VB Gives "The Operation Has Timed Out"?

Sep 30, 2010

I want to frequently read some data from some Internet pages, so I've written a loop and I've used WebRequest Class to download data. After running it, in 1st loop's repeat it read the data properly but in the 2nd repeat it gave "The operation has timed out!" message. All web addresses are correct (I've checked them). Should I close request or something else after each loop's repeat. The brief code is here:

[Code].....

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HTTPWebRequest - Operation Has Timed Out

May 26, 2011

I am using an httpWebRequest in my windows app to download files from a webserver (sURL), to a local folder (fileDestination) as such:
Public Function DownloadFile(ByVal sURL As String, _
ByVal fileDestination As String, _
ByVal WebRequestType As String) As Boolean
Dim URLReq As HttpWebRequest
Dim URLRes As HttpWebResponse
[Code] .....

This works fine for the first few files. But then it starts giving the error:
"operation has timed out"
on the URLReq.GetResponse line.

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The Operation Has Timed Out On Downloading File

Nov 18, 2011

i have a datagridview and each row got link.. and i using timer and backgroundworker as downloading file.. the 1st file download, its perfect working.. but when its going to download 2nd link from datagridview, nothing happened.. even its said, "The operation has timed out"..

[Code]...

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VS 2008 Port1.ReadByte() - The Operation Has Timed Out?

Feb 2, 2009

When I push in my program button which read data from serial port, then when are here not data, it write this error which stop program:The operation has timed out.When I push in my program button to read data from serial port and when the data exists there, then is all OK...Please what can I do for eliminating this message = when are not data in serial port, then I want become NO DATA and when exists data in serial port then I write this data....Here is shorted program:

Private Sub program_Load(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles MyBase.Load
Port1.PortName = "COM1"

[code].....

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VS 2008 Port1.ReadByte() - The Operation Has Timed Out

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When I push in my program button which read data from serial port, then when are here not data, it write this error which stop program:The operation has timed out.When I push in my program button to read data from serial port and when the data exists there, then is all OK...what can I do for eliminating this message = when are not data in serial port, then I want become NO DATA and when exists data in serial port then I write this data....

Private Sub program_Load(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles MyBase.Load
Port1.PortName = "COM1"
Port1.BaudRate = 9600
Port1.DataBits = 8

[code].....

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Nov 4, 2009

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[Code]...

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I am calling 5 external servers to retrieve XML-based data for each request for a particular webpage on my IIS 6 server. Present volume is between 3-5 incoming requests per second, meaning 15-20 outgoing requests per second.

99% of the outgoing requests from my server (the client) to the external servers (the server) work OK but about 100-200 per day end up with a "The operation has timed out" exception.

I have a resource problem on my server - some shortage of sockets, ports etc or a thread lock but the problem with this theory is that the failures are entirely random - there are not a number of requests in a row that all fail - and two of the external servers account for the majority of the failures.

My question is how can I further diagnose these exceptions to determine if the problem is on my end (the client) or on the other end (the servers)?

The volume of requests precludes putting an analyzer on the wire - it would be very difficult to capture these few exceptions. I have reset CONNECTIONS and THREADS in my machine.config and the basic code looks like:

Dim hRequest As HttpWebRequest
Dim responseTime As String
Dim objWatch As New Stopwatch

[Code].....

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I am trying to Send an Email with an attachment (using Gmail) but I keep getting errors like "Operation Timed out" or Failure Sending Email". It was working earlier today but I found out that i needed to add Using statement because the email was having a file open that had to be deleted after it was sent but afterwards it doesn't work.

Here's what I have (Portion of it):
Private Sub SendMailOneAttachment(ByVal un As String, ByVal pass As String, Optional ByVal smtp As String = "smtp.gmail.com")
Using oAttach As Net.Mail.Attachment = New Net.Mail.Attachment((Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData) & "\" & My.Computer.Name & "_" & fName & " .zip"))
Dim client As SmtpClient = New SmtpClient(smtp)
[Code] .....

The ports are correct I believe, no firewall up on my PC...

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Delphi combines the two substrings, while .Net just concatenate them like a copy.

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Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim req As HttpWebRequest

[code]....

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After about 10 minutes I keep getting operation timed out exception.

If I restart the program it works again for 10 minutes.

Looks like there is a memory leak or something.

Some says that webclient uses webrequest object somewhere. I do not see it in watch though.

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Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim Code As Integer
Dim Version As Integer

[code]....

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Code:
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[Code].....

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If closingdown = False Then

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[Code]....

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