diff --git a/CHANGELOG.md b/CHANGELOG.md
index fd43991..1313158 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -109,4 +109,9 @@
 # v0.8.4
 
 1. 升级go版本到1.18.1
-2. 支持arm环境编译
\ No newline at end of file
+2. 支持arm环境编译
+
+# v0.8.5
+
+1. 升级go版本到1.18.3
+2. 修正连接失败时的panic问题
\ No newline at end of file
diff --git a/build b/build
index 1b0c7d8..6abd9a8 100755
--- a/build
+++ b/build
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-VERSION=0.8.3
+VERSION=0.8.5
 
 DOCKER_BUILDKIT=1 docker build -t natpass -f contrib/build/Dockerfile .
 docker run --rm \
diff --git a/build_all b/build_all
index 9a54e18..739f4c4 100755
--- a/build_all
+++ b/build_all
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-VERSION=0.8.4
+VERSION=0.8.5
 
 DOCKER_BUILDKIT=1 docker build -t natpass -f contrib/build/Dockerfile .
 docker run --rm \
diff --git a/code/client/conn/conn.go b/code/client/conn/conn.go
index 5b55d0b..8c31b25 100644
--- a/code/client/conn/conn.go
+++ b/code/client/conn/conn.go
@@ -35,7 +35,9 @@ func New(cfg *global.Configure) *Conn {
 		write:       make(chan *network.Msg, 1024),
 		drop:        make(map[string]time.Time),
 	}
-	conn.conn = conn.connect()
+	var err error
+	conn.conn, err = conn.tryConnect()
+	runtime.Assert(err)
 	go conn.loopRead()
 	go conn.loopWrite()
 	go conn.keepalive()
@@ -43,13 +45,7 @@ func New(cfg *global.Configure) *Conn {
 	return conn
 }
 
-func (conn *Conn) connect() *network.Conn {
-	defer func() {
-		if err := recover(); err != nil {
-			logging.Error("connect error: %v", err)
-			panic(err)
-		}
-	}()
+func (conn *Conn) connect() (*network.Conn, error) {
 	var dial net.Conn
 	var err error
 	if conn.cfg.UseSSL {
@@ -57,12 +53,32 @@ func (conn *Conn) connect() *network.Conn {
 	} else {
 		dial, err = net.Dial("tcp", conn.cfg.Server)
 	}
-	runtime.Assert(err)
+	if err != nil {
+		logging.Error("dial: %v", err)
+		return nil, err
+	}
 	cn := network.NewConn(dial)
 	err = writeHandshake(cn, conn.cfg)
-	runtime.Assert(err)
+	if err != nil {
+		logging.Error("write handshake: %v", err)
+		return nil, err
+	}
 	logging.Info("%s connected", conn.cfg.Server)
-	return cn
+	return cn, nil
+}
+
+func (conn *Conn) tryConnect() (*network.Conn, error) {
+	var ret *network.Conn
+	var err error
+	for i := 0; i < 10; i++ {
+		ret, err = conn.connect()
+		if err == nil {
+			return ret, nil
+		}
+		logging.Error("connect error on %d times: %v", i+1, err)
+		time.Sleep(time.Second)
+	}
+	return nil, err
 }
 
 func writeHandshake(conn *network.Conn, cfg *global.Configure) error {
@@ -88,14 +104,16 @@ func (conn *Conn) loopRead() {
 				timeout++
 				if timeout >= 60 {
 					logging.Error("too many timeout times")
-					conn.conn = conn.connect()
+					conn.conn, err = conn.tryConnect()
+					runtime.Assert(err)
 					timeout = 0
 					continue
 				}
 				continue
 			}
 			logging.Error("read message: %v", err)
-			conn.conn = conn.connect()
+			conn.conn, err = conn.tryConnect()
+			runtime.Assert(err)
 			continue
 		}
 		timeout = 0
@@ -137,7 +155,8 @@ func (conn *Conn) loopWrite() {
 		if err != nil {
 			logging.Error("write message error on %s: %v",
 				conn.cfg.ID, err)
-			conn.conn = conn.connect()
+			conn.conn, err = conn.connect()
+			runtime.Assert(err)
 			continue
 		}
 	}
diff --git a/contrib/build/Dockerfile b/contrib/build/Dockerfile
index 3162c62..f18b5b7 100644
--- a/contrib/build/Dockerfile
+++ b/contrib/build/Dockerfile
@@ -1,6 +1,6 @@
 ARG APT_MIRROR=mirrors.ustc.edu.cn
 ARG LIBPNG_VERSION=1.6.37
-ARG GO_VERSION=1.18.1
+ARG GO_VERSION=1.18.3
 ARG GO_PROXY=https://goproxy.cn,direct
 
