diff --git a/cmd/config.go b/cmd/config.go
index 7c5de54..08b8d27 100644
--- a/cmd/config.go
+++ b/cmd/config.go
@@ -131,7 +131,7 @@ func (r *Relay) Check() error {
 	if len(r.Remote) == 0 {
 		return errors.New("no relay remote address")
 	}
-	if r.Timeout != 0 && r.Timeout <= 4 {
+	if r.Timeout != 0 && r.Timeout < 4 {
 		return errors.New("invalid relay timeout")
 	}
 	return nil
@@ -236,16 +236,16 @@ func (c *clientConfig) Check() error {
 		len(c.TCPRedirect.Listen) == 0 {
 		return errors.New("please enable at least one mode")
 	}
-	if c.Connectivity.HandshakeIdleTimeout != 0 && c.Connectivity.HandshakeIdleTimeout <= 2 {
+	if c.Connectivity.HandshakeIdleTimeout != 0 && c.Connectivity.HandshakeIdleTimeout < 2 {
 		return errors.New("invalid handshake idle timeout")
 	}
-	if c.Connectivity.MaxIdleTimeout != 0 && c.Connectivity.MaxIdleTimeout <= 4 {
+	if c.Connectivity.MaxIdleTimeout != 0 && c.Connectivity.MaxIdleTimeout < 4 {
 		return errors.New("invalid max idle timeout")
 	}
-	if c.SOCKS5.Timeout != 0 && c.SOCKS5.Timeout <= 4 {
+	if c.SOCKS5.Timeout != 0 && c.SOCKS5.Timeout < 4 {
 		return errors.New("invalid SOCKS5 timeout")
 	}
-	if c.HTTP.Timeout != 0 && c.HTTP.Timeout <= 4 {
+	if c.HTTP.Timeout != 0 && c.HTTP.Timeout < 4 {
 		return errors.New("invalid HTTP timeout")
 	}
 	if c.TUN.Timeout != 0 && c.TUN.Timeout < 4 {
@@ -257,10 +257,10 @@ func (c *clientConfig) Check() error {
 	if len(c.UDPRelay.Listen) > 0 && len(c.UDPRelay.Remote) == 0 {
 		return errors.New("no UDP relay remote address")
 	}
-	if c.TCPRelay.Timeout != 0 && c.TCPRelay.Timeout <= 4 {
+	if c.TCPRelay.Timeout != 0 && c.TCPRelay.Timeout < 4 {
 		return errors.New("invalid TCP relay timeout")
 	}
-	if c.UDPRelay.Timeout != 0 && c.UDPRelay.Timeout <= 4 {
+	if c.UDPRelay.Timeout != 0 && c.UDPRelay.Timeout < 4 {
 		return errors.New("invalid UDP relay timeout")
 	}
 	for _, r := range c.TCPRelays {
@@ -273,13 +273,13 @@ func (c *clientConfig) Check() error {
 			return err
 		}
 	}
-	if c.TCPTProxy.Timeout != 0 && c.TCPTProxy.Timeout <= 4 {
+	if c.TCPTProxy.Timeout != 0 && c.TCPTProxy.Timeout < 4 {
 		return errors.New("invalid TCP TProxy timeout")
 	}
-	if c.UDPTProxy.Timeout != 0 && c.UDPTProxy.Timeout <= 4 {
+	if c.UDPTProxy.Timeout != 0 && c.UDPTProxy.Timeout < 4 {
 		return errors.New("invalid UDP TProxy timeout")
 	}
-	if c.TCPRedirect.Timeout != 0 && c.TCPRedirect.Timeout <= 4 {
+	if c.TCPRedirect.Timeout != 0 && c.TCPRedirect.Timeout < 4 {
 		return errors.New("invalid TCP Redirect timeout")
 	}
 	if len(c.Server) == 0 {