The issue arises because Istio AuthorizationPolicy can control access based on HTTP-specific attributes such as paths, methods, or headers. Since the problem is specific to certain URLs (paths) failing while others succeed, it indicates that the AuthorizationPolicy is configured to block requests to those specific paths. Kubernetes NetworkPolicy (A) operates at the network layer (L3/L4) and cannot filter based on HTTP paths. Incorrect TCP ports (B) would block all traffic to that port, not specific URLs. mTLS in permissive mode (D) allows both encrypted and plaintext traffic, so it would not selectively block URLs.