 FROM debian:stable-slim
diff --git a/go.mod b/go.mod
index fdc162f..dc994b9 100644
--- a/go.mod
+++ b/go.mod
@@ -8,15 +8,16 @@ require (
 	github.com/go-bindata/go-bindata/v3 v3.1.3
 	github.com/gorilla/websocket v1.5.0
 	github.com/kardianos/service v1.2.1
-	github.com/kisielk/errcheck v1.6.0 // indirect
+	github.com/kisielk/errcheck v1.6.1 // indirect
 	github.com/lwch/logging v0.0.0-20220322084100-ec48185d95ab
 	github.com/lwch/rdesktop v1.0.0
 	github.com/lwch/runtime v0.0.0-20190520054850-8c97e19e0c6d
 	github.com/lwch/yaml v0.0.0-20211206085137-772f80e85a26
 	golang.org/x/lint v0.0.0-20210508222113-6edffad5e616 // indirect
-	golang.org/x/sys v0.0.0-20220503163025-988cb79eb6c6
+	golang.org/x/sys v0.0.0-20220614162138-6c1b26c55098
 	golang.org/x/text v0.3.7
-	golang.org/x/tools v0.1.10 // indirect
-	golang.org/x/xerrors v0.0.0-20220411194840-2f41105eb62f // indirect
+	golang.org/x/tools v0.1.11 // indirect
+	golang.org/x/xerrors v0.0.0-20220609144429-65e65417b02f // indirect
 	google.golang.org/protobuf v1.28.0
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/go.sum b/go.sum
index b69c770..540eb3a 100644
--- a/go.sum
+++ b/go.sum
@@ -12,8 +12,8 @@ github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/ad
 github.com/kardianos/service v1.2.1 h1:AYndMsehS+ywIS6RB9KOlcXzteWUzxgMgBymJD7+BYk=
 github.com/kardianos/service v1.2.1/go.mod h1:CIMRFEJVL+0DS1a3Nx06NaMn4Dz63Ng6O7dl0qH0zVM=
 github.com/kisielk/errcheck v1.2.0/go.mod h1:/BMXB+zMLi60iA8Vv6Ksmxu/1UDYcXs4uQLJ+jE2L00=
-github.com/kisielk/errcheck v1.6.0 h1:YTDO4pNy7AUN/021p+JGHycQyYNIyMoenM1YDVK6RlY=
-github.com/kisielk/errcheck v1.6.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8=
+github.com/kisielk/errcheck v1.6.1 h1:cErYo+J4SmEjdXZrVXGwLJCE2sB06s23LpkcyWNrT+s=
+github.com/kisielk/errcheck v1.6.1/go.mod h1:nXw/i/MfnvRHqXa7XXmQMUB0oNFGuBrNI8d8NLy0LPw=
 github.com/lwch/logging v0.0.0-20211115073745-0db19179db17/go.mod h1:aXQui5bsF/d4I+z6szuiBWY5m4y9t6pyZ2Q/sLgkBBg=
 github.com/lwch/logging v0.0.0-20220322084100-ec48185d95ab h1:zqeHtNXEg707Tq8gv5yE//rc6ue/SVSaUxlslbGBxrg=
 github.com/lwch/logging v0.0.0-20220322084100-ec48185d95ab/go.mod h1:aXQui5bsF/d4I+z6szuiBWY5m4y9t6pyZ2Q/sLgkBBg=
@@ -23,7 +23,6 @@ github.com/lwch/runtime v0.0.0-20190520054850-8c97e19e0c6d h1:Xg+zzPtvX22DaoJD5B
 github.com/lwch/runtime v0.0.0-20190520054850-8c97e19e0c6d/go.mod h1:uEt0zu1MDC7WnVvodPBGSYAD/KMKk0v36xE8UE5veM8=
 github.com/lwch/yaml v0.0.0-20211206085137-772f80e85a26 h1:sR3nbPhdfstDxYLp7c1EnsKH3z8+u+wgnhC3AI9/qf0=
 github.com/lwch/yaml v0.0.0-20211206085137-772f80e85a26/go.mod h1:Dz0eixDQvioB5pqCXGQJ6sTJetbS6TCHegLuRh2Bw2U=
-github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.4.1/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
@@ -32,16 +31,14 @@ golang.org/x/lint v0.0.0-20191125180803-fdd1cda4f05f/go.mod h1:5qLYkcX4OjUUV8bRu
