diff --git a/cmd/api/api/instances.go b/cmd/api/api/instances.go
index 04698ddc3..945ad8314 100644
--- a/cmd/api/api/instances.go
+++ b/cmd/api/api/instances.go
@@ -656,6 +656,12 @@ func (s *ApiService) RestoreInstance(ctx context.Context, request oapi.RestoreIn
 	result, err := s.InstanceManager.RestoreInstance(ctx, inst.Id)
 	if err != nil {
 		switch {
+		case errors.Is(err, context.Canceled):
+			log.DebugContext(ctx, "restore request canceled")
+			return oapi.RestoreInstance499JSONResponse{
+				Code:    "client_closed_request",
+				Message: "request canceled",
+			}, nil
 		case errors.Is(err, instances.ErrNotFound):
 			return oapi.RestoreInstance404JSONResponse{
 				Code:    "not_found",
diff --git a/cmd/api/api/instances_test.go b/cmd/api/api/instances_test.go
index 06abe3e54..fce9ee10a 100644
--- a/cmd/api/api/instances_test.go
+++ b/cmd/api/api/instances_test.go
@@ -899,9 +899,7 @@ func TestCreateInstance_ErrorStatusMapping(t *testing.T) {
 }
 
 // errActionInstanceManager is a fake whose lifecycle actions always fail with a
-// preset error, used to assert action handlers map a deleted-image
-// images.ErrNotFound (resolved at action time, e.g. start/restore/fork of a
-// stopped instance whose image was removed) to a 404 instead of a blanket 500.
+// preset error.
 type errActionInstanceManager struct {
 	instances.Manager
 	err error
@@ -923,6 +921,51 @@ func (m *errActionInstanceManager) RestoreSnapshot(context.Context, string, stri
 	return nil, m.err
 }
 
+func TestRestoreInstance_ErrorMapping(t *testing.T) {
+	t.Parallel()
+
+	resolved := &instances.Instance{
+		StoredMetadata: instances.StoredMetadata{Id: "inst-restore-error"},
+	}
+	tests := []struct {
+		name         string
+		err          error
+		wantResponse oapi.RestoreInstanceResponseObject
+	}{
+		{
+			name: "client cancellation -> 499",
+			err:  fmt.Errorf("restore from snapshot: %w", context.Canceled),
+			wantResponse: oapi.RestoreInstance499JSONResponse{
+				Code:    "client_closed_request",
+				Message: "request canceled",
+			},
+		},
+		{
+			name: "internal failure -> 500",
+			err:  fmt.Errorf("restore from snapshot: hypervisor failed"),
+			wantResponse: oapi.RestoreInstance500JSONResponse{
+				Code:    "internal_error",
