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    <title>topic Re: Could not create ssl tls secure channel .net library api in Discuss Dropbox Developer &amp; API</title>
    <link>https://www.dropboxforum.com/t5/Discuss-Dropbox-Developer-API/Could-not-create-ssl-tls-secure-channel-net-library-api/m-p/592657#M2539</link>
    <description>&lt;P&gt;I've encountered the same issue as you. I managed to fix it by adding the following lines of code&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&lt;BR /&gt;ServicePointManager.Expect100Continue = true;&lt;BR /&gt;ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;before calling the dropbox functions, e.g. in the Main() function of the application.&lt;/P&gt;</description>
    <pubDate>Fri, 22 Apr 2022 09:55:13 GMT</pubDate>
    <dc:creator>SHommersom</dc:creator>
    <dc:date>2022-04-22T09:55:13Z</dc:date>
    <item>
      <title>Could not create ssl tls secure channel .net library api</title>
      <link>https://www.dropboxforum.com/t5/Discuss-Dropbox-Developer-API/Could-not-create-ssl-tls-secure-channel-net-library-api/m-p/398102#M1034</link>
      <description>&lt;P&gt;Hello my friends&lt;BR /&gt;I write simple winform application for download files from my account dropbox .&lt;BR /&gt;After few hour exception is raised :&lt;BR /&gt;Could not create ssl/tls secure channel .&lt;BR /&gt;I test on vps server in germany&lt;/P&gt;</description>
      <pubDate>Mon, 24 Feb 2020 07:08:57 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Discuss-Dropbox-Developer-API/Could-not-create-ssl-tls-secure-channel-net-library-api/m-p/398102#M1034</guid>
      <dc:creator>adelhoss</dc:creator>
      <dc:date>2020-02-24T07:08:57Z</dc:date>
    </item>
    <item>
      <title>Re: Could not create ssl tls secure channel .net library api</title>
      <link>https://www.dropboxforum.com/t5/Discuss-Dropbox-Developer-API/Could-not-create-ssl-tls-secure-channel-net-library-api/m-p/398229#M1036</link>
      <description>&lt;P&gt;The&amp;nbsp;Dropbox API servers are being served with valid SSL/TLS configurations, and I'm not aware of any current service disruptions that may cause this. It sounds like there may an issue with your network connection or system. Here are some threads that may be helpful:&lt;/P&gt;
&lt;UL&gt;
&lt;LI&gt;&lt;A href="https://www.dropboxforum.com/t5/API-Support-Feedback/Getting-error-The-request-was-aborted-Could-not-create-SSL-TLS/m-p/336161#M19585" target="_self"&gt;https://www.dropboxforum.com/t5/API-Support-Feedback/Getting-error-The-request-was-aborted-Could-not-create-SSL-TLS/m-p/336161#M19585&lt;/A&gt;&lt;/LI&gt;
&lt;LI&gt;&lt;A href="https://social.msdn.microsoft.com/Forums/en-US/f60a7792-bb63-4c86-9806-f9565e5d2915/httprequestexception-the-request-was-aborted-could-not-create-ssltls-secure-channel?forum=winappswithcsharp" target="_self"&gt;https://social.msdn.microsoft.com/Forums/en-US/f60a7792-bb63-4c86-9806-f9565e5d2915/httprequestexception-the-request-was-aborted-could-not-create-ssltls-secure-channel?forum=winappswithcsharp&lt;/A&gt;&lt;/LI&gt;
&lt;/UL&gt;</description>
      <pubDate>Thu, 20 Feb 2020 16:32:13 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Discuss-Dropbox-Developer-API/Could-not-create-ssl-tls-secure-channel-net-library-api/m-p/398229#M1036</guid>
      <dc:creator>Greg-DB</dc:creator>
      <dc:date>2020-02-20T16:32:13Z</dc:date>
    </item>
    <item>
      <title>Re: Could not create ssl tls secure channel .net library api</title>
      <link>https://www.dropboxforum.com/t5/Discuss-Dropbox-Developer-API/Could-not-create-ssl-tls-secure-channel-net-library-api/m-p/398362#M1040</link>
      <description>After 12 hour activity show this exception ....&lt;BR /&gt;Problem in your library ....&lt;BR /&gt;</description>
      <pubDate>Fri, 21 Feb 2020 06:10:17 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Discuss-Dropbox-Developer-API/Could-not-create-ssl-tls-secure-channel-net-library-api/m-p/398362#M1040</guid>
      <dc:creator>adelhoss</dc:creator>
