diff --git a/client/client.go b/client/client.go
index 84d31f1f..e1e02f68 100755
--- a/client/client.go
+++ b/client/client.go
@@ -7,6 +7,7 @@ import (
 	"net"
 	"net/http"
 	"strconv"
+	"sync"
 	"time"
 
 	"github.com/astaxie/beego/logs"
@@ -29,6 +30,7 @@ type TRPClient struct {
 	ticker         *time.Ticker
 	cnf            *config.Config
 	disconnectTime int
+	once           sync.Once
 }
 
 //new client
@@ -41,6 +43,7 @@ func NewRPClient(svraddr string, vKey string, bridgeConnType string, proxyUrl st
 		proxyUrl:       proxyUrl,
 		cnf:            cnf,
 		disconnectTime: disconnectTime,
+		once:           sync.Once{},
 	}
 }
 
@@ -290,13 +293,17 @@ loop:
 }
 
 func (s *TRPClient) Close() {
+	s.once.Do(s.closing)
+}
+
+func (s *TRPClient) closing() {
 	CloseClient = true
 	NowStatus = 0
 	if s.tunnel != nil {
-		s.tunnel.Close()
+		_ = s.tunnel.Close()
 	}
 	if s.signal != nil {
-		s.signal.Close()
+		_ = s.signal.Close()
 	}
 	if s.ticker != nil {
 		s.ticker.Stop()
diff --git a/go.mod b/go.mod
index f04c30e3..8d4c06b6 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module ehang.io/nps
 go 1.13
 
 require (
-	ehang.io/nps-mux v0.0.0-20200610152202-c424c819296f
+	ehang.io/nps-mux v0.0.0-20200617154922-5dc86cc6082a
 	fyne.io/fyne v1.2.4
 	github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d // indirect
 	github.com/astaxie/beego v1.12.0
@@ -28,8 +28,8 @@ require (
 	golang.org/x/crypto v0.0.0-20200604202706-70a84ac30bf9 // indirect
 	golang.org/x/mod v0.3.0 // indirect
 	golang.org/x/net v0.0.0-20200602114024-627f9648deb9
-	golang.org/x/sys v0.0.0-20200610111108-226ff32320da // indirect
-	golang.org/x/tools v0.0.0-20200610052024-8d7dbee4c8ae // indirect
+	golang.org/x/sys v0.0.0-20200615200032-f1bc736245b1 // indirect
+	golang.org/x/tools v0.0.0-20200617042924-7f3f4b10a808 // indirect
 )
 
 replace github.com/astaxie/beego => github.com/exfly/beego v1.12.0-export-init
diff --git a/go.sum b/go.sum
index 8202f065..bf115413 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,5 @@
-ehang.io/nps-mux v0.0.0-20200610152202-c424c819296f h1:MfYCE8jqoxwkICN3NKVK0qDrI4eac5loHxkBVADGAa8=
-ehang.io/nps-mux v0.0.0-20200610152202-c424c819296f/go.mod h1:hTpHjFEac582vs7OjOaN8R2o3EOPOs2qeBeqTvIQAgs=
+ehang.io/nps-mux v0.0.0-20200617154922-5dc86cc6082a h1:cSqulLdhRBxoE1cOa7li3hwcmmcH/y4xddA7WUG4xFw=
+ehang.io/nps-mux v0.0.0-20200617154922-5dc86cc6082a/go.mod h1:hTpHjFEac582vs7OjOaN8R2o3EOPOs2qeBeqTvIQAgs=
 fyne.io/fyne v1.2.4 h1:QN5GQEZ9FANvFxkIQLQ5qnmmpSwBAoDiH8hQiuz2Zyo=
 fyne.io/fyne v1.2.4/go.mod h1:nsGex1XH/8p/kq6KiQV4bNu0XTKaFJRbZEOOj4fqJF8=
 github.com/Knetic/govaluate v3.0.0+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
@@ -163,8 +163,8 @@ golang.org/x/sys v0.0.0-20190626221950-04f50cda93cb/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200302150141-5c8b2ff67527 h1:uYVVQ9WP/Ds2ROhcaGPeIdVq0RIXVLwsHlnvJ+cT1So=
 golang.org/x/sys v0.0.0-20200302150141-5c8b2ff67527/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200610111108-226ff32320da h1:bGb80FudwxpeucJUjPYJXuJ8Hk91vNtfvrymzwiei38=
-golang.org/x/sys v0.0.0-20200610111108-226ff32320da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200615200032-f1bc736245b1 h1:ogLJMz+qpzav7lGMh10LMvAkM/fAoGlaiiHYiFYdm80=
+golang.org/x/sys v0.0.0-20200615200032-f1bc736245b1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/tools v0.0.0-20190808195139-e713427fea3f/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
@@ -172,8 +172,8 @@ golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtn
 golang.org/x/tools v0.0.0-20200117012304-6edc0a871e69/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
 golang.org/x/tools v0.0.0-20200425043458-8463f397d07c h1:iHhCR0b26amDCiiO+kBguKZom9aMF+NrFxh9zeKR/XU=
 golang.org/x/tools v0.0.0-20200425043458-8463f397d07c/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
-golang.org/x/tools v0.0.0-20200610052024-8d7dbee4c8ae h1:Tzc/wv256GkBNOkrWbHBeV3T08mrVevgo/q5KSGltr0=
-golang.org/x/tools v0.0.0-20200610052024-8d7dbee4c8ae/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
+golang.org/x/tools v0.0.0-20200617042924-7f3f4b10a808 h1:t4rDo0JMqBOEHVnboBBPY/e1U1exx2OO5lL/TcfJM28=
+golang.org/x/tools v0.0.0-20200617042924-7f3f4b10a808/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=