+				Message: "failed to restore instance",
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+			svc := newTestService(t)
+			svc.InstanceManager = &errActionInstanceManager{Manager: svc.InstanceManager, err: tt.err}
+
+			resp, err := svc.RestoreInstance(
+				mw.WithResolvedInstance(ctx(), resolved.Id, resolved),
+				oapi.RestoreInstanceRequestObject{Id: resolved.Id},
+			)
+			require.NoError(t, err)
+			require.Equal(t, tt.wantResponse, resp)
+		})
+	}
+}
+
 func TestInstanceActions_ImageNotFoundMapsTo404(t *testing.T) {
 	t.Parallel()
 
diff --git a/lib/oapi/oapi.go b/lib/oapi/oapi.go
index 2ee09469e..ef827c489 100644
--- a/lib/oapi/oapi.go
+++ b/lib/oapi/oapi.go
@@ -7162,6 +7162,7 @@ type RestoreInstanceResponse struct {
 	JSON200      *Instance
 	JSON404      *Error
 	JSON409      *Error
+	JSON499      *Error
 	JSON500      *Error
 }
 
@@ -10094,6 +10095,13 @@ func ParseRestoreInstanceResponse(rsp *http.Response) (*RestoreInstanceResponse,
 		}
 		response.JSON409 = &dest
 
+	case strings.Contains(rsp.Header.Get("Content-Type"), "json") && rsp.StatusCode == 499:
+		var dest Error
+		if err := json.Unmarshal(bodyBytes, &dest); err != nil {
+			return nil, err
+		}
+		response.JSON499 = &dest
+
 	case strings.Contains(rsp.Header.Get("Content-Type"), "json") && rsp.StatusCode == 500:
 		var dest Error
 		if err := json.Unmarshal(bodyBytes, &dest); err != nil {
@@ -15695,6 +15703,15 @@ func (response RestoreInstance409JSONResponse) VisitRestoreInstanceResponse(w ht
 	return json.NewEncoder(w).Encode(response)
 }
 
+type RestoreInstance499JSONResponse Error
+
+func (response RestoreInstance499JSONResponse) VisitRestoreInstanceResponse(w http.ResponseWriter) error {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(499)
+
+	return json.NewEncoder(w).Encode(response)
+}
+
 type RestoreInstance500JSONResponse Error
 
 func (response RestoreInstance500JSONResponse) VisitRestoreInstanceResponse(w http.ResponseWriter) error {
@@ -19164,54 +19181,54 @@ var swaggerSpec = []string{
 	"OgJtEhZ3muImaBIG9NseDELg1S3BBc0w7hhbcGkwr/i0qFBQIWWcZW3J1w4TqHiepitoGG14SGVSxTxX",
 	"f5EqJkLAx5a6m4gbbeDIVqfCl5pQLS6dO9ibQH7B6CADGR5cKs1UO90OYXnaOfjN/muepp1ux47Hgxq/",
 	"gXC/BqSx3uByFIveGQ+J8ZtYfhOMxSqz90AWazeHVaebJfI35oU/vbfQ2ewekAxBPqgZcb8mEdQbb9Xg",