      <dc:date>2020-02-21T06:10:17Z</dc:date>
    </item>
    <item>
      <title>Re: Could not create ssl tls secure channel .net library api</title>
      <link>https://www.dropboxforum.com/t5/Discuss-Dropbox-Developer-API/Could-not-create-ssl-tls-secure-channel-net-library-api/m-p/398422#M1041</link>
      <description>&lt;P&gt;If there's an issue with the official&amp;nbsp;Dropbox .NET SDK, we'll&amp;nbsp;&lt;SPAN style="font-family: inherit; background-color: #ffffff;"&gt;be happy to look into it, but we'll need some more information. Please reply with:&lt;/SPAN&gt;&lt;/P&gt;
&lt;P&gt;- the name and version number of the platform and SDK you are using&lt;BR /&gt;- the steps to reproduce the issue, including relevant code snippet(s)&lt;BR /&gt;- the full text of any error or unexpected output&lt;/P&gt;</description>
      <pubDate>Fri, 21 Feb 2020 14:03:55 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Discuss-Dropbox-Developer-API/Could-not-create-ssl-tls-secure-channel-net-library-api/m-p/398422#M1041</guid>
      <dc:creator>Greg-DB</dc:creator>
      <dc:date>2020-02-21T14:03:55Z</dc:date>
    </item>
    <item>
      <title>Re: Could not create ssl tls secure channel .net library api</title>
      <link>https://www.dropboxforum.com/t5/Discuss-Dropbox-Developer-API/Could-not-create-ssl-tls-secure-channel-net-library-api/m-p/592657#M2539</link>
      <description>&lt;P&gt;I've encountered the same issue as you. I managed to fix it by adding the following lines of code&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&lt;BR /&gt;ServicePointManager.Expect100Continue = true;&lt;BR /&gt;ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;before calling the dropbox functions, e.g. in the Main() function of the application.&lt;/P&gt;</description>
      <pubDate>Fri, 22 Apr 2022 09:55:13 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Discuss-Dropbox-Developer-API/Could-not-create-ssl-tls-secure-channel-net-library-api/m-p/592657#M2539</guid>
      <dc:creator>SHommersom</dc:creator>
      <dc:date>2022-04-22T09:55:13Z</dc:date>
    </item>
    <item>
      <title>Re: Could not create ssl tls secure channel .net library api</title>
      <link>https://www.dropboxforum.com/t5/Discuss-Dropbox-Developer-API/Could-not-create-ssl-tls-secure-channel-net-library-api/m-p/603306#M2706</link>
      <description>&lt;P&gt;The error is generic and there are many reasons why the SSL/TLS negotiation may fail. ServicePointManager.SecurityProtocol property selects the version of the Secure Sockets Layer (SSL) or Transport Layer Security (TLS) protocol to use for new connections; existing &lt;A href="http://csharp.net-informations.com/communications/csharp-socket-programming.htm" target="_self"&gt;c# socket&lt;/A&gt; connections aren't changed. Make sure the ServicePointManager settings are made before the HttpWebRequest is created, else it will not work. Also, you have to enable other security protocol versions to resolve this issue:&lt;BR /&gt;&lt;BR /&gt;ServicePointManager.Expect100Continue = true;&lt;BR /&gt;ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12&lt;BR /&gt;SecurityProtocolType.Tls&lt;BR /&gt;SecurityProtocolType.Tls11&lt;BR /&gt;SecurityProtocolType.Ssl3;&lt;BR /&gt;&lt;BR /&gt;//createing HttpWebRequest after ServicePointManager settings&lt;BR /&gt;HttpWebRequest request = (HttpWebRequest)WebRequest.Create("&lt;A href="https://google.com/api/" target="_blank"&gt;https://google.com/api/&lt;/A&gt;")&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;If you create HttpWebRequest before the ServicePointManager settings it will fail and shows the error message.&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;</description>
      <pubDate>Wed, 15 Jun 2022 06:10:19 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Discuss-Dropbox-Developer-API/Could-not-create-ssl-tls-secure-channel-net-library-api/m-p/603306#M2706</guid>
      <dc:creator>warnerjonn</dc:creator>
      <dc:date>2022-06-15T06:10:19Z</dc:date>
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