When getting this error through Visual Studio it was because there was a signing certificate setup to match the computer it was originally developed on. You can check this by going to the project properties > signing tab and checking the certificate details. You can uncheck “Sign the ClickOnce manifests” to disable signing. If you … Read more
I finally found the answer (I haven’t noted my source but it was from a search); While the code works in Windows XP, in Windows 7, you must add this at the beginning: // using System.Net; ServicePointManager.Expect100Continue = true; ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12; // Use SecurityProtocolType.Ssl3 if needed for compatibility reasons And now, it works perfectly. … Read more
In Windows 8, Windows 10, and Windows 11, you have to right-click devenv.exe and select “Troubleshoot compatibility”. Select “Troubleshoot program” Check “The program requires additional permissions” Click “Next” Click “Test the program…” Wait for the program to launch Click “Next” Select “Yes, save these settings for this program” Click “Close” If, when you open Visual … Read more