XmlReader.Create错误“无法创建SSL / TLS安全通道”(XmlReader.Create error “Could not create SSL/TLS secure channel”)

 在我的基于ASP.net的网站上，我从几个网站汇总了我的活动源。 其中一个是https://github.com/lucamauri.atom上的GitHub feed：这是一个有效的提要，可以通过网络浏览器正确读取，并且自从几周前在我的网站上正常工作。 从那以后，它开始产生错误 
 
 在代码中，我首先创建和XMLReader ，然后将其加载到SyndicationFeed对象中，如下所示： 
 
Dim TempReader As System.Xml.XmlReader = System.Xml.XmlReader.Create(TempString)
Dim SyndFeed As SyndicationFeed = SyndicationFeed.Load(TempReader)
Dim TempItems As New List(Of SyndicationItem)
TempItems.AddRange(SyndFeed.Items.ToList.GetRange(0, Math.Min(CurrentFeed.TotalElements, SyndFeed.Items.Count)))
 
 这适用于多个提要，但是GitHub现在在上面的代码的第一行生成TLS错误： 
 
 
 
 System.Net.WebException：请求已中止：无法创建SSL / TLS安全通道。 
 在System.Xml.XmlDownloadManager.GetNonFileStream上的System.Net.HttpWebRequest.GetResponse（）（Uri uri，ICredentials凭据，IWebProxy代理，RequestCachePolicy cachePolicy） 
 在System.Xml.XmlDownloadManager.GetStream（Uri uri，ICredentials凭据，IWebProxy代理，RequestCachePolicy cachePolicy） 
 在System.Xml.XmlUrlResolver.GetEntity（Uri absoluteUri，字符串角色，类型的ObjectToReturn） 
 在System.Xml.XmlTextReaderImpl..ctor（String uriStr，XmlReaderSettings设置，XmlParserContext上下文，XmlResolver uriResolver）System.Xml.XmlTextReaderImpl.FinishInitUriString（） 
 在System.Xml.XmlReaderSettings.CreateReader（String inputUri，XmlParserContext inputContext） 
 在System.Xml.XmlReader.Create（String inputUri，XmlReaderSettings设置，XmlParserContext inputContext） 
 在System.Xml.XmlReader.Create（String inputUri） 
 
 
 我使用与其他HTTPS提要相同的代码（ https://stackoverflow.com/feeds/user/69295只是为了命名一个），我不会收到错误。 所以这是GitHub提要特有的东西，但是我可以在运行网站的同一台机器上通过浏览器访问它，所以我迷失了方向。 
 
 关于问题原因的任何想法？ 

On my ASP.net-based website I am aggregating feeds of my activities from several website. One of those is the GitHub feed at https://github.com/lucamauri.atom: this is a valid feed correctly readable using a web browser and it properly worked on my website since a couple of weeks ago. Since then, it started generating errors
 
In the code I first create and XMLReader and then I load it in a SyndicationFeed object as follows:
 
Dim TempReader As System.Xml.XmlReader = System.Xml.XmlReader.Create(TempString)
Dim SyndFeed As SyndicationFeed = SyndicationFeed.Load(TempReader)
Dim TempItems As New List(Of SyndicationItem)
TempItems.AddRange(SyndFeed.Items.ToList.GetRange(0, Math.Min(CurrentFeed.TotalElements, SyndFeed.Items.Count)))
 
This works properly with several feeds, but the GitHub one now generate a TLS error on the first row of the above code:
 
 
 
System.Net.WebException: The request was aborted: Could not create SSL/TLS secure channel.
 at System.Net.HttpWebRequest.GetResponse() at System.Xml.XmlDownloadManager.GetNonFileStream(Uri uri, ICredentials credentials, IWebProxy proxy, RequestCachePolicy cachePolicy)
 at System.Xml.XmlDownloadManager.GetStream(Uri uri, ICredentials credentials, IWebProxy proxy, RequestCachePolicy cachePolicy)
 at System.Xml.XmlUrlResolver.GetEntity(Uri absoluteUri, String role, Type ofObjectToReturn)
 at System.Xml.XmlTextReaderImpl.FinishInitUriString() at System.Xml.XmlTextReaderImpl..ctor(String uriStr, XmlReaderSettings settings, XmlParserContext context, XmlResolver uriResolver)
 at System.Xml.XmlReaderSettings.CreateReader(String inputUri, XmlParserContext inputContext)
 at System.Xml.XmlReader.Create(String inputUri, XmlReaderSettings settings, XmlParserContext inputContext)
 at System.Xml.XmlReader.Create(String inputUri)
 
 
I use the same code with other HTTPS feeds (https://stackoverflow.com/feeds/user/69295 just to name one) and I do not get the error. So this is something specific to the GitHub feed, but then again I can reach it from a browser on the same machine where I run the website, so I am lost at it.
 
Any idea on the cause of the issue?

原文：https://stackoverflow.com/questions/49093794