-	"w3gBFvm4EKGsqakmtTWbatwse3p4ce5K6LQJyzi3n567L78C7XddtIYbM3LTvfewjeURPObsVrk0mwkX",
-	"dRihdfEcXz0hfbktWZpqGwr5Rps3t/O1IkwtqS+zCPtBbEqq4VzxFCsaQTmfaMa59Mi+wPw1hbes+bag",
-	"TDBuGD3ThsVfaFK9sIbgCyvIH1ijFcL+I9tHHz63wfThL9yj8oufPL284PhdJ3wD5D3UGxeUTFCGc0m0",
-	"XJWnBEWLSHNFU7+J4GiGIpypXBAoTUdQShlN89QHc9Y7NscAPHGxnV500ThXKMFiCnqReejCXSKepoTF",
-	"BCxkQzYjeE61UidQghVh0aInCZS0nRN0xcVlwnEMSn4WY/C1QEk8QTQFAjJ2ShSOscIgalzoEz8ymTkX",
-	"RZVbo1gzcl1SQzxkImffG5h+3eyFG+gFIoBDTeWsqIYY4ZiwKIjPfP51s7Evbw0+J6o+0QeKzbkVL33I",
-	"YB3f6umG83XE8TyyAGMu7Da2YfMrhF7ZrERWUxocGf17HmkzVzfHB3LxFEu86hR/Hb6dgui+Gv/Owztw",
-	"uEBxbrrzTiWQ+Z/VK1MwFD/cCdIlzTbe1jVTlH0rlvlGPG/rD/fnyS2saV8JJ+w2KvZNBYbKSX8NLNeu",
-	"6q147gOZEa0tybOKPSALdjFVDyY+ceFxucdi7rQM2xzNgm/73EkJDNoXZ9/Ydp1t25CD27JtZ5tdcqp7",
-	"jJyyHkRphjm4NeM2smprOvg3zQepzc5jmQ/OIkvfwb2xxZOCERrWmOFFwnH8ZwjTXeHBibgQBtMBUCIe",
-	"E6aoZzX0A/TBNldWLuu6fMn3p6ebTVxCqJU8QqhHzCG8pBj9WRoo5/96ToSgsYXeREenxzZglkokctZH",
-	"r1MKBf8vCcnKnBLI6+vr+Tl0i+Uq6RUYi26HMCUWGadMrR1F+erdDObTrWqr3zOftCDV3xzSrR3SYNl/",
-	"fOwMuAxkTZgJrNZMFVZri2dSNuEiNXIZHvNct655kF4mvZ+mCOWEJkQupCKpiQuc5AkcNyh4YIva2u/M",
-	"LnchKlafHJOwlhGRUikpZ3LIbLZGRoTuW3+u2/dCnIIOAYUL/npmmOTXET6nB2MixrBqWjXAIYJimZ2D",
-	"zhbOsq0YK9wQomWH9xlD+gni4ZBcpGOe0AgllF1KtJHQS6OeoLlEif5jc2VA3Qi++9Ile29/svRKn7AJ",
-	"DxZEMzRbEPOfKq/KsjXnmHx0bO0l8Q+L4z+w0WG2tr4osCA46UGRXYdGg3JFE/rRsDrdCJWKRibpBxdr",
-	"9/60YKr9ITslSuh3MCSXJYnBFADtcisTPNoa5oPBbpRRgDTbJTA4YHjNj1Po8ejsnUkEJSkXi+6Q6X9A",
-	"w28Pz4x3d4KtNcEbqK0GjE62Xq8JMT6HZfo3jtEzE1yJHxDc8G8uwZujfDSeIdlwRHm2SlXi2Z8+iNRK",
-	"cN/sCo/TrgAwS8VsNqYCRyAUy1muYn7FwjaEOU/yVP/D/HGyDqxL4Wj2Hl79aqRdM5y13bgJPopDaecU",
-	"E1Ow8UGcHmbBHmvMql44NwUQYirRgMFb4FD9Gan7y5vv/XX8Ct2ddkVdMdSv5mzd981nx+AwLvz1eCzH",
-	"3FCam4niq61PV5g2W59+THh0KS0Yim821HobgIbrH0uQZ+siBDEBcjORBREyUFVEdoesZoA0mDsSYaSI",
-	"SCnDyRbM2TQCcNXOioXnnEKKdJRQSFKjMaAWJYBJDQB0ejZgqHINeB5dactF+e/4zkjF0ZhEPCUOwnsz",
-	"pLr9DVP1ExdVPO6vhS++9dYfQPkwBXv7Ggjy5h4/C5L8FF9DqHScW4eyG9HGS17+aExBXQR7M+zsDuSw",
-	"00XDzk467OgdOMJgQsUK7aOUslwR2UfHxr4FSbBPBkiSiLNYOiRxZ8HbHcimlFhDlg35lU/gu/sUeyxV",
-	"wVK+sZ2E2IN+D+nvIWkHbfgHzp7JuAuHLkY8V8bcb8+VfSsmCswjm/fuq/XOyDfdvg0n/5s9vhUeBbus",
-	"2aW39YazZ7mckWaT2ytTnSdXY0CodhUz5Qz9nY9lFzFyZazhQqr+Et/TX5+ZDu4DPV93dRPkfDv3b7D5",
