由于以下错误消息,我们无法使用WebRequest连接到HTTPS服务器:

请求被中止:无法创建SSL/TLS安全通道。

我们知道服务器没有有效的HTTPS证书,但为了绕过这个问题,我们使用下面的代码,我们从另一个StackOverflow帖子:

private void Somewhere() {
    ServicePointManager.ServerCertificateValidationCallback += new RemoteCertificateValidationCallback(AlwaysGoodCertificate);
}

private static bool AlwaysGoodCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors policyErrors) {
   return true;
}

问题是服务器从未验证证书,并出现上述错误而失败。有人知道我该怎么做吗?


我应该提到的是,我和一个同事几周前进行了测试,它运行得很好,与我上面写的类似。我们发现的唯一“主要区别”是,我用的是Windows 7,而他用的是Windows XP。这会改变什么吗?


当前回答

我有这个问题是因为我的网。配置:

<httpRuntime targetFramework="4.5.2" />

而不是:

<httpRuntime targetFramework="4.6.1" />

其他回答

对我来说,这只是发生在一个网站上,结果是它只有RC4密码可用。在之前加强服务器的努力中,我禁用了RC4密码,一旦我重新启用这个问题就解决了。

After days of pulling what hair I have left out, we solved the problem. I tried everything suggested on this post and nothing worked for me. For us, we had a basic .Net Framework 4.8 console app running on a customers Windows VM. The on-premise server we were communicating with required that SSL Certificate Validation was turned off. One of our guys discovered that the server required we were using TLS 1.0 and on the registry settings of the VM, TLS 1.0 was disabled. Once we enabled that, it worked. I also needed to added the following two lines as mentioned many times above:

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };

如果你不想,不容易,或者不能快速地给你的代码打补丁,相反,你可以在框架中强制你的. net代码使用TLS 1.2。

这不是我的应用程序,但它帮助修复了我们的旧的。net 4.5应用程序(在Server 2008r2上运行),再次与Paypal Payflow Gateway一起工作。他们一定是在6/25/18和7/8/18之间开始在资金流网关回调上强制连接到TLS 1.2。

详细信息:https://github.com/TheLevelUp/pos-tls-patcher。 下载:https://github.com/TheLevelUp/pos-tls-patcher/releases。

在。net 4.5中,这个问题的解决方案是

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

如果你没有。net 4.5,那就使用

ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;

另一种可能是箱子上的证书输入不当。请确保选中周围的复选框。最初我没有这样做,所以代码要么超时,要么抛出相同的异常,因为私钥无法定位。