WinHttpAutoProxySvc, которая по умолчанию запускается вручную.
Вот ее описание:
Implements the Web Proxy Auto-Discovery (WPAD) protocol for Windows HTTP Services (WinHTTP). WPAD is a protocol to enable an HTTP client to automatically discover a proxy configuration. If this service is stopped or disabled, the WPAD protocol will be executed within the HTTP client's process instead of an external service process; there would be no loss of functionality as a result.
