Port / Socket Remains Open After Crash
Aug 14, 2009
I'm having this problem with a networked app in vb.net. If the program exits normally the port closes fine, however, if it crashes sometimes it remains open and I am unable to close it. The next time I run the program it is unable to open the port because it is already in use. Here's the exception: 10048: Only one usage of each socket address (protocol/network address/port) is normally permitted on how I can reclaim this port, or how I can close it? I tried using the reuse address socket option
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Apr 20, 2010
There is a bug report [URL] on serious problems that can occur if you are using a USB to serial port converter and the user pulls the USB while the serial port is in use. Apparently the bug is still present in VB2010, and Microsoft still has the bug closed.
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Dec 13, 2011
I have a Main form, a Login form and a Splash form. In the project settings I've set the Splash screen.
System.Threading.Thread.Sleep(3000)
Login.ShowDialog()
If Login.DialogResult <> DialogResult.OK Then
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Sep 3, 2010
I am using a toolstripDropdownbutton on the toolstrip to populate the
menuItems.The toolstrip is on the customtaskpane of the window.
Problem comes when the focus is on the customtaskpane, user opens a dropdown menu and without selecting any menu from the dropdown click on the other part of the window. The dropdown remains open and even the user switch to other window it remains open and does not hide. It only hide when user click on the dropdownbutton itself.
Note : I had set AutoClose property to Flase
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Dec 23, 2009
my application will remain open after closing every form. This is a recent issue in previous versions my application would close. I call dispose(true) on all form closing/closed events. (some forms require it on closing instead of close because of some custom made classes.)?
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Nov 20, 2011
Basically my script doesn't properly close Word, and it still remains open. Then when I try to run the script again it says its Read-only as its opened..What I need it to do is - put the TextBox1 info onto the DOC - and print it. I don't want it to save, as it's a template. I've tried saving it somewhere else as a "temp" to get rid of this read only but it still doesn't work.Another issue also is that it's trying to close the document before the printing dialog disappears, so I've had to put a timer
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim pName As String[code]....
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Oct 22, 2009
I'm try on Ultimate version and Express version. Reinstall many time from web install and offline install. What should I do ?
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Apr 17, 2008
I have a socket which I use to monitor data on a specific UPD port (Let's say 1200).[code]...
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May 26, 2009
i'm using socket programming in vb.net 2005 and make a Server/Client windows application and it used in the network to multi user chat server and havent error and it work , but one BUG in server app : the Server app. work currently until the number of clients more than 30 and then it crashed . and error is "socket.exception" . now tell me what to do ??? it's very very important to me because the number of server's CRASH in on day more than 10 time and i end it and then run again and it's not good for my job .
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Aug 3, 2009
Event type clr20r3 p3 4a5c12c0 system.net.sockets.socket Exception and Application crash on some system. while running well on others. i go thorugh many forms and search a lot on google but not able to resolve the issue.
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Jun 2, 2010
I have a device which send me data over a particular port. The data is in XML Format.
Now I already did a small console application which listen for the data and print out the data on the screen.
Now my plans are to deserialize the xml data or I will create the insert statement into the database.
1) The device send me the data every second (if there is data to send me).
2) I cannot say how much data the device is going to send me.
How can I make sure to capture all data without loose any information..
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Apr 21, 2008
I am new to socket communication. I found a few samples on the web and I managed to make my own host-client communication but i wanted to go a bit further and connect to port 80 of a server and it was just a disaster! First of all I know I can just use the functions that vb has itself but I want to make my own connections ... I have got some reasons I need this one! Do I really have to make them "connect" or just somehow without connecting I get the data? So I'm stack at the point that the connection is made ... it refuses to connect.
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Mar 11, 2010
I have an application to make a server and clients to read/ send text to it but I want a program I can run from a remote computer that you enter the ip and port and it crashes the server.
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May 14, 2010
The fact is I'm making an application, which users can install by using a Setup file...once installed the data in the database can be updated by a centralized server. To do this, they can insert a DVD/CD-ROM and export the necessary data towards it. I need to do it that way, because some of the users who really need this data will be using stand alone computers.The application gets it's data from a mdb-file and the connection remains open as long a person works with the application (maybe not the best way to do, but I know :-) )...when the user uses the application, he can perform an export...this exports the .ini-file and pictures (which works fine), but he also needs to export the mdb behind the application...I already tried connection.close() before and connection.open() after the System.IO.File.Copy...but that doesn't seems to work.
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Mar 23, 2009
My current project is a program that collects meteorolgical data on one computer and allows to access it from any other computer on the net.Everything is working fine so far - it is collecting the data, doing some computation and then listening (as server, TCP) on some port for a client who is interested in downloading this data.When it receives some short command string (something like "GET DATA") it just starts sending the data to the client. The transmission works.
At this point I am getting a bit nervous because I absolutely have no idea on the programming basis of viruses and other malware:When the program is listening on the port (for which I have to allow an exception in the firewall) is there any danger that malware from outside intrudes into the computer?(running Windows XP with latest service packs installed, firewall enabled, antivirus-program installed (is this necessary if there is absolutely no internet activity on the computer besides of this data sampling / server program?)).
