使用 wireshark 对 .NET 4.7.2 / 4.8 中的 TLS1.2 进行故障排除

Question

我们在开发 PC (win10) 上运行良好的 .NET 应用程序有问题但是当部署到“Windows server 2016”生产环境时，它报告：

System.Net.WebException: The request was aborted: Could not create SSL/TLS secure channel.

开发环境和生产环境中的 wireshark 差异在 Dev (Win10) 上，“Server Key Exchange”数据包后有“Certificate,Client Key Exchange”

在 Prod (srv 2016) 上，在“服务器密钥交换”之后有“TCP 虚假重传”，如屏幕截图所示

尝试使用 .NET 4.7.2 和 4.8 同样的错误，如何进行？使用 PFX 证书时生产服务器似乎出现问题

Dim request As HttpWebRequest = CType(WebRequest.Create("https://obt2b1.service.com/cords/api/"), HttpWebRequest)
request.Method = WebRequestMethods.Http.Post
request.Accept = "application/xml"
request.ContentType = "application/xml"
'Use x509 PFX
request.ClientCertificates.Add(getCert())
request.KeepAlive = True
request.CachePolicy = New System.Net.Cache.RequestCachePolicy(System.Net.Cache.RequestCacheLevel.NoCacheNoStore)
request.Timeout = 1000000
request.AllowAutoRedirect = True

Dim dataStream As Byte() = Encoding.UTF8.GetBytes(xml_send)
request.ContentLength = dataStream.Length

ServicePointManager.Expect100Continue = true
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12

'Here the error "System.Net.WebException: The request was aborted: Could not create SSL/TLS secure channel." is reported
Dim _stream As Stream = request.GetRequestStream()

...

Private Function getCert() As X509Certificate2
    Dim collection As New X509Certificate2Collection()
    collection.Import("C:\pfx\test.pfx", "xxx", X509KeyStorageFlags.PersistKeySet Or X509KeyStorageFlags.UserKeySet Or X509KeyStorageFlags.MachineKeySet Or X509KeyStorageFlags.Exportable)
    Return collection(0)
End Function

已编辑 ... SecurityProtocol 向上移动了同样的东西

ServicePointManager.Expect100Continue = true
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12
Dim request As HttpWebRequest = CType(WebRequest.Create("https://obt2b1.service.com/cords/api/"), HttpWebRequest)
request.Method = WebRequestMethods.Http.Post
request.Accept = "application/xml"
request.ContentType = "application/xml"
'Use x509 PFX
request.ClientCertificates.Add(getCert())
request.KeepAlive = True
request.CachePolicy = New System.Net.Cache.RequestCachePolicy(System.Net.Cache.RequestCacheLevel.NoCacheNoStore)
request.Timeout = 1000000
request.AllowAutoRedirect = True

Dim dataStream As Byte() = Encoding.UTF8.GetBytes(xml_send)
request.ContentLength = dataStream.Length

'GetRequestStream() gets the error "System.Net.WebException: The request was aborted: Could not create SSL/TLS secure channel." is reported
Dim _stream As Stream = request.GetRequestStream()

Answer 1

好的，经过将近一周的测试，我找到了解决方案。我尝试过的事情：

windows 服务器 2012R2（工作没问题）
windows 服务器 2016（不工作）
windows 服务器 2019（不工作）

我尝试在 IIS Cryto 3.2 中启用所有密码和所有设置 - 没有帮助。问题出在 IIS 的工作进程中，您需要将“加载用户配置文件”启用为 True

IIS -> 应用程序池 ->（选择池） -> 高级设置 ... 将“加载用户配置文件”从 false 更改为 true ...

之后我开始 IIS Crypto 3.2 像以前一样将所有设置设置为限制

使用 wireshark 对 .NET 4.7.2 / 4.8 中的 TLS1.2 进行故障排除

Troubleshoot TLS1.2 in .NET 4.7.2 / 4.8 with wireshark

vb.net

wireshark

tls1.2