system.net.webexception:the remote server returned an error 417 expectation failed

Question

Hi All,
 
I am getting the following error when I am sending an SMS through http webrequest from my service :
 
system.net.webexception:the remote server returned an error 417 expectation failed. we are using proxyserver.
I have tried changing the machine.config with the following settings, still no success.
 
<system.net>
<settings>
<servicepointmanager expect100continue="false" />
</settings>
</system.net>

Answer 1

this also didnot work. Thanks for your fast reply. iam stuck up with the following error :

"system.net.webexception:the remote server returned an error 417 expectation failed
 at MBS.SmsMgr.SendSMS(Object stringPost)
   at MBS.Dispatcher.CommonProcedures.SendSMS(CommonProcedures objparams)".

Please do find the code below :

Public Function SendSMS(ByVal stringPost As System.Object) As String Implements ISmsMgr.sendSMSDim strReturnValue As String = String.EmptyDim objWebRequest As HttpWebRequest = Nothing

Dim objWebResponse As HttpWebResponse = Nothing

Dim objStreamWriter As StreamWriter = Nothing

Dim objStreamReader As StreamReader = Nothing

Try

Dim strProxyURL As String = String.EmptyDim iProxyPort As Integer = 0If Not ConfigurationManager.AppSettings.Item("ProxyURL") Is Nothing Then

strProxyURL = ConfigurationManager.AppSettings.Item(

"ProxyURL").ToString.TrimEnd If

If Not ConfigurationManager.AppSettings.Item("ProxyPort") Is Nothing Then

iProxyPort =

CInt(ConfigurationManager.AppSettings.Item("ProxyPort").ToString.Trim)End If

Dim strSMSDialerConnectionName As String = ConfigurationManager.AppSettings("SMSDialerConnectionName")Dim iAvailConType As Integer = DetectConnection()If iAvailConType = enmConnectionType.NOTCONNECTED Then ' If not connected,

'Then detect the Modem connection and Dialp up.

If Not String.IsNullOrEmpty(strSMSDialerConnectionName) Then

Dim chSplit() As Char = {";"}Dim strDialeConnections() As String = strSMSDialerConnectionName.Split(chSplit)If strDialeConnections.Length > 0 Then

For i = 0 To strDialeConnections.Length - 1If DialupConnection(strDialeConnections(i)) Then

iAvailConType = enmConnectionType.MODEM

strProxyURL =

iProxyPort = 0

String.EmptyIf Not ConfigurationManager.AppSettings.Item("DailUpProxyURL") Is Nothing Then

strProxyURL = ConfigurationManager.AppSettings.Item(

"DailUpProxyURL").ToString.TrimEnd If

If Not ConfigurationManager.AppSettings.Item("DailUpProxyPort") Is Nothing Then

iProxyPort =

CInt(ConfigurationManager.AppSettings.Item("DailUpProxyPort").ToString.Trim)End If

Exit For

End If

Next

End If

End If

End If

If iAvailConType <> enmConnectionType.NOTCONNECTED Then

objWebRequest =

Dim bytesToSend As Byte() = Encoding.UTF8.GetBytes(stringPost)Dim strSMSApi As String = ConfigurationManager.AppSettings.Item("SMSApi").ToStringDirectCast(WebRequest.Create((strSMSApi & "?") + stringPost.ToString()), HttpWebRequest)'add eventvwr : laxman

EventLog.WriteEntry(

"SENDSMS.strSMSApi ", (strSMSApi & "?") + stringPost.ToString())'(strSMSApi & "?") + stringPost.ToString()

objWebRequest.Method =

"POST"

If (Not String.IsNullOrEmpty(strProxyURL.Trim)) Then

objProxy =

objProxy.Credentials = CredentialCache.DefaultNetworkCredentials

objWebRequest.Proxy = objProxy

New WebProxy(strProxyURL, iProxyPort)End If

objWebRequest.ContentLength = bytesToSend.Length

objWebRequest.ContentType =

"application/x-www-form-urlencoded"

objStreamWriter =

objStreamWriter.Write(stringPost)

objStreamWriter.Flush()

objStreamWriter.Close()

objWebResponse =

objStreamReader =

strReturnValue = objStreamReader.ReadToEnd()

objStreamReader.Close()

New StreamWriter(objWebRequest.GetRequestStream())DirectCast(objWebRequest.GetResponse(), HttpWebResponse)New StreamReader(objWebResponse.GetResponseStream())

Answer 2

Hi Ram,

Please see below link.

http://code.google.com/p/duplicati/issues/detail?id=378.

Hope it will help you to solve the error.

Thanks.

Answer 3

Hi,

Thanks for the reply.. we tested the same service in our network..it is showing succesfull..but the client is using a proxy server which i think is creating a problem..

Answer 4

Can you read HttpWebRequest's Expect property and paste it here? That should be the root cause of the problem - web request is sending something in the Expect HTTP header and remote Web server is unable to comply so it responds with 417 error.

Give us precise Expect value you're sending.

Zoran