Network Connections Disconnected After Launching .NET App?
Feb 17, 2011
I shipped a VB .NET app to my customer. They installed the app in program files folder. The app starts and everything works ok. Now my customer reports that some intranet TCP/IP connections are interrupted after starting the app. Sometimes they are not available after starting my app, sometimes the intranet connections are still available after my app has been started. After my app has been started, there are connection error messages to their intranet services. After re-starting the machine, they still can't connect to the intranet services. A fix is to login with another user name or re-load the profile from the server after they have been logged in on another machine.
Do you have any ideas where to start further investigations? Is it possible that my .NET app interrupts or blocks intranet connections? Could you recommend any trace tool that gives me a hint when and why the intranet connections are blocked? Why could it work for them after they login on another machine?I am wondering if my .NET app could disable the intranet connections. Do you have any recommendation for testing that?
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Feb 17, 2011
We are looking to design a security application that does the following on laptops:If the ethernet adapter is used (cable plugged in) disable/block all other network connections (wireless WIFI, mobile broadband (PPP), virtual VPN adapters etc)When ethernet adapter is not being used again, all connections allowed.We have looked in the WMI a lot but there are no good ways of doing this. Only disabling the network connection is not secure enough because most mobile broadband applications try to re-establish the connection. This should be an application that works on all laptop vendors without any user interaction (such as choosing interfaces etc..).
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Jul 19, 2011
Using VB.Net and SQL Server 2008 R2: I have recently had a database that using sp_who2 reflects a connection ".Net SqlClient Data Provider" is still active even though the .Net application has closed and disposed of all connections.
[Code]...
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Aug 18, 2009
Here is my idea so far: I have a bunch of computers connected in a local network. One of them is a MySQL server, one will have a vb.NET program wich will act as a "second server" and the rest will be different clients. What I want to do is that the "second server" will send out some kind of message or network package to some of the clients in the network, and they will execute a code based on what message it is, or what kind of package it is. I'll give you a simple example:
[Code]...
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May 19, 2010
I just read a book : Pro ADO.NET 2.0.It discuss about the disconnected and connected feature of the ADO.NET.In disconnected, the "data container" is DataSet.But it doesn't say anything about the data container if i use the connected feature. In ADO, we have recordset, what about ADO.NET.
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Jul 6, 2011
in the begining i cold the database (accdb 2007) (AGC)and the table(telp)
in form declaration
Dim cn As New OleDb.OleDbConnection Dim cmd As New OleDb.OleDbCommand Dim ad As New OleDb.OleDbDataAdapter Dim cmdb As New OleDbCommandBuilder Dim dbs As New DataSet
[code].....
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Feb 15, 2012
Is there any way to run code when COM object is about to be disconnected from RCW without implementing IDisposale interface and explicit call MyObject.Dispose in client code?
The code below is not working. When program enters Finalize sub, ExcelApplication is already disconnected from RCW, and I get error. I understand why it happens, but I want to get a solution.
I want to make it working the following way: when last managed reference is released, code from Finalize sub is executed before COM object is disconnected.
My question is - is it possible at all and if it is then how can I handle this event inside the class, without need to call Finalize explicitly from outside?
Very simple class:
Public Class ExcelRunner
Dim ExcelApplication As Excel.Application
Public Sub New()
[Code]....
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Dec 25, 2009
what is a disconnected architecture in dot net?Why are the dataSets a disconnected architectures in dot net?
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Apr 10, 2010
I am using the following code to receive data in a seprate thread
[code]...
Now if my client shuts down elegantly then my application knows that the client has disconnected but if my client is removed from the network or any other issue occurs them my application does not appear o know that the client disconnected why is this ??
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Apr 13, 2009
i am using the client/server classes for file transfer by moeur.what i want to know is that once my client is connected to the server and after that the client machine goes off the network. now when my server trys to send a file or some message to the client i am not able to trap the error that the client is disconnected.how to do this. there might be a case where the client machine suddenly shuts down. in such cases how will my server know that the client has disconnected.
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Sep 11, 2009
How do i trap a connection string that is disconnected?
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Sep 3, 2009
code to access SQL Server database in connected and disconnected mode through ADO .Net.
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Sep 2, 2011
I'm using an OLEDB connection to a Sybase database, with ADODB.dll file version 7.10.6070.0 (which comes from the Sybase 12.5 package). I need to be able to open a connection, use a command object to fill a recordset from a stored procedure, then close the connection and pass back a disconnected recordset. My attempts so far fail as every time I close the connection, my recordset also closes (which means it is not disconnected).
Is there a property I must set somewhere to indicate that the recordset should be disconnected? I cannot set Recordset.ActiveConnection = False because I get an exception ("Cannot change the ActiveConnection property of a Recordset object which has a Command object as its source."). I do set the Command.ActiveConnection = False, but that doesn't stop the recordset from closing as soon as I close the connection object.[code]...
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Feb 26, 2009
I'm using VB.Net 2005 Pro and have created an .msi for my app using the built-in installation deployment project.When the installation is running however (or at the end of the process) I need it to run another .msi which I'll include in my distribution.How would I go about that? I've tried adding a custom dialog to the installer but that won't run another .msi.
