20. April 2011 16:13
I started to get this "Specified method is not supported." error quite a lot since I moved one of the sites to Windows 2008 R2 64bit.
Exact error something like below
Server Error in '/' Application.
Specified method is not supported.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NotSupportedException: Specified method is not supported.
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
[NotSupportedException: Specified method is not supported.]
System.Drawing.ComStreamFromDataStream.Seek(Int64 offset, Int32 origin) +44
[HttpException (0x80004005): An error occurred while communicating with the remote host. The error code is 0x800703E3.]
System.Web.Hosting.IIS7WorkerRequest.RaiseCommunicationError(Int32 result, Boolean throwOnDisconnect) +3049599
System.Web.Hosting.IIS7WorkerRequest.ReadEntityCoreSync(Byte buffer, Int32 offset, Int32 size) +49
System.Web.Hosting.IIS7WorkerRequest.ReadEntityBody(Byte buffer, Int32 size) +23
System.Web.UI.Page.GetCollectionBasedOnMethod(Boolean dontReturnNull) +97
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +135
Above sample from a page where user submits multipart form data.
Same eror happens when user downlods file from a HttpHandler.
Actual error is quite confusing and as far as i understand it has nothing to do with System.Drawing but client disconnect during to upload proccess.
There is a bug report about I couldn't get any more info.
I have seen no side effects of this error and can say simply igonoring it is the current solution :)