diff --git a/pkg/network/server.go b/pkg/network/server.go
index ccf876587..fb3732505 100644
--- a/pkg/network/server.go
+++ b/pkg/network/server.go
@@ -23,7 +23,6 @@ const (
 )
 
 var (
-	errPortMismatch     = errors.New("port mismatch")
 	errIdenticalID      = errors.New("identical node id")
 	errInvalidHandshake = errors.New("invalid handshake")
 	errInvalidNetwork   = errors.New("invalid network")
@@ -248,7 +247,7 @@ func (s *Server) handleVersionCmd(p Peer, version *payload.Version) error {
 		return errIdenticalID
 	}
 	if p.NetAddr().Port != int(version.Port) {
-		return errPortMismatch
+		return fmt.Errorf("port mismatch: connected to %d and peer sends %d", p.NetAddr().Port, version.Port)
 	}
 	return p.SendVersionAck(NewMessage(s.Net, CMDVerack, nil))
 }
diff --git a/pkg/network/server_test.go b/pkg/network/server_test.go
index 0d4e1238b..7d96b7989 100644
--- a/pkg/network/server_test.go
+++ b/pkg/network/server_test.go
@@ -71,7 +71,7 @@ func TestServerNotSendsVerack(t *testing.T) {
 	version := payload.NewVersion(1337, 2000, "/NEO-GO/", 0, true)
 	err := s.handleVersionCmd(p, version)
 	assert.NotNil(t, err)
-	assert.Equal(t, errPortMismatch, err)
+	assert.Contains(t, err.Error(), "port mismatch")
 
 	// identical id's
 	version = payload.NewVersion(1, 3000, "/NEO-GO/", 0, true)