Webservice not able to download the files

Hi All,

Iam using a webservice to downlad the html, audio and video files from the broadcast server and save it in the relay server after creating the folder, but the file is not getting created and also not able to download the files and iam getting Event 1309 warning stating There is an Internal server error(500). Here is the code below and do guide me on the same :

Dim strSaveAsFileNameWithPath As String = ConfigurationManager.AppSettings("FileEncryptFolder") + strFileName
 Const ChunkSize As Integer = 10000
 Dim iStream As System.IO.Stream = Nothing
 Dim iBroadcastStream As System.IO.Stream = Nothing
 'Dim bytesFileChunk As Byte()
 Dim FileSize As Integer = 0
 'Dim Buffer(ChunkSize) As Byte
 
 
 Dim strMutexName As String = strFileName
 
 Dim strProxyURL As String = String.Empty
 Dim iProxyPort As Integer
 Dim sCompanyID As String = context.Request.QueryString("CID")
 Dim BroadcastServerURI As String = ConfigurationManager.AppSettings("BroadcastServerURI") + strFileName + "&CID=" + sCompanyID
 If strSaveAsFileNameWithPath.Contains("[COMPANYID]") Then
  strSaveAsFileNameWithPath = strSaveAsFileNameWithPath.Replace("[COMPANYID]", sCompanyID)
 End If
 
 If Not ConfigurationManager.AppSettings.Item("ProxyURL") Is Nothing Then
  strProxyURL = ConfigurationManager.AppSettings.Item("ProxyURL").ToString.Trim
 End If
 If Not ConfigurationManager.AppSettings.Item("ProxyPort") Is Nothing Then
  iProxyPort = CInt(ConfigurationManager.AppSettings.Item("ProxyPort").ToString.Trim)
 End If
 
 'RelayRemoteFile can create a RACE condition as such use mutex to block subsecutive calls
 Using mutex As New Mutex(False, strMutexName)
  mutex.WaitOne()


 
         'Const ChunkSize As Integer = 10000
 Dim readLen As Integer = 0
 Dim ncAuthorize As NetworkCredential = CredentialCache.DefaultNetworkCredentials 'New NetworkCredential("Username", "Password", "Domain")
   Dim ohttpWebRequest As HttpWebRequest = DirectCast(WebRequest.Create(BroadcastServerURI), HttpWebRequest)
 If (Not String.IsNullOrEmpty(strProxyURL)) Then
  objProxy = New WebProxy(strProxyURL, iProxyPort)
  objProxy.Credentials = CredentialCache.DefaultNetworkCredentials
  ohttpWebRequest.Proxy = objProxy
 End If
 
  ohttpWebRequest.Credentials = ncAuthorize
 Dim ohttpWebResponse As WebResponse = ohttpWebRequest.GetResponse()
 Dim Buffer(ChunkSize) As Byte
 Using responseStream As Stream = ohttpWebResponse.GetResponseStream()
 Using oStream As Stream = File.Create(strSaveAsFileNameWithPath)
 While True
  readLen = responseStream.Read(Buffer, 0, Buffer.Length)
 If readLen = 0 Then Exit While ' EoF
  oStream.Write(Buffer, 0, readLen)
 End While
 End Using
 End Using
 
  RelayLocalFile(context, strSaveAsFileNameWithPath)
 
  mutex.ReleaseMutex()
 End Using
Thanks,
Rams