 golang.org/x/lint v0.0.0-20210508222113-6edffad5e616 h1:VLliZ0d+/avPrXXH+OakdXhpJuEoBZuwh1m2j7U6Iug=
 golang.org/x/lint v0.0.0-20210508222113-6edffad5e616/go.mod h1:3xt1FjdF8hUf6vQPIChWIBhFzV8gjjsPE/fR3IyQdNY=
 golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
-golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
-golang.org/x/mod v0.6.0-dev.0.20220106191415-9b9b3d81d5e3 h1:kQgndtyPBW/JIYERgdxfwMYh3AVStj88WQTlNDi2a+o=
 golang.org/x/mod v0.6.0-dev.0.20220106191415-9b9b3d81d5e3/go.mod h1:3p9vT2HGsQu2K1YbXdKPJLVgG5VJdoTa1poYQBtP1AY=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 h1:6zppjxzCulZykYSLyVDYbneBfbaBIQPYMevg0bEwv2s=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20211015210444-4f30a5c0130f/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -50,8 +47,8 @@ golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211019181941-9d821ace8654/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220503163025-988cb79eb6c6 h1:nonptSpoQ4vQjyraW20DXPAglgQfVnM9ZC6MmNLMR60=
-golang.org/x/sys v0.0.0-20220503163025-988cb79eb6c6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220614162138-6c1b26c55098 h1:PgOr27OhUx2IRqGJ2RxAWI4dJQ7bi9cSrB82uzFzfUA=
+golang.org/x/sys v0.0.0-20220614162138-6c1b26c55098/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
@@ -63,19 +60,20 @@ golang.org/x/tools v0.0.0-20181030221726-6c7e314b6563/go.mod h1:n7NCudcB/nEzxVGm
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191125144606-a911d9008d1f/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20200130002326-2f3ba24bd6e7/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
-golang.org/x/tools v0.0.0-20200619180055-7c47624df98f/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
-golang.org/x/tools v0.1.10 h1:QjFRCZxdOhBJ/UNgnBZLbNV13DlbnK0quyivTnXJM20=
 golang.org/x/tools v0.1.10/go.mod h1:Uh6Zz+xoGYZom868N8YTex3t7RhtHDBrE8Gzo9bV56E=
+golang.org/x/tools v0.1.11 h1:loJ25fNOEhSXfHrpoGj91eCUThwdNX6u24rO1xnNteY=
+golang.org/x/tools v0.1.11/go.mod h1:SgwaegtQh8clINPpECJMqnxLv9I09HLqnW3RMqW0CA4=
 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/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20220411194840-2f41105eb62f h1:GGU+dLjvlC3qDwqYgL6UgRmHXhOOgns0bZu2Ty5mm6U=
-golang.org/x/xerrors v0.0.0-20220411194840-2f41105eb62f/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20220609144429-65e65417b02f h1:uF6paiQQebLeSXkrTqHqz0MXhXXS1KgF41eUdBNvxK0=
+golang.org/x/xerrors v0.0.0-20220609144429-65e65417b02f/go.mod h1:K8+ghG5WaK9qNqU5K3HdILfMLy1f3aNYFI/wnl100a8=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.28.0 h1:w43yiav+6bVFTBQFZX0r7ipe9JQ1QsbMgHwbBziscLw=
 google.golang.org/protobuf v1.28.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
 gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=