diff --git a/src/core/link_socks.go b/src/core/link_socks.go
index ad5b8c9..036de99 100644
--- a/src/core/link_socks.go
+++ b/src/core/link_socks.go
@@ -23,7 +23,7 @@ func (l *links) newLinkSOCKS() *linkSOCKS {
 func (l *linkSOCKS) dial(url *url.URL, options linkOptions) error {
 	info := linkInfoFor("socks", "", url.Path)
 	if l.links.isConnectedTo(info) {
-		return fmt.Errorf("duplicate connection attempt")
+		return nil
 	}
 	proxyAuth := &proxy.Auth{}
 	proxyAuth.User = url.User.Username()
diff --git a/src/core/link_tcp.go b/src/core/link_tcp.go
index 3074998..6a04bb3 100644
--- a/src/core/link_tcp.go
+++ b/src/core/link_tcp.go
@@ -33,7 +33,7 @@ func (l *links) newLinkTCP() *linkTCP {
 func (l *linkTCP) dial(url *url.URL, options linkOptions, sintf string) error {
 	info := linkInfoFor("tcp", sintf, strings.SplitN(url.Host, "%", 2)[0])
 	if l.links.isConnectedTo(info) {
-		return fmt.Errorf("duplicate connection attempt")
+		return nil
 	}
 	addr, err := net.ResolveTCPAddr("tcp", url.Host)
 	if err != nil {
diff --git a/src/core/link_tls.go b/src/core/link_tls.go
index 2dc2daf..bc39b6c 100644
--- a/src/core/link_tls.go
+++ b/src/core/link_tls.go
@@ -49,7 +49,7 @@ func (l *links) newLinkTLS(tcp *linkTCP) *linkTLS {
 func (l *linkTLS) dial(url *url.URL, options linkOptions, sintf, sni string) error {
 	info := linkInfoFor("tls", sintf, strings.SplitN(url.Host, "%", 2)[0])
 	if l.links.isConnectedTo(info) {
-		return fmt.Errorf("duplicate connection attempt")
+		return nil
 	}
 	addr, err := net.ResolveTCPAddr("tcp", url.Host)
 	if err != nil {
diff --git a/src/core/link_unix.go b/src/core/link_unix.go
index e71f936..2d1b939 100644
--- a/src/core/link_unix.go
+++ b/src/core/link_unix.go
@@ -2,7 +2,6 @@ package core
 
 import (
 	"context"
-	"fmt"
 	"net"
 	"net/url"
 	"time"
@@ -36,7 +35,7 @@ func (l *links) newLinkUNIX() *linkUNIX {
 func (l *linkUNIX) dial(url *url.URL, options linkOptions, _ string) error {
 	info := linkInfoFor("unix", "", url.Path)
 	if l.links.isConnectedTo(info) {
-		return fmt.Errorf("duplicate connection attempt")
+		return nil
 	}
 	addr, err := net.ResolveUnixAddr("unix", url.Path)
 	if err != nil {