diff --git a/enervent-ctrl-go/go.mod b/enervent-ctrl-go/go.mod
index dd02073..bec317b 100644
--- a/enervent-ctrl-go/go.mod
+++ b/enervent-ctrl-go/go.mod
@@ -3,6 +3,7 @@ module github.com/0ranki/enervent-ctrl/enervent-ctrl-go
 go 1.18
 
 require (
+	github.com/0ranki/https-go v0.0.0-20230314064508-ba9a558db433
 	github.com/goburrow/modbus v0.1.0
 	github.com/gorilla/handlers v1.5.1
 )
@@ -12,5 +13,4 @@ require golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 // indirect
 require (
 	github.com/felixge/httpsnoop v1.0.1 // indirect
 	github.com/goburrow/serial v0.1.0 // indirect
-	github.com/rocketlaunchr/https-go v0.0.0-20200218083740-ba6c48f29f4d
 )
diff --git a/enervent-ctrl-go/go.sum b/enervent-ctrl-go/go.sum
index 8721e5c..d617551 100644
--- a/enervent-ctrl-go/go.sum
+++ b/enervent-ctrl-go/go.sum
@@ -1,3 +1,5 @@
+github.com/0ranki/https-go v0.0.0-20230314064508-ba9a558db433 h1:QT2IRJnhIdCSr26LJktnZnBpHdiLfTrUFzLSdP3h9Wo=
+github.com/0ranki/https-go v0.0.0-20230314064508-ba9a558db433/go.mod h1:r4Jb05+PuiVKHDYwSsSBuSz4LpOlC2DgOY4N58+K8Hk=
 github.com/felixge/httpsnoop v1.0.1 h1:lvB5Jl89CsZtGIWuTcDM1E/vkVs49/Ml7JJe07l8SPQ=
 github.com/felixge/httpsnoop v1.0.1/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U=
 github.com/goburrow/modbus v0.1.0 h1:DejRZY73nEM6+bt5JSP6IsFolJ9dVcqxsYbpLbeW/ro=
@@ -6,7 +8,5 @@ github.com/goburrow/serial v0.1.0 h1:v2T1SQa/dlUqQiYIT8+Cu7YolfqAi3K96UmhwYyuSrA
 github.com/goburrow/serial v0.1.0/go.mod h1:sAiqG0nRVswsm1C97xsttiYCzSLBmUZ/VSlVLZJ8haA=
 github.com/gorilla/handlers v1.5.1 h1:9lRY6j8DEeeBT10CvO9hGW0gmky0BprnvDI5vfhUHH4=
 github.com/gorilla/handlers v1.5.1/go.mod h1:t8XrUpc4KVXb7HGyJ4/cEnwQiaxrX/hz1Zv/4g96P1Q=
-github.com/rocketlaunchr/https-go v0.0.0-20200218083740-ba6c48f29f4d h1:bL0c7wxznxDDQ+ebCpGN5T20ATeYDXedomXbQHwFwHA=
-github.com/rocketlaunchr/https-go v0.0.0-20200218083740-ba6c48f29f4d/go.mod h1:kDbnFcjPe/2KqPfycPSq0Ripnddx0DtCC2M1k95myWQ=
 golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 h1:H2TDz8ibqkAF6YGhCdN3jS9O0/s90v0rJh3X/OLHEUk=
 golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2/go.mod h1:K8+ghG5WaK9qNqU5K3HdILfMLy1f3aNYFI/wnl100a8=
diff --git a/enervent-ctrl-go/main.go b/enervent-ctrl-go/main.go
index 4ee62e3..92ac073 100644
--- a/enervent-ctrl-go/main.go
+++ b/enervent-ctrl-go/main.go
@@ -15,8 +15,8 @@ import (
 	"time"
 
 	"github.com/0ranki/enervent-ctrl/enervent-ctrl-go/pingvinKL"
+	"github.com/0ranki/https-go"
 	"github.com/gorilla/handlers"
-	"github.com/rocketlaunchr/https-go"
 )
 
 // Remember to dereference the symbolic links under ./static/html
@@ -26,7 +26,7 @@ import (
 var static embed.FS
 
 var (
-	version      = "0.0.20"
+	version      = "0.0.21"
 	pingvin      pingvinKL.PingvinKL
 	DEBUG        *bool
 	INTERVAL     *int
@@ -50,6 +50,10 @@ func authHandlerFunc(next http.HandlerFunc) http.HandlerFunc {
 				return
 			}
 		}
+		if len(user) == 0 {
+			user = "-"
+		}
+		log.Println("Authentication failed: IP:", r.RemoteAddr, "URI:", r.RequestURI, "username:", user)
 		w.Header().Set("WWW-Authenticate", `Basic realm="restricted", charset="UTF-8"`)
 		http.Error(w, "Unauthorized", http.StatusUnauthorized)
 	})
@@ -69,6 +73,10 @@ func authHandler(next http.Handler) http.HandlerFunc {
 				return
 			}
 		}
+		if len(user) == 0 {
+			user = "-"
+		}
+		log.Println("Authentication failed: IP:", r.RemoteAddr, "URI:", r.RequestURI, "username:", user)
 		w.Header().Set("WWW-Authenticate", `Basic realm="restricted", charset="UTF-8"`)
 		http.Error(w, "Unauthorized", http.StatusUnauthorized)
 	})
@@ -201,6 +209,7 @@ func generateCertificate(certpath, cert, key string) {
 	}
 	opts := https.GenerateOptions{Host: "enervent-ctrl.local", RSABits: 4096, ValidFor: 10 * 365 * 24 * time.Hour}
 	log.Println("Generating new self-signed SSL keypair to ", certpath)
+	log.Println("This may take a while...")
 	pub, priv, err := https.GenerateKeys(opts)
 	if err != nil {
 		log.Fatal("Error generating SSL certificate: ", err)