.novox.be/novox/mesh-delivery/sdk/buildstep"
 	"os"
 	"path/filepath"
 	"strings"
@@ -86,6 +87,18 @@ func TestAMissingToolchainDirectoryIsInstalledOnceFromTheLock(t *testing.T) {
 	if err := tc.Ensure(context.Background(), version); err != nil || len(fake.calls) != 1 {
 		t.Errorf("a present directory ran npm again: %d calls, %v", len(fake.calls), err)
 	}
+	// ADR 0664 §1 (issue 1748): an install the network cut is a transport fault, the bus gives the ask again; a package the
+	// registry lacks is not.
+	for _, c := range []struct {
+		stderr  string
+		passing bool
+	}{{"npm error code ECONNRESET\nnpm error network aborted", true}, {"npm error code EAI_AGAIN", true}, {"npm error code E404\nnpm error 404 Not Found", false}} {
+		bad := &fakeNpm{ran: forgekey.Ran{Status: 1, Stderr: c.stderr}}
+		err := toolchainIn(t, bad).Ensure(context.Background(), Recipe{Steps: "2", Lock: "y"}.Version())
+		if err == nil || sdkstep.IsPassing(err) != c.passing {
+			t.Errorf("%q: %v, passing %v, want %v", c.stderr, err, err != nil && sdkstep.IsPassing(err), c.passing)
+		}
+	}
 }
 
 // 1488/AC4: the install is told the mesh's registry for @novox with the account's credential, and only through a