diff --git a/Makefile b/Makefile
index 8c8ec287..9ee2e6ea 100644
--- a/Makefile
+++ b/Makefile
@@ -78,7 +78,7 @@ build: vendor go.work snclient.ini server.crt server.key
 build-watch: vendor
 	ls cmd/*/*.go pkg/*/*.go pkg/*/*/*.go snclient.ini | entr -sr "$(MAKE) && ./snclient $(filter-out $@,$(MAKECMDGOALS))"
 
-# run build watch with other build targets, ex.: make build-watch-any -- build-windows-amd64
+# run build watch with other build targets, ex.: make build-watch-make -- build-windows-amd64
 build-watch-make: vendor
 	ls cmd/*/*.go pkg/*/*.go pkg/*/*/*.go snclient.ini | entr -sr "$(MAKE) $(filter-out $@,$(MAKECMDGOALS))"
 
diff --git a/README.md b/README.md
index f97beb3b..c4042d7e 100644
--- a/README.md
+++ b/README.md
@@ -45,9 +45,10 @@ X: completed
 | check_memory           |    X    |    X    |    X    |    X    |
 | check_network          |    W    |    W    |    W    |    W    |
 | check_os_version       |    X    |    X    |    X    |    X    |
+| check_pagefile         |         |         |         |         |
 | check_process          |    W    |    W    |    W    |    W    |
 | check_service          |    X    |         |         |         |
-| check_snclient_version |    X    |         |         |         |
+| check_snclient_version |    X    |    X    |    X    |    X    |
 | check_uptime           |    X    |    X    |    X    |    X    |
 | check_wmi              |    W    |         |         |         |
 | check_wrap             |    W    |    W    |    W    |    W    |
diff --git a/pkg/snclient/check_cpu.go b/pkg/snclient/check_cpu.go
index d81f73e5..28c3f549 100644
--- a/pkg/snclient/check_cpu.go
+++ b/pkg/snclient/check_cpu.go
@@ -55,7 +55,7 @@ func (l *CheckCPU) Check(snc *Agent, args []string) (*CheckResult, error) {
 			check.listData = append(check.listData, map[string]string{
 				"time": time,
 				"core": name,
-				"load": fmt.Sprintf("%f", avg),
+				"load": fmt.Sprintf("%.0f", utils.ToPrecision(avg, 0)),
 			})
 			check.result.Metrics = append(check.result.Metrics, &CheckMetric{
 				ThresholdName: "load",
diff --git a/pkg/snclient/check_service_windows.go b/pkg/snclient/check_service_windows.go
index 3b510aeb..384cb050 100644
--- a/pkg/snclient/check_service_windows.go
+++ b/pkg/snclient/check_service_windows.go
@@ -189,36 +189,11 @@ func (l *CheckService) addService(check *CheckData, ctrlMgr *mgr.Mgr, service st
 
 	check.listData = append(check.listData, listEntry)
 
-	if len(services) == 0 {
+	if len(services) == 0 && !check.showAll {
 		return nil
 	}
 
-	check.result.Metrics = append(check.result.Metrics, &CheckMetric{
-		Name:  service,
-		Value: float64(statusCode.State),
-	})
-	if mem != nil {
-		check.result.Metrics = append(
-			check.result.Metrics,
-			&CheckMetric{
-				Name:  fmt.Sprintf("%s rss", service),
-				Value: float64(mem.RSS),
-				Unit:  "B",
-			},
-			&CheckMetric{
-				Name:  fmt.Sprintf("%s vms", service),
-				Value: float64(mem.VMS),
-				Unit:  "B",
-			},
-		)
-	}
-	if cpu != nil {
-		check.result.Metrics = append(check.result.Metrics, &CheckMetric{
-			Name:  fmt.Sprintf("%s cpu", service),
-			Value: utils.ToPrecision(*cpu, 1),
-			Unit:  "%",
-		})
-	}
+	l.addMetrics(check, service, statusCode, mem, cpu)
 
 	return nil
 }
@@ -313,3 +288,55 @@ func (l *CheckService) svcStartType(startType uint32, delayed bool) string {
 