-	"LWDzy7UKwyWaAEt9JTvqMJiJ5DrjQgGOos12NzQEmgRgN/AIJ+j10cmQRZoVGXA/QVIO3MmCfJtb+PBv",
-	"5+jF0ZsuOobqjejnfLzZR69ZsnA1tI2PZsiMJGaYV4QZGhuqJXHoejZjB+q5y2Bx3cEDlUM2JyPgWXF7",
-	"5YLEu50ZwTFIJH90XnHTWQD3980rfYAAetd8WWx7Z6Xw0XlDlFj0DieKiOVmT22eFCtQK+wl7UDgrOBm",
-	"oCd1h9Jhn5V9GtnAgFPs7nQCWBWfvlUyuPuqn/fjJTNxIqaG3DgHrE8GSQY4XjyuWCY5QwVzDLFA/7ou",
-	"agE0ZQlbXrZSwYAumyK/vyKT+0reVUF3/3c9XTDTR+toyir7pIm4qCGy1tPrkoNnBpDYOqoinOGIqkUX",
-	"4SSxd5S9CYqIlF4h/o4FwZcxv2L9IXtTVC+xCb3o6Oxd1zlqUUzlpWnB+mL76PWcCJmPi8EhOGjGawxr",
-	"TuIhUxxFOInyRIsbZDIhEeTiQlES2eDLLYbSucOzU3YSrKDiRbXnj65wW5gmYPdKsqhT3JbZ6i1BogTT",
-	"tBn+2wpqEHAIoQZj3ShniLJJYkOqIsGlRLapHknolI4TGyAk++jtjCCJUzJkWYIZIwLl0kTF66H3MkGk",
-	"zE2Ct24AYHINRXVRCe2XCa5saELCuZAmmkBT+PtTJBXJVpDZG9PyKcz5jmRb07jt6YGM1LUxNJtC7CtI",
-	"b4ihFLPgmo7yxAUw3msouhnQQ0uJj+XgvxV0OiVCnwpsmKwJxzPH2i2nOfSVjOXGIo7nxVvtijgWrXpZ",
-	"iV7G3kpotlGJdh13bhb1F+j8kjai99lHN8si/kV/1LLvarZqeBD20WfO8s9SG//cSxJsa8AqKfyxmZO8",
-	"kVeOaiXRdj2sVuvM2rvMdG2Nn/VgsFmPGS0LV9JnmxTer48QBveL8nDfZc4eN21V0K4qumlDyv96PPuv",
-	"ggLvBsj+gVFObgFk/1Xl3QPS+MPhnwQP6kPl0Vd8z66C7J8ei/6u0ucNID3AsTWlzxuuZ4NXVypK7+07",
-	"7dQk2+KfSYK38Y43kN/dsn/T+luoDN5irXNBa4InaaYWLqDN+irLoDNJP5J+gyO4iFu9O1fwLUI6vxx5",
-	"ODptDOj8cxZ8f5CYUVu8j0p0chyopP7IMAb9M1e5WLb0rdPDIprROWk2uldPsF2iTJBexjNwrsRmwex6",
-	"uLtMYdGffkS2eYu5av8F1R8BLJ/EKKaCRCpZmEqcmiOYPr6TSHCtCcBzLhbNUSLmiPwkeHpoZ7PmPrRn",
-	"yhrDyjjDdNGLscK9ueM2K0xonxHd6eIpNcNDlKGXP6INcq2EqTGBJlrzQXRSLKkpoS+BJjf9AW8PGiyb",
-	"9CMZTcdtRrmiWshrW40FRblUPHV7f3KMNqD62JQwvRda1J+AJJsJPqcxiStj7Mx5YlZ1u2FBb2p31UJF",
-	"UTrOKRdmcA8iw7S5kKYfaVZlC0VIzJgyDINbW5ejeqZMEr/uD1PmAnDsHrlRfLvCrOa34ZQdTYlQCdMu",
-	"ouLcQDxvfrvmHvM15ydDuTutctu58JzVxut2+VEt05buovBDkTt3v2br919PSg+VjzKbx5rO54VC2mQ2",
-	"/7pIcHB/98N9m8vfP+IU0JfEKd+eqRwa0C2GCOYVxHTHZE4SnqVQkRze7XQ7uUg6B52ZUtnB1hbEfs+4",
-	"VAd7z5/udj59+PT/BwAA//+uhiQVbu4BAA==",
+	"w3gBFgkje34fIwNESRQlXJKKg+fx4FFZQ1dNZmw2FLk17unhxbkr4NMmKOTcfnruvvwKdO91sSJuzMhN",
+	"996DRpZH8Jhza+XSbCZc1EGM1kWTfPWE9OW2ZGmqbSjkG23e3MrYijC1nrDMIuwHsSnohnPFU6xoBMWE",
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+	"OtEfAPeh2rmgZIIynEuipbo8JShaRJormupRBEczFOFM5YJAYTyCUspomqc+lLTesTkG2IuL7fSii8a5",
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+	"p0ThGCsMgs6FPvEjkxd0UdTYNWo9I9clNcRDJnL2vSkSoJu9cAO9QARQsKmcFbUYIxwTFgXRoc+/bjb2",
