diff --git a/weed/pb/grpc_client_server.go b/weed/pb/grpc_client_server.go
index e26d6278b..b3aff37a9 100644
--- a/weed/pb/grpc_client_server.go
+++ b/weed/pb/grpc_client_server.go
@@ -8,6 +8,7 @@ import (
 	"net"
 	"net/http"
 	"os"
+	"runtime"
 	"strconv"
 	"strings"
 	"sync"
@@ -81,7 +82,15 @@ func init() {
 // GrpcDial to host:grpcPort (or to a loopback alias of host on the same
 // port) is routed through the Unix socket. Dials to any other host on the
 // same port still go over TCP.
+//
+// No-op on Windows: the /tmp/...sock paths callers pass are POSIX-only and
+// the listen/dial would fail at runtime, taking gRPC down with it (#9430).
+// Skipping registration leaves the maps empty, so ServeGrpcOnLocalSocket
+// and resolveLocalGrpcSocket short-circuit and same-host RPCs go over TCP.
 func RegisterLocalGrpcSocket(host string, grpcPort int, socketPath string) {
+	if runtime.GOOS == "windows" {
+		return
+	}
 	localGrpcSocketsLock.Lock()
 	defer localGrpcSocketsLock.Unlock()
 	localGrpcSockets[grpcPort] = socketPath
diff --git a/weed/pb/grpc_client_server_test.go b/weed/pb/grpc_client_server_test.go
index 210578d68..bdc3cc48b 100644
--- a/weed/pb/grpc_client_server_test.go
+++ b/weed/pb/grpc_client_server_test.go
@@ -2,6 +2,7 @@ package pb
 
 import (
 	"fmt"
+	"runtime"
 	"testing"
 
 	"google.golang.org/grpc/codes"
@@ -74,6 +75,9 @@ func TestIsClientSideMarshalError_RequiresGrpcStatus(t *testing.T) {
 // continue out over TCP — they must NOT be hijacked into host A's local
 // socket on the basis of port match alone.
 func TestResolveLocalGrpcSocket_RemotePortCollision(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("Unix-socket routing is disabled on Windows (#9430)")
+	}
 	// Snapshot and restore global state so the test does not leak into others.
 	localGrpcSocketsLock.Lock()
 	prevSockets := localGrpcSockets