 	return "unknown"
 }
+
+func (l *CheckService) addMetrics(check *CheckData, service string, statusCode *svc.Status, mem *process.MemoryInfoStat, cpu *float64) {
+	check.result.Metrics = append(check.result.Metrics, &CheckMetric{
+		Name:  service,
+		Value: float64(statusCode.State),
+	})
+	if mem != nil {
+		check.result.Metrics = append(
+			check.result.Metrics,
+			&CheckMetric{
+				Name:     fmt.Sprintf("%s rss", service),
+				Value:    float64(mem.RSS),
+				Unit:     "B",
+				Warning:  check.TransformThreshold(check.warnThreshold, "rss", fmt.Sprintf("%s rss", service), "B", "B", 0),
+				Critical: check.TransformThreshold(check.warnThreshold, "rss", fmt.Sprintf("%s rss", service), "B", "B", 0),
+			},
+			&CheckMetric{
+				Name:     fmt.Sprintf("%s vms", service),
+				Value:    float64(mem.VMS),
+				Unit:     "B",
+				Warning:  check.TransformThreshold(check.warnThreshold, "vms", fmt.Sprintf("%s vms", service), "B", "B", 0),
+				Critical: check.TransformThreshold(check.warnThreshold, "vms", fmt.Sprintf("%s vms", service), "B", "B", 0),
+			},
+		)
+	} else {
+		check.result.Metrics = append(
+			check.result.Metrics,
+			&CheckMetric{
+				Name:  fmt.Sprintf("%s rss", service),
+				Value: "U",
+			},
+			&CheckMetric{
+				Name:  fmt.Sprintf("%s vms", service),
+				Value: "U",
+			},
+		)
+	}
+	if cpu != nil {
+		check.result.Metrics = append(check.result.Metrics, &CheckMetric{
+			Name:     fmt.Sprintf("%s cpu", service),
+			Value:    utils.ToPrecision(*cpu, 1),
+			Unit:     "%",
+			Warning:  check.warnThreshold,
+			Critical: check.critThreshold,
+		})
+	} else {
+		check.result.Metrics = append(check.result.Metrics, &CheckMetric{
+			Name:  fmt.Sprintf("%s cpu", service),
+			Value: "U",
+		})
+	}
+}
diff --git a/pkg/snclient/check_uptime.go b/pkg/snclient/check_uptime.go
index d2113e5a..25942234 100644
--- a/pkg/snclient/check_uptime.go
+++ b/pkg/snclient/check_uptime.go
@@ -43,8 +43,9 @@ func (l *CheckUptime) Check(_ *Agent, args []string) (*CheckResult, error) {
 	uptime := time.Since(time.Unix(int64(bootTime), 0))
 
 	check.listData = append(check.listData, map[string]string{
-		"uptime": utils.DurationString(uptime.Truncate(time.Minute)),
-		"boot":   time.Unix(int64(bootTime), 0).UTC().Format("2006-01-02 15:04:05"),
+		"uptime":       utils.DurationString(uptime.Truncate(time.Minute)),
+		"uptime_value": fmt.Sprintf("%.1f", uptime.Seconds()),
+		"boot":         time.Unix(int64(bootTime), 0).UTC().Format("2006-01-02 15:04:05"),
 	})
 
 	check.result.Metrics = append(check.result.Metrics, &CheckMetric{
diff --git a/pkg/snclient/check_wrap.go b/pkg/snclient/check_wrap.go
index 62278dab..d32cb186 100644
--- a/pkg/snclient/check_wrap.go
+++ b/pkg/snclient/check_wrap.go
@@ -60,7 +60,7 @@ func (l *CheckWrap) Check(_ *Agent, args []string) (*CheckResult, error) {
 		log.Debugf("executing command: %s %s", winExecutable, "Set-ExecutionPolicy -Scope Process Unrestricted -Force;"+formattedCommand+"; $LASTEXITCODE")
 		scriptOutput, err = exec.Command(winExecutable, "Set-ExecutionPolicy -Scope Process Unrestricted -Force;"+formattedCommand+"; $LASTEXITCODE").CombinedOutput()
 	case "linux":
-		log.Debugf("executing command: %s", formattedCommand + "; echo $?")
+		log.Debugf("executing command: %s", formattedCommand+"; echo $?")
 		scriptOutput, err = exec.Command(formattedCommand + "; echo $?").CombinedOutput()
 	}
 
diff --git a/pkg/snclient/checkmetric.go b/pkg/snclient/checkmetric.go
index a5fda4a4..647ad61d 100644
--- a/pkg/snclient/checkmetric.go
+++ b/pkg/snclient/checkmetric.go
@@ -24,6 +24,11 @@ type CheckMetric struct {
 func (m *CheckMetric) String() string {
 	var res bytes.Buffer
 