+	"5W3R50TVJ/pAkUG34qUPGSrk21zdcL6OKKJHFt7Mhd3GNmx+hdArm1XYakKFI6N/zyNt5urm+EAOpmKJ",
+	"V53ir8OzVBDdV+Ndenj3ERcozk133qkEMv+z+oQKhuIHW0GyptnG2zqGiqJzxTLfiOdt/eH+PLmFLe8r",
+	"4YTdRsW+qbxROemvgeXaVb0Vz30gI6a1Jfk2uYdjwS6i68HEJy48LvdYjK2WYZujWfBtnzspgUH74uwb",
+	"266zbRvwcFu27WyzSy59j5FT1oMY0TAHt2bcRlZtTQf/ptkotdl5LPPBWWTpubg3tnhSMELDGjO8SDiO",
+	"/wxBwiv8RxEXwiBKAEbFY0I09ayGfnoA2ObKumldl635/vR0s4lLCLWSRwj1iDmEl5KjP0vjZQPu6zkR",
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+	"jWdINhxRnq1SlXj2pw9htRLcN7vC47QrAMhTMZuNqcARCMVylquYX7GwDWHOkzzV/zB/nKyDClM4mr2H",
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+	"9as5W/d989kxOIQNfz0eyzE3lOZmovhq69MVps3Wpx8THl1KC8Ximw213gaQ5frHEmLaughBTIDMUGQh",
+	"jAxQFpHdIasZIA3ij0QYKSJSynCyBXM2jQBYtrNi4TmnkKAdQZ5KT9IYMJMSQMQG+Ds9GzBUuQY8j660",
+	"xar8d3xnpOJoTCKeEgcgvhlS3f6GqfqJiyoa+NfCF9966w+QgJiCvX0NAHpzj58FiH6KryFUOs6tQ9mN",
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+	"+krGcmMJyfPirXYlJItWvaxEL2NvJTDcqMTajjs3i/oLdH5JG7ED7aObZRH/oj9q2Xc1WzU8CPvoM2f5",
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+	"qyfYLlEmSC/jGThXYrNgdj3cXaaw6E8/Itu8xVy1/4LakwDVT2IUU0EilSxMHVDNEUwf30kkuNYE4DkX",
+	"i+YoEXNEfhI8PbSzWXMf2jNljWFlnGG66MVY4d7ccZsVJrTPiO508ZSa4SHK0Msf0Qa5VsJUuEATrfkg",
+	"OimW1BTwl0CTm/6AtwcNlk36kYym4zajXFGr5LWtBYOiXCqeur0/OUYbUPtsSpjeCy3qT0CSzQSf05jE",
+	"lTF25jwxq7rdsKA3tbtqoaIoXOeUCzO4B5Fh2lxI0480q7KFIiRmTBmGwa2tClI9UyaJX/eHKXMBOHaP",
+	"3Ci+XWFW89twyo6mRKjDaRdRcW4gnje/XXOP+Zrzk6HcnVa57Vx4zmrjdbv8qJZpS3dR+KHInbtfs/X7",
+	"ryelh8pHmc1jTefzQiFtMpt/XSQ4uL/74b7N5e8fcQroS+KUb89UDg3oFkME8wpiumMyJwnPUqiHDu92",
+	"up1cJJ2Dzkyp7GBrC2K/Z1yqg73nT3c7nz58+v8DAAD//xqpZv3s7gEA",
 }
 
 // GetSwagger returns the content of the embedded swagger specification file
diff --git a/openapi.yaml b/openapi.yaml
index eac70a5ee..d6016524d 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -2995,6 +2995,12 @@ paths:
             application/json:
               schema:
                 $ref: "#/components/schemas/Error"
+        "499":
+          description: Client closed request
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
         500:
           description: Internal server error
           content: