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QGS and WinHTTP 12175/12152/HTTP 500 

If customers utilize the Qualys Gateway Service (QGS) for agent communication, WinHTTP 12175, 12152 can be logged in the following two scenarios:

In both scenarios,  the following entries can be found in the Cloud Agent log file:

Error: CORE: Unable to communicate with the server. (winhttp code: 12152), The server response cannot be parsed. 

Solution

Check the following solutions: 

Note: Use the HTTP prefix for an encrypted connection while configuring the proxy for the Windows agent because to forward HTTPS/TLS encrypted sessions over a tunneled TCP session, Windows Agents use the HTTP CONNECT method. TCP communication through this initial connection is encrypted. For details, refer to HTTP CONNECT Method.

Related Links

- Qualys Gateway Services User Guide 

- Cloud Agent for Windows Installation Guide