diff --git a/tests/e2e/p/permissionless_subnets.go b/tests/e2e/p/elastic_subnets.go
similarity index 91%
rename from tests/e2e/p/permissionless_subnets.go
rename to tests/e2e/p/elastic_subnets.go
index 21934ff6c619..b49c3dff1492 100644
--- a/tests/e2e/p/permissionless_subnets.go
+++ b/tests/e2e/p/elastic_subnets.go
@@ -9,6 +9,7 @@ import (
 
 	"github.com/stretchr/testify/require"
 
+	"github.com/ava-labs/avalanchego/api/info"
 	"github.com/ava-labs/avalanchego/ids"
 	"github.com/ava-labs/avalanchego/tests/fixture/e2e"
 	"github.com/ava-labs/avalanchego/utils/constants"
@@ -24,7 +25,7 @@ import (
 	ginkgo "github.com/onsi/ginkgo/v2"
 )
 
-var _ = e2e.DescribePChain("[Permissionless Subnets]", func() {
+var _ = e2e.DescribePChain("[Elastic Subnets]", func() {
 	tc := e2e.NewTestContext()
 	require := require.New(tc)
 
@@ -34,6 +35,17 @@ var _ = e2e.DescribePChain("[Permissionless Subnets]", func() {
 
 			nodeURI := env.GetRandomNodeURI()
 
+			infoClient := info.NewClient(nodeURI.URI)
+
+			tc.By("get upgrade config")
+			upgrades, err := infoClient.Upgrades(tc.DefaultContext())
+			require.NoError(err)
+
+			now := time.Now()
+			if upgrades.IsEtnaActivated(now) {
+				ginkgo.Skip("Etna is activated. Elastic Subnets are disabled post-Etna, skipping test.")
+			}
+
 			keychain := env.NewKeychain(1)
 			baseWallet := e2e.NewWallet(tc, keychain, nodeURI)
 
diff --git a/vms/platformvm/txs/executor/standard_tx_executor.go b/vms/platformvm/txs/executor/standard_tx_executor.go
index 58eeb71e1fea..1204b7d82502 100644
--- a/vms/platformvm/txs/executor/standard_tx_executor.go
+++ b/vms/platformvm/txs/executor/standard_tx_executor.go
@@ -28,6 +28,7 @@ var (
 	errEmptyNodeID                = errors.New("validator nodeID cannot be empty")
 	errMaxStakeDurationTooLarge   = errors.New("max stake duration must be less than or equal to the global max stake duration")
 	errMissingStartTimePreDurango = errors.New("staker transactions must have a StartTime pre-Durango")
+	errTransformSubnetTxPostEtna  = errors.New("TransformSubnetTx is not permitted post-Etna")
 )
 
 type StandardTxExecutor struct {
@@ -433,14 +434,16 @@ func (e *StandardTxExecutor) RemoveSubnetValidatorTx(tx *txs.RemoveSubnetValidat
 }
 
 func (e *StandardTxExecutor) TransformSubnetTx(tx *txs.TransformSubnetTx) error {
+	currentTimestamp := e.State.GetTimestamp()
+	if e.Config.UpgradeConfig.IsEtnaActivated(currentTimestamp) {
+		return errTransformSubnetTxPostEtna
+	}
+
 	if err := e.Tx.SyntacticVerify(e.Ctx); err != nil {
 		return err
 	}
 
-	var (
-		currentTimestamp = e.State.GetTimestamp()
-		isDurangoActive  = e.Config.UpgradeConfig.IsDurangoActivated(currentTimestamp)
-	)
+	isDurangoActive := e.Config.UpgradeConfig.IsDurangoActivated(currentTimestamp)
 	if err := avax.VerifyMemoFieldLength(tx.Memo, isDurangoActive); err != nil {
 		return err
 	}
diff --git a/vms/platformvm/txs/executor/standard_tx_executor_test.go b/vms/platformvm/txs/executor/standard_tx_executor_test.go
index f6bd40f7aae3..d57955c08b39 100644
--- a/vms/platformvm/txs/executor/standard_tx_executor_test.go
+++ b/vms/platformvm/txs/executor/standard_tx_executor_test.go
@@ -1597,6 +1597,29 @@ func TestDurangoMemoField(t *testing.T) {
 	}
 }
 
+// Verifies that [TransformSubnetTx] is disabled post-Etna
+func TestEtnaDisabledTransactions(t *testing.T) {
+	require := require.New(t)
+
+	env := newEnvironment(t, etna)
+	env.ctx.Lock.Lock()
+	defer env.ctx.Lock.Unlock()
+
+	onAcceptState, err := state.NewDiff(env.state.GetLastAccepted(), env)
+	require.NoError(err)
+
+	tx := &txs.Tx{
+		Unsigned: &txs.TransformSubnetTx{},
+	}
+
+	err = tx.Unsigned.Visit(&StandardTxExecutor{
+		Backend: &env.backend,
+		State:   onAcceptState,
+		Tx:      tx,
+	})
+	require.ErrorIs(err, errTransformSubnetTxPostEtna)
+}
+
 // Returns a RemoveSubnetValidatorTx that passes syntactic verification.
 // Memo field is empty as required post Durango activation
 func newRemoveSubnetValidatorTx(t *testing.T) (*txs.RemoveSubnetValidatorTx, *txs.Tx) {