If there is danger, what could I do to protect the computer aside from closing the port which I need for communication with the external world?Can you point me to some URL where I can alleviate my ignorance of the basics of malware functioning (on the software level)?
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Sep 30, 2010
I'm writing a remote desktop software that starts a connection in reverse mode, using RDP API. My problem is that I try to setup the port that the listening socket may use, but it seems not working: it uses always a random port. [Code] The problem is the seems PortId is ignored: my connection string reports other ports number, and the incoming socket is open on port different from 4000.
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Jun 30, 2010
I wanted to know what are the risks of opening up a socket server on a specified port? Right now I have it limited to only accept requests from 1 specific IP to that port and all the other ones get rejected (using the windows firewall), is there a way to implement an authentication or anything else so I can allow it to be accessed from any IP worldwide yet have it secured?
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Sep 10, 2009
I have a appliction developed on Visual studio 2003, .Net Frame work 1.1.After I migarted that application to Visual studio 2008, .Net Frame work 3.5, Visual Studio is crashed as opening some Visual basic designer files by Visual Basic Form Editor.The below is detail error message of Visual studio:
Problem signature:
Problem Event Name: CLR20r3
Problem Signature 01: devenv.exe[code]......
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Sep 21, 2010
I've inherited a tested function that processes incoming data from a .NET Serial Port. (Dim RXBuffer as string = serialport1.ReadExisting) I've written a different part of the application that processes a byte array as received from an asynchronous .NET socket.
Is there a way I can convert the byte array into a string as if it arrived from the serial port?
I would prefer to rewrite a very long 'if statement' into byte array functions syntax that look like:
dim b as boolean = IsBitSet(state_buffer(i), j) 'rather than:
dim b as boolean = (Asc(Mid(RXPacket.Pdu, CInt((i - (i Mod 8)) / 8) + 1, 1)) And CInt(2 ^ (i Mod 8))) > 0
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Aug 11, 2009
SocketException was Unhandled: Only one usage of each socket address (protocol/network address/port) is normally permitted I get this error every time i click collect a second time.
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Dec 28, 2010
I'm making a Visual Basic GUI application to display whether a number of my ports are open for people to know whether things like my website and my Minecraft server are open.My problem is I have absolutely no idea how to do this in Visual Basic.Basically, I'm asking for something which sends a signal to an IP with a specific port, if it is open then return true, if it's closed, return false. Similar to: http:[url]....
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Jan 17, 2012
I need to transfer data between several computers in a network using my app. I thought of using TCP ports. how to open and use them? I only want to make a file transfer and chat app that works offline.
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May 21, 2011
I wrote a Socket Client which will send the Socket Server some data and get some response from Server. This process will be running once in every 2 seconds.
Now what I need to know is How we can identify the connection lost between Server and Client?
I need this to be implemented in the Client side. If there is no connection then Client should automatically close the connection. Once the connection with the server is available in the next attempt it should connect automatically.
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Jun 9, 2011
how to open all serial port in vb.net? i know how to open by getportname..but how to open all??can we do it?
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Apr 1, 2010
how can i open port 433 in my windows
i don't want any code just i want to open open it
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Sep 1, 2010
Public Class my_class Dim WithEvents COMPort As New System.IO.Ports.SerialPort
Public Sub FindReader()
Dim ports As String() = IO.Ports.SerialPort.GetPortNames()
Dim port As String
For Each port In ports
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When it runs, it shows a single COM port "COM1". I am assured that the device attached to it is a standard 8,n,1 and uses 9,600 baud. The exception is "Acess to the port 'COM1' is denied".
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Aug 10, 2009
I am trying to open a GPS device on a serial port but no matter what I try I just keep getting an IOException. This is on a pocket PC BTW.
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Nov 24, 2011
I have an application which need to send data to particular system on specific port. But the application gets hang if the target system port is closed.
I Want to know if a particular Port is open on a specific IP address so that i can continue my next task. PBL (Visual Studio 2010 Ultimate)
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Feb 16, 2010
I have written some code to check if a port is open. I'm currently trying to work with the system.net.sockets name space.I know that the easy way out would be to use AxWinsock, but I don't think the AxWinSock is very cool, nor do I think it's very professional when trying to make network applications in VB.NET.
I've got this Error message : Socket Exception Was unhandled, No connection could be made because the target machine actively refused it 127.0.0.1:1 IDK, Like I said, I'm new to the System.net.sockets namespace, I'm pretty good with other stuff in VB.NET, but when it comes to the serious stuff like the system.net.sockets namespace, I'm not so great.look at this code and tell me what I am doing wrong, I've manged to get this far, and I don't want to just give up and continue watching my movie.
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Aug 6, 2009
I have this problem says that "the portName cannot be set while the port is open". When this errors occurred, my application on sending sms could not work. Before I edit the application can work but after making some changes and ask help in this forum, the application does not work and gives errors and it says "the portName cannot be set while the port is open".
Imports System.Windows.Forms.Form
Imports System.Text.Encoding
Imports System.Threading
Imports System.IO.Ports
[code]....
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