kbt153873

Issue

Symptoms

When browsing to SmartForms Runtime forms, the theme will not load.  A 500 error will be found in browser’s console.

When enabling SmartForms logging:
<add key="Forms.Global.ErrorLogging.Enabled" value ="true" />
<add key="Forms.Global.ErrorLogging.FilePath" value ="C:DebugSourceCode.Forms.Web.error" />

The following errors were found:

Failed to get resource: /Runtime/Styles/Themes/Lithium.css?_v=5.1004.18130.3
Exception:
SourceCode.Forms.AppFramework.AsyncException: Asynchronous operation failed ---> System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a send. ---> System.IO.IOException: Authentication failed because the remote party has closed the transport stream.
   at System.Net.TlsStream.EndWrite(IAsyncResult asyncResult)
   at System.Net.ConnectStream.WriteHeadersCallback(IAsyncResult ar)
   --- End of inner exception stack trace ---
   at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
   at SourceCode.Forms.AppFramework.CombinedResourceUtility.RetrieveRequestComplete(IAsyncResult ar)
   --- End of inner exception stack trace ---
   at SourceCode.Forms.AppFramework.AsyncResult.EndRequest()
   at SourceCode.Forms.AppFramework.CombinedResourceHandler.ProcessRequest(HttpContext context, CacheEntry entry)

InnerException:
System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a send. ---> System.IO.IOException: Authentication failed because the remote party has closed the transport stream.

   at System.Net.TlsStream.EndWrite(IAsyncResult asyncResult)
   at System.Net.ConnectStream.WriteHeadersCallback(IAsyncResult ar)
   --- End of inner exception stack trace ---   at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)   at SourceCode.Forms.AppFramework.CombinedResourceUtility.RetrieveRequestComplete(IAsyncResult ar)

InnerException:
System.IO.IOException: Authentication failed because the remote party has closed the transport stream.
   at System.Net.TlsStream.EndWrite(IAsyncResult asyncResult)
   at System.Net.ConnectStream.WriteHeadersCallback(IAsyncResult ar)
URL: /Runtime/CombinedResource.ashx?d=xxx=&c=c&_v=5.1004.18130.3

Troubleshooting Steps

Adding the following Registry Key resolved the issue:
HKEY_LOCAL_MACHINESOFTWAREMicrosoft.NETFrameworkv4.0.30319 SchUseStrongCrypto
HKEY_LOCAL_MACHINESOFTWAREWow6432NodeMicrosoft.NETFrameworkv4.0.30319 SchUseStrongCrypto

Please see following reference for more details: https://support.microsoft.com/en-us/help/4040243/how-to-enable-tls-1-2-for-configuration-manager