diff --git a/ntlm/ntlmv2.go b/ntlm/ntlmv2.go
index 29c73a4..efadeea 100644
--- a/ntlm/ntlmv2.go
+++ b/ntlm/ntlmv2.go
@@ -246,14 +246,16 @@ func (n *V2ServerSession) ProcessAuthenticateMessage(am *AuthenticateMessage) (e
 		return err
 	}
 
-	hexServerChallenge := hex.EncodeToString(n.serverChallenge)
+	hexServerChallenge := hex.EncodeToString(n.challengeMessage.ServerChallenge)
+	hexNTLMClienteChallenge := hex.EncodeToString(n.ntChallengeResponse)
 	hexClientChallenge := hex.EncodeToString(n.clientChallenge)
 
-	log.Printf("DEBUG: challenge Server: %v\n", hexServerChallenge)
-	log.Printf("DEBUG: ntChallengeResponse: %v\n", hexClientChallenge)
+	log.Printf("DEBUG: challenge Server: %s\n", hexServerChallenge)
+	log.Printf("DEBUG: ntChallengeResponse: %s\n", hexNTLMClienteChallenge)
+	log.Printf("DEBUG: ClientChallenge: %s\n", hexClientChallenge)
 
 	// Execute ntlm_auth to check user auth
-	cmd := exec.Command("/usr/local/bin/ntlm_auth", "--domain="+n.userDomain, "--username="+n.user, "--challenge="+hexServerChallenge, "--nt-response="+hexClientChallenge)
+	cmd := exec.Command("/usr/local/bin/ntlm_auth", "--domain="+n.userDomain, "--username="+n.user, "--challenge="+hexServerChallenge, "--nt-response="+(hexNTLMClienteChallenge+hexClientChallenge))
 	output, err := cmd.CombinedOutput()
 	if err != nil {
 		fmt.Printf("Failed to execute command: %s\n", err)