PDFs missing EOF section on customer's server - asp.net

Question

Folks- I'm relatively new to ASP.NET, and have a question that has stumped my peers-- folks much more experienced than myself.
My company created a website that uses iTextSharp to build and stream PDFs. The functionality works perfectly on my company's development and staging/test servers. The customer's functionality isn't working well, however. The customer's server streams a file where the PDF is missing the last block of data representing the EOF section. The PDF seems to build correctly, streams correctly, but when users open the PDF, the following error displays: 'There was an error opening this document. The file is damaged and could not be repaired.'
By comparing the PDFs in a text viewer (comparing the PDFs from my server vice the customer's server), I can see that the EOF section is missing from the customer's PDF. I'll also note that no errors are thrown during PDF creation, if that's helpful. To make matters more difficult, I have no access to the customer's servers, so I won't be able to interact with the systems directly.
The asp.net version is 3.5. Both of our servers (my company and the customer) are: running IIS7.5 on Server 2008R2; using iTextSharp is 5.1.2; and are configured for FIPS compatibility.
I've read dozens and dozens of posts detailing why a PDF isn't created properly, why it may not be streaming, and all things related, but I haven't seen this particular issue before. I guess what I need to know in the short-term is: 1) what can I provide to help diagnose the issue, 2) where is a good place to start looking for areas of concern?
Also, I updated to revision 5.5.3 last night; same results-- it works fine on my servers, but produces broken PDFs on the customer's server.
Code added:
Public Function BuildReport(ByVal tblReport As DataTable, _
ByRef memStream As MemoryStream, _
ByRef strErrMsg As String) As Boolean
Dim booOK As Boolean = True
strErrMsg = String.Empty
' Create document
Try
' Create writer (listens to the document and directs PDF stream)
memStream = New MemoryStream()
Dim msWriter As PdfWriter = PdfWriter.GetInstance(_document, memStream)
msWriter.CloseStream = False
'Create header
Dim ev As New itsEvents
msWriter.PageEvent = ev
' Set document metadata
_document.AddTitle(_strMetaTitle)
_document.AddSubject(_strMetaSubject)
_document.AddCreator(_strMetaApplication)
_document.AddAuthor(_strMetaAuthor)
' Open document, add document content, close document
_document.Open()
AddReportContent(tblReport)
_document.Close()
Catch ex As Exception
booOK = False
strErrMsg = ex.Message
End Try
Return booOK
End Function
Private Sub AddReportContent(ByVal tblReport As DataTable)
' Count report columns
Dim intReportColumns As Integer = 0
For Each col As DataColumn In tblReport.Columns
If ContainedInColumnMask(col.ColumnName) Then
intReportColumns += 1
End If
Next
' Build table
Dim table As PdfPTable
Dim cell As PdfPCell
Dim phrase As Phrase
If intReportColumns >= 1 Then
' Init table
table = New PdfPTable(intReportColumns)
' Add title to table
'phrase = New Phrase(_strMetaTitle, _fontLarge)
'cell = New PdfPCell(phrase)
'cell.Colspan = intReportColumns
'cell.HorizontalAlignment = 1 ' 0=Left, 1=Centre, 2=Right
'table.AddCell(cell)
' Add column headers to table
Dim i As Integer = 0
Dim intColWidth As Integer
Dim intColWidths As Integer() = New Integer(intReportColumns - 1) {}
Dim intColWidthTotal As Integer = 0
Dim strColName As String
For Each col As DataColumn In tblReport.Columns
If ContainedInColumnMask(col.ColumnName) Then
strColName = col.ColumnName
If (col.ExtendedProperties.Item("NOTEXTEXPORT") <> True) Then
If col.ExtendedProperties.Contains("FRIENDLYNAME") Then
strColName = col.ExtendedProperties.Item("FRIENDLYNAME")
End If
End If
phrase = New Phrase(strColName, _fontMedium)
cell = New PdfPCell(phrase)
cell.BorderWidth = 1
cell.BackgroundColor = iTextSharp.text.BaseColor.LIGHT_GRAY
'cell.BackgroundColor = iTextSharp.text.Color.LIGHT_GRAY
table.AddCell(cell)
intColWidth = GetColumnWidth(col, strColName, _fontMedium.Size, _fontSmall.Size)
intColWidths(i) = intColWidth
intColWidthTotal += intColWidth
i += 1
End If
Next
table.TotalWidth = intColWidthTotal
table.SetWidths(intColWidths)
' Add rows to table
For Each row As DataRow In tblReport.Rows
For Each col As DataColumn In tblReport.Columns
If ContainedInColumnMask(col.ColumnName) Then
phrase = New Phrase(SetBlankIfNothing(row.Item(col.ColumnName).ToString()), _fontSmall)
cell = New PdfPCell(phrase)
cell.BorderWidth = 0.5
table.AddCell(cell)
End If
Next
Next
Else
' Init table
table = New PdfPTable(1)
' Nothing to add to table
table.AddCell(String.Empty)
End If
' Add table to document
_document.Add(table)
End Sub
Public Sub New(ByVal strMetaTitle As String, _
ByVal strMetaSubject As String, _
ByVal strMetaApplication As String, _
ByVal strMetaAuthor As String, _
Optional ByVal strColumnMask As String = "")
GetStaticInfo()
_strMetaTitle = strMetaTitle
_strMetaSubject = strMetaSubject
_strMetaApplication = strMetaApplication
_strMetaAuthor = strMetaAuthor
_document = New iTextSharp.text.Document(_itsPage, _itsMarginLeft, _itsMarginRight, _itsMarginTop, _itsMarginBottom)
If strColumnMask <> "" And Not strColumnMask Is Nothing Then
_strColumnMask = strColumnMask
End If
End Sub
Public Sub New(ByVal strMetaTitle As String, _
ByVal strMetaSubject As String, _
ByVal strMetaApplication As String, _
ByVal strMetaAuthor As String, _
Optional ByVal strColumnMask As String = "")
GetStaticInfo()
_strMetaTitle = strMetaTitle
_strMetaSubject = strMetaSubject
_strMetaApplication = strMetaApplication
_strMetaAuthor = strMetaAuthor
_document = New iTextSharp.text.Document(_itsPage, _itsMarginLeft, _itsMarginRight, _itsMarginTop, _itsMarginBottom)
If strColumnMask <> "" And Not strColumnMask Is Nothing Then
_strColumnMask = strColumnMask
End If
End Sub