+	// Unknown value
+	if fmt.Sprintf("%v", m.Value) == "U" {
+		return fmt.Sprintf("'%s'=U", m.Name)
+	}
+
 	res.WriteString(fmt.Sprintf("'%s'=%s%s", m.Name, convert.Num2String(m.Value), m.Unit))
 
 	res.WriteString(";")
diff --git a/pkg/snclient/checkmetric_test.go b/pkg/snclient/checkmetric_test.go
new file mode 100644
index 00000000..8f17c69c
--- /dev/null
+++ b/pkg/snclient/checkmetric_test.go
@@ -0,0 +1,21 @@
+package snclient
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCheckMetricsString(t *testing.T) {
+	for _, check := range []struct {
+		metric CheckMetric
+		expect string
+	}{
+		{CheckMetric{Name: "val", Value: "13", Unit: "B"}, `'val'=13B`},
+		{CheckMetric{Name: "val", Value: "0.5", Unit: ""}, `'val'=0.5`},
+		{CheckMetric{Name: "val", Value: "U", Unit: ""}, `'val'=U`},
+	} {
+		res := check.metric.String()
+		assert.Equalf(t, check.expect, res, "CheckMetric.String() ->> %s", res)
+	}
+}
diff --git a/pkg/snclient/condition.go b/pkg/snclient/condition.go
index 20a25ea4..77ae152e 100644
--- a/pkg/snclient/condition.go
+++ b/pkg/snclient/condition.go
@@ -270,7 +270,12 @@ func (c *Condition) getVarValue(data map[string]string) (val string, ok bool) {
 		}
 	}
 
-	varStr, ok := data[c.keyword]
+	varStr, ok := data[c.keyword+"_value"]
+	if ok {
+		return varStr, ok
+	}
+
+	varStr, ok = data[c.keyword]
 
 	return varStr, ok
 }
@@ -385,6 +390,12 @@ func conditionNext(token []string) (cond *Condition, remaining []string, err err
 	}
 	query := keyword
 
+	// trim quotes from keyword
+	keyword, err = utils.TrimQuotes(keyword)
+	if err != nil {
+		return nil, nil, fmt.Errorf("%s", err.Error())
+	}
+
 	cond = &Condition{
 		keyword: keyword,
 	}
diff --git a/pkg/snclient/condition_test.go b/pkg/snclient/condition_test.go
index 976432b2..b11a44ae 100644
--- a/pkg/snclient/condition_test.go
+++ b/pkg/snclient/condition_test.go
@@ -120,6 +120,8 @@ func TestConditionCompare(t *testing.T) {
 		{"test regex 'a+'", "test", "bbbb", false},
 		{"test !~ 'a+'", "test", "bbb", true},
 		{"test !~ 'a+'", "test", "aa", false},
+		{"'test space' > 5", "test space", "2", false},
+		{"'test space' < 5", "test space", "2", true},
 	} {
 		threshold, err := NewCondition(check.threshold)
 		assert.NoErrorf(t, err, "parsed threshold")
diff --git a/pkg/snclient/listen_web.go b/pkg/snclient/listen_web.go
index d3c922c8..9e54d4a4 100644
--- a/pkg/snclient/listen_web.go
+++ b/pkg/snclient/listen_web.go
@@ -49,6 +49,9 @@ type CheckWebPerfNumber struct {
 }
 
