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Editorial Team
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Asked: 2026-06-01T15:14:10+00:00

I have a Qt application that I’m deploying with Qt 4.8.1 under Windows 7

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I have a Qt application that I’m deploying with Qt 4.8.1 under Windows 7 x64 SP1, but compiled with 32 bit. The application uses QNetworkAccessManager, QNetworkRequest, and QNetworkReply to communicate over HTTPS to a server. I have successfully tested this connection on five different machines. On the sixth machine I went to test this on the connection failed with a QNetworkReply::NetworkError UnknownNetworkError. This machine can go to the URL in a web browser and that communication works fine. Additionally I was able to use a different computer on the same network and successfully make the connection with my application. Does anyone have any ideas what could be causing this behavior? Also, I saw this behavior with Qt version 4.7.4 as well as 4.8.1.

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1 Answer

  1. Editorial Team

    It was an SSL problem. Apparently Qt requires the OpenSSL dlls. Once I included those everything worked fine.

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