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Apr 6, 2012
i am having difficulty in lunching an application using vb the application i am trying to launch is a "MicroAppache" a distro of the Appache http server Background When the application is launched, it loads also some dll files and other dependencies.When i use this vb
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
System.Diagnostics.Process.Start("C:UsersvidhuDesktopwebserverinDebugMicApamapache.exe")
End Sub
to launch the exe. it doesnt load. instead it throws an error the it cannot find its dependencies. BUT When i place the vb app which launches the appache exe in the same directory as the appache exe. it works fine! It seems that the mapache.exe tries to find its depenancies in the directory where the launcher is and not in the directory he is in.Example If the launcher is located in:
C:launcher
and the Apache Server is located in
C:launcherapache
it will not work because it tries to find the other files it needs in
C:launch
If the launcher is located in:
C:launcherapache
and the Apache Server is also located in
C:launcherapache
it Will work
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Nov 18, 2011
I have a .NET 2.0 *.dll that calls My.Computer.Network.Ping(). The *.dll is then run out of an *.exe via AppDomain.CreateDomain() and Invoke(). The problem is that this works just fine under Windows XP but under Windows 7, I get an exception saying that no network connection is available. I tried the Ping() call out of a small console application under Windows 7 and it works just fine.
[Code]....
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Jul 26, 2010
I can create a shortcut using this code:
Dim sFolder As String, sTarget As String, sAppName As String
Dim oShell As New WshShell
Dim oShortcut As WshShortcut
[Code]....
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Dec 14, 2011
This is probaly a simple question, I am not a programmer I am a systems admin. I am trying to launch a application from a visual basic script. Everytime I run the script looks for the application in whatever folder the script is sitting in. If ut the script in the folder where the executable is it works. Unfortunatley this script need to run from users temp directories. What am I doing wrong'
' *****Declaring variables*****
Option Explicit
' Comment the next line out if you are not getting this to work and you need to debug.
[code]....
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Mar 8, 2009
Okay, I know how to launch a file with its associated app:Process.Start("File.mp3")And I know how to launch an executable: Process.Start("program.exe")This is the best I've been able to come up with for starting an executable with parameters:Process.Start("program.exe", "@ 'List of command line parameters'")Will that work?
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Mar 12, 2010
I am writing a basic little program. Amongst everything, my program will let you install printers remotely, To cut a long story shot I don't want to use the rundll32 shortcut to install as you can only remove the printer using rundll32 again which I don't want.
The way I wanted to do it is create a VBS script and execute it remotely using psexec. This didn't work for some reason, locally the script works fine but when executing it remotely the script runs but doesn't perform any of the actions inside the script.
The only other option I can think of is launching the VBS via WMI. I have done a bit of research and I cant seem to find any VB code that does anything similar.
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Sep 24, 2010
I was wondering if someone could help. I have a little vb.net program, an exe, a pdf and a pps all burned on a DVD.My vb.net program will autorun and I have command buttons to open each of the other items from the DVD.I can open all items if I use the proper path but not all rom drives are the same. I have searched for this a lot and there are a lot of inguiries regarding the same but none of the solutions seem to work.I have a work around for D:\ and E:\ drives:
Try
Process.Start("D:\MyPresentation\BHW.pps")
Catch
Process.Start("E:\MyPresentation\BHW.pps")
End Try
I use this for each command button.I have tried Process.Start(Application.Startuppath & "\MyPresentation\BHW.pps") to no avail.
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Feb 25, 2009
I'm using VB.Net 2005 Pro and have created an .msi for my app using the built-in installation deployment project.
When the installation is running however (or at the end of the process) I need it to run another .msi which I'll include in my distribution.
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Jul 13, 2009
I found an example of a simple irc client, but I'm really confused about how it sends data back to the irc server. In the example, this is the code used to respond to the server's PING request. it lies in the onDataArrival event of a sockets client:[Code]
However with this simplified code, as soon as it tries to respond to the PING request it is disconnected from the irc server with the reason "Excess Flood". So I was hoping someone could explain to me the difference between the pretty complicated method and my simplified one which doesn't work.
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Mar 28, 2006
I have a stand alone VB.Net 2005 application that uses a serial port that generally stays open while the application runs on a Windows XP system. In trying to bullet-proof the UI, I ran into a problem when the USB to Serial Converter normally used to provide the serial port is disconnected while the serial port is open. In trying to handle the resulting error when accessing the port, I find I cannot close the port.
When trying to do so, the error message says something like "unable to close the port. You may not have sufficient permissions." Reconnecting the USB/Serial Converter does not reactivate the port.
[Code]...
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Apr 2, 2012
my folder dialog windows isnt opening. its odd cause its been working for a long time.app closes soon as i click on my button
'Open Folder Dialog
Dim folderDlg As New System.Windows.Forms.FolderBrowserDialog
Dim selectedFolder As String
[code]....
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Aug 24, 2009
I was looking to launch a program, such as MS Word, by pressing a button on particular form. Is there a way for me to do this?
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Jan 27, 2011
I created an application in Visual Studio 2010 - visual basic. It works great on computer1 and computer2, but on computer3 and computer4 it crashes when its launched. It says that the program has crashed and more information can be found in 3 files named WER.But in these files i can not see an error.
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Nov 18, 2010
When I click a button to Shell something, instead of having to specify where the exe (or whatever file it might be) is, i was wondering if I could combine it with VB to make it something like this. Shell ("Internet Explorer.exe"). Also, have VB save the file so anywhere I take that single exe file i made with VB, the