diff --git a/crates/liburlx/src/easy.rs b/crates/liburlx/src/easy.rs
index 3324850..cc3ad59 100644
--- a/crates/liburlx/src/easy.rs
+++ b/crates/liburlx/src/easy.rs
@@ -3480,7 +3480,7 @@ async fn perform_transfer(
         // For NTLM, send Content-Length: 0 (body will be sent after Type3).
         let is_challenge_response = !has_digest_state
             && auth_credentials.as_ref().is_some_and(|a| matches!(a.method, AuthMethod::Digest));
-        let is_ntlm_probe =
+        let mut is_ntlm_probe =
             auth_credentials.as_ref().is_some_and(|a| matches!(a.method, AuthMethod::Ntlm));
         let initial_body = if is_challenge_response || is_ntlm_probe {
             if current_body.is_some() {
@@ -4229,6 +4229,11 @@ async fn perform_transfer(
                                         fail_on_error,
                                     ))
                                     .await?;
+
+                                    // NTLM Type 3 auth complete — reset probe flag so the
+                                    // probe-retry logic (line ~3638) does not re-send the
+                                    // request on the already-successful 200 response.
+                                    is_ntlm_probe = false;
                                 }
                             }
                         }