diff --git a/common/mux/server.go b/common/mux/server.go
index b3c22a61..55e3a674 100644
--- a/common/mux/server.go
+++ b/common/mux/server.go
@@ -2,7 +2,6 @@ package mux
 
 import (
 	"context"
-	"fmt"
 	"io"
 
 	"github.com/xtls/xray-core/common"
@@ -12,7 +11,6 @@ import (
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/protocol"
 	"github.com/xtls/xray-core/common/session"
-	"github.com/xtls/xray-core/common/xudp"
 	"github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/features/routing"
 	"github.com/xtls/xray-core/transport"
@@ -148,9 +146,7 @@ func (w *ServerWorker) handleStatusNew(ctx context.Context, meta *FrameMetadata,
 		} else {
 			if x.Status == Initializing { // nearly impossible
 				XUDPManager.Unlock()
-				if xudp.Show {
-					fmt.Printf("XUDP hit: %v err: conflict\n", meta.GlobalID)
-				}
+				newError("XUDP hit ", meta.GlobalID).Base(errors.New("conflict")).AtWarning().WriteToLog(session.ExportIDToError(ctx))
 				// It's not a good idea to return an err here, so just let client wait.
 				// Client will receive an End frame after sending a Keep frame.
 				return nil
@@ -168,9 +164,7 @@ func (w *ServerWorker) handleStatusNew(ctx context.Context, meta *FrameMetadata,
 				b.Release()
 				mb = nil
 			}
-			if xudp.Show {
-				fmt.Printf("XUDP hit: %v err: %v\n", meta.GlobalID, err)
-			}
+			newError("XUDP hit ", meta.GlobalID).Base(err).WriteToLog(session.ExportIDToError(ctx))
 		}
 		if mb != nil {
 			ctx = session.ContextWithTimeoutOnly(ctx, true)
@@ -180,10 +174,7 @@ func (w *ServerWorker) handleStatusNew(ctx context.Context, meta *FrameMetadata,
 				XUDPManager.Lock()
 				delete(XUDPManager.Map, x.GlobalID)
 				XUDPManager.Unlock()
-				err = newError("failed to dispatch request to ", meta.Target).Base(err)
-				if xudp.Show {
-					fmt.Printf("XUDP new: %v err: %v\n", meta.GlobalID, err)
-				}
+				err = newError("XUDP new ", meta.GlobalID).Base(errors.New("failed to dispatch request to ", meta.Target).Base(err))
 				return err // it will break the whole Mux connection
 			}
 			link.Writer.WriteMultiBuffer(mb) // it's meaningless to test a new pipe
@@ -191,9 +182,7 @@ func (w *ServerWorker) handleStatusNew(ctx context.Context, meta *FrameMetadata,
 				input:  link.Reader,
 				output: link.Writer,
 			}
-			if xudp.Show {
-				fmt.Printf("XUDP new: %v err: %v\n", meta.GlobalID, err)
-			}
+			newError("XUDP new ", meta.GlobalID).Base(err).WriteToLog(session.ExportIDToError(ctx))
 		}
 		x.Mux = &Session{
 			input:        x.Mux.input,
diff --git a/common/mux/session.go b/common/mux/session.go
index 650e3545..69597440 100644
--- a/common/mux/session.go
+++ b/common/mux/session.go
@@ -1,7 +1,6 @@
 package mux
 
 import (
-	"fmt"
 	"io"
 	"runtime"
 	"sync"
@@ -11,7 +10,6 @@ import (
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/protocol"
-	"github.com/xtls/xray-core/common/xudp"
 	"github.com/xtls/xray-core/transport/pipe"
 )
 
@@ -182,9 +180,7 @@ func (s *Session) Close(locked bool) error {
 		if s.XUDP.Status == Active {
 			s.XUDP.Expire = time.Now().Add(time.Minute)
 			s.XUDP.Status = Expiring
-			if xudp.Show {
-				fmt.Printf("XUDP put: %v\n", s.XUDP.GlobalID)
-			}
+			newError("XUDP put ", s.XUDP.GlobalID).AtDebug().WriteToLog()
 		}
 		XUDPManager.Unlock()
 	}
@@ -234,9 +230,7 @@ func init() {
 				if x.Status == Expiring && now.After(x.Expire) {
 					x.Interrupt()
 					delete(XUDPManager.Map, id)
-					if xudp.Show {
-						fmt.Printf("XUDP del: %v\n", id)
-					}
+					newError("XUDP del ", id).AtDebug().WriteToLog()
 				}
 			}
 			XUDPManager.Unlock()
diff --git a/proxy/freedom/freedom.go b/proxy/freedom/freedom.go
index 8630ab9c..93804a81 100644
--- a/proxy/freedom/freedom.go
+++ b/proxy/freedom/freedom.go
@@ -117,7 +117,6 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 			UDPOverride.Port = destination.Port
 		}
 	}
-	newError("opening connection to ", destination).WriteToLog(session.ExportIDToError(ctx))
 
 	input := link.Reader
 	output := link.Writer
@@ -148,6 +147,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 		return newError("failed to open connection to ", destination).Base(err)
 	}
 	defer conn.Close()
+	newError("connection opened to ", destination, ", local endpoint ", conn.LocalAddr(), ", remote endpoint ", conn.RemoteAddr()).WriteToLog(session.ExportIDToError(ctx))
 
 	var newCtx context.Context
 	var newCancel context.CancelFunc