diff --git a/pkg/liberrors/server.go b/pkg/liberrors/server.go
index 865e5b6d..f79cc708 100644
--- a/pkg/liberrors/server.go
+++ b/pkg/liberrors/server.go
@@ -242,7 +242,7 @@ type ErrServerUDPPortsAlreadyInUse struct {
 
 // Error implements the error interface.
 func (e ErrServerUDPPortsAlreadyInUse) Error() string {
-	return fmt.Sprintf("UDP ports %d and %d are already assigned to another reader",
+	return fmt.Sprintf("UDP ports %d and %d are already assigned to another reader with the same IP",
 		e.Port, e.Port+1)
 }
 
diff --git a/server_read_test.go b/server_read_test.go
index 1bfe1b3e..b470cfea 100644
--- a/server_read_test.go
+++ b/server_read_test.go
@@ -280,7 +280,7 @@ func TestServerReadSetupErrors(t *testing.T) {
 	}
 }
 
-func TestServerReadSetupErrorSameUDPPorts(t *testing.T) {
+func TestServerReadSetupErrorSameUDPPortsAndIP(t *testing.T) {
 	track := &TrackH264{
 		PayloadType: 96,
 		SPS:         []byte{0x01, 0x02, 0x03, 0x04},
@@ -295,7 +295,8 @@ func TestServerReadSetupErrorSameUDPPorts(t *testing.T) {
 		Handler: &testServerHandler{
 			onConnClose: func(ctx *ServerHandlerOnConnCloseCtx) {
 				if atomic.SwapInt32(&first, 0) == 1 {
-					require.EqualError(t, ctx.Error, "UDP ports 35466 and 35467 are already assigned to another reader")
+					require.EqualError(t, ctx.Error,
+						"UDP ports 35466 and 35467 are already assigned to another reader with the same IP")
 				}
 			},
 			onSetup: func(ctx *ServerHandlerOnSetupCtx) (*base.Response, *ServerStream, error) {
diff --git a/serverstream.go b/serverstream.go
index 1a9699aa..08556d15 100644
--- a/serverstream.go
+++ b/serverstream.go
@@ -145,7 +145,7 @@ func (st *ServerStream) readerAdd(
 
 	switch transport {
 	case TransportUDP:
-		// check whether UDP ports are already assigned to another reader
+		// check whether UDP ports and IP are already assigned to another reader
 		for r := range st.readers {
 			if *r.setuppedTransport == TransportUDP &&
 				r.author.ip().Equal(ss.author.ip()) &&