by Njål

Fixing HttpException 0x80004005 / COMException 0x80070001

When getting HttpContext.Current.Request.Params in a C# .NET IIS website – we got this error several times a day:

System.Web.HttpException (0x80004005): An error occurred while communicating with the remote host. The error code is 0x80070001. —> System.Runtime.InteropServices.COMException (0x80070001): Incorrect function. (Exception from HRESULT: 0x80070001)
at System.Web.Hosting.IIS7WorkerRequest.RaiseCommunicationError(Int32 result, Boolean throwOnDisconnect)
at System.Web.Hosting.IIS7WorkerRequest.ReadEntityCoreSync(Byte[] buffer, Int32 offset, Int32 size)
at System.Web.HttpRequest.GetEntireRawContent()
at System.Web.HttpRequest.GetMultipartContent()
at System.Web.HttpRequest.FillInFormCollection()
at System.Web.HttpRequest.EnsureForm()
at System.Web.HttpRequest.get_Form()
at System.Web.HttpRequest.FillInParamsCollection()
at System.Web.HttpRequest.GetParams()

 

Turns out that this is related to various offloading done by the Network Card (NIC) – meaning that the NIC is doing stuff on its own which the OS/IIS doesn’t always like. Go to the network card properties – and disable these features:

  • Flow Control
  • Ipv4 Checksum Offload
  • Large Send Offload V2 (IPv4)
  • Large Send Offload V2 (IPv6)
  • TCP Checksum Offload (IPv4)
  • TCP Checksum Offload (IPv6)
  • UDP Checksum Offload (IPv4)
  • UDP Checksum Offload (IPv6)

 

image

 

Also – make sure you disable Power Management for the NIC.

image

 

 

by Njål

The directory specified for caching compressed content is invalid. Static compression is being disabled.

image

 

After adding this in my web.config (Azure Project)…

<staticContent>
    <mimeMap fileExtension=".svg" mimeType="image/svg+xml" />
</staticContent>

…IIS refused to serve any static content – such as js and png files. Log entries in Event Viewer said:

The directory specified for caching compressed content
C:UsersxxxAppDataLocaldftmpResourcesb503ce54-3fba-4772-beaa-415d94ffc214temptempRoleTempiisexpressIIS Temporary Compressed Files9ef2ab2d-28fc-4554-a09c-5ba867eb1d19 is invalid.
Static compression is being disabled.

The problem was that .svg files were already added to the staticContent list in my applicationHost.config – but still – the error message shown in the Event Viewer is pretty useless. There is nothing wrong with the directory specified to store compressed content.

So if you suddenly get this error – undo any changes in Web.config (remove all config under staticContent) and restart IIS (Express).