diff --git a/bin/usb-client b/bin/usb-client
index 97f7cb4..acdfd0c 100755
Binary files a/bin/usb-client and b/bin/usb-client differ
diff --git a/bin/usb-relay b/bin/usb-relay
index 61279f8..fc31968 100755
Binary files a/bin/usb-relay and b/bin/usb-relay differ
diff --git a/internal/usbip/server.go b/internal/usbip/server.go
index 090055d..449c82b 100644
--- a/internal/usbip/server.go
+++ b/internal/usbip/server.go
@@ -336,6 +336,26 @@ func (s *Server) handleCmdSubmit(r io.Reader, hdr *URBHeader, retChan chan<- []b
 	endpoint := uint8(hdr.Endpoint)
 	urbType := s.getURBType(endpoint)
 
+	dirStr := "OUT"
+	if hdr.Direction == DirIn {
+		dirStr = "IN"
+	}
+
+	// Log all transfers for debugging
+	if endpoint == 0 {
+		bmReqType := body.Setup[0]
+		bReq := body.Setup[1]
+		wVal := binary.LittleEndian.Uint16(body.Setup[2:4])
+		wIdx := binary.LittleEndian.Uint16(body.Setup[4:6])
+		wLen := binary.LittleEndian.Uint16(body.Setup[6:8])
+		log.Printf("[usbip-server] CTRL %s seq=%d bmReqType=0x%02x bReq=0x%02x wVal=0x%04x wIdx=0x%04x wLen=%d bufLen=%d",
+			dirStr, hdr.SeqNum, bmReqType, bReq, wVal, wIdx, wLen, body.TransferBufferLen)
+	} else {
+		typeNames := map[uint8]string{0: "ISO", 1: "INT", 2: "CTRL", 3: "BULK"}
+		log.Printf("[usbip-server] EP%d %s seq=%d type=%s bufLen=%d numPkts=%d",
+			endpoint, dirStr, hdr.SeqNum, typeNames[urbType], body.TransferBufferLen, numPackets)
+	}
+
 	// Handle control transfers specially (endpoint 0)
 	if endpoint == 0 && hdr.Direction == DirIn {
 		buf := make([]byte, body.TransferBufferLen)
@@ -348,6 +368,7 @@ func (s *Server) handleCmdSubmit(r io.Reader, hdr *URBHeader, retChan chan<- []b
 		)
 		var status int32
 		if err != nil {
+			log.Printf("[usbip-server] CTRL IN failed: %v", err)
 			status = -32 // -EPIPE
 			n = 0
 		}
@@ -441,6 +462,7 @@ func (s *Server) handleCmdSubmit(r io.Reader, hdr *URBHeader, retChan chan<- []b
 		UserContext:  uintptr(hdr.SeqNum),
 	})
 	if err != nil {
+		log.Printf("[usbip-server] SubmitURB(ep=0x%02x, type=%d, len=%d) FAILED: %v", ep, urbType, len(buf), err)
 		resp, _ := BuildRetSubmit(hdr.SeqNum, hdr.DevID, hdr.Direction, hdr.Endpoint, -32, nil)
 		retChan <- resp
 		return nil
@@ -494,6 +516,9 @@ func (s *Server) handleISOSubmit(hdr *URBHeader, body *CmdSubmitBody, transferBu
 	}
 
 	// Submit ISO URB
+	log.Printf("[usbip-server] ISO submit: ep=0x%02x dir=%d pkts=%d totalBuf=%d",
+		ep, hdr.Direction, numPackets, totalBufLen)
+
 	urb, isoMem, err := s.handle.SubmitISOURB(&usb.SubmitISOURBParams{
 		Endpoint:        ep,
 		Flags:           0x02, // URB_ISO_ASAP
@@ -503,6 +528,7 @@ func (s *Server) handleISOSubmit(hdr *URBHeader, body *CmdSubmitBody, transferBu
 		UserContext:      uintptr(hdr.SeqNum),
 	})
 	if err != nil {
+		log.Printf("[usbip-server] ISO submit FAILED: %v", err)
 		// Submit failed - send error response
 		resp, _ := BuildRetSubmit(hdr.SeqNum, hdr.DevID, hdr.Direction, hdr.Endpoint, -32, nil)
 		retChan <- resp
@@ -601,6 +627,11 @@ func (s *Server) reapLoop(retChan chan<- []byte, done <-chan struct{}) {
 			continue
 		}
 
+		if urbInfo.Status != 0 {
+			log.Printf("[usbip-server] URB completed: seq=%d ep=%d status=%d actual=%d iso=%v",
+				pending.seqNum, pending.endpoint, urbInfo.Status, urbInfo.ActualLength, pending.isISO)
+		}
+
 		var resp []byte
 		if pending.isISO {
 			resp, err = s.buildISOResponse(urbInfo, pending)