 func (n CheckWebPerfNumber) MarshalJSON() ([]byte, error) {
+	if fmt.Sprintf("%v", n.num) == "U" {
+		return []byte(`"U"`), nil
+	}
 	val, err := convert.Num2StringE(n.num)
 	if err != nil {
 		return nil, fmt.Errorf("num2string: %s", err.Error())
@@ -257,6 +260,10 @@ func (l *HandlerWebLegacy) ServeHTTP(res http.ResponseWriter, req *http.Request)
 	// check clear text password
 	if !l.Handler.verifyPassword(req.Header.Get("Password")) {
 		http.Error(res, http.StatusText(http.StatusForbidden), http.StatusForbidden)
+		res.Header().Set("Content-Type", "application/json")
+		LogError(json.NewEncoder(res).Encode(map[string]interface{}{
+			"error": "permission denied",
+		}))
 
 		return
 	}
@@ -310,6 +317,10 @@ func (l *HandlerWebV1) ServeHTTP(res http.ResponseWriter, req *http.Request) {
 	_, password, _ := req.BasicAuth()
 	if !l.Handler.verifyPassword(password) {
 		http.Error(res, http.StatusText(http.StatusForbidden), http.StatusForbidden)
+		res.Header().Set("Content-Type", "application/json")
+		LogError(json.NewEncoder(res).Encode(map[string]interface{}{
+			"error": "permission denied",
+		}))
 
 		return
 	}
diff --git a/pkg/utils/utils.go b/pkg/utils/utils.go
index 71900ee8..a6e1aff6 100644
--- a/pkg/utils/utils.go
+++ b/pkg/utils/utils.go
@@ -212,6 +212,29 @@ func TokenizeBy(str, separator string) []string {
 	return tokens
 }
 
+func TrimQuotes(str string) (res string, err error) {
+	switch {
+	case strings.HasPrefix(str, "'"):
+		if !strings.HasSuffix(str, "'") || len(str) == 1 {
+			return "", fmt.Errorf("unbalanced quotes in '%s'", str)
+		}
+		str = strings.TrimPrefix(str, "'")
+		str = strings.TrimSuffix(str, "'")
+	case strings.HasPrefix(str, `"`):
+		if !strings.HasSuffix(str, `"`) || len(str) == 1 {
+			return "", fmt.Errorf("unbalanced quotes in '%s'", str)
+		}
+		str = strings.TrimPrefix(str, `"`)
+		str = strings.TrimSuffix(str, `"`)
+	case strings.HasSuffix(str, "'"):
+		return "", fmt.Errorf("unbalanced quotes in '%s'", str)
+	case strings.HasSuffix(str, `"`):
+		return "", fmt.Errorf("unbalanced quotes in '%s'", str)
+	}
+
+	return str, nil
+}
+
 func ParseVersion(str string) (num float64) {
 	str = strings.TrimPrefix(str, "v")
 	token := strings.Split(str, ".")
diff --git a/pkg/utils/utils_test.go b/pkg/utils/utils_test.go
index 3217fbba..581937e1 100644
--- a/pkg/utils/utils_test.go
+++ b/pkg/utils/utils_test.go
@@ -119,3 +119,33 @@ func TestDurationString(t *testing.T) {
 		assert.Equalf(t, tst.res, res, "DurationString: %v -> %v", tst.in, res)
 	}
 }
+
+func TestTrimQuotes(t *testing.T) {
+	tests := []struct {
+		in  string
+		res string
+		err bool
+	}{
+		{`"test"`, `test`, false},
+		{`'test'`, `test`, false},
+		{`'test test'`, `test test`, false},
+		{`"test test"`, `test test`, false},
+		{`"test test`, "", true},
+		{`'test test`, "", true},
+		{`test"test`, `test"test`, false},
+		{`test'test`, `test'test`, false},
+		{`test test'`, "", true},
+		{`test test"`, "", true},
+	}
+
+	for _, tst := range tests {
+		res, err := TrimQuotes(tst.in)
+		switch tst.err {
+		case true:
+			assert.Errorf(t, err, "TrimQuotes should error on %s", tst.in)
+		case false:
+			assert.Nilf(t, err, "TrimQuotes should not error on %s", tst.in)
+			assert.Equalf(t, tst.res, res, "TrimQuotes: %v -> %v", tst.in, res)
+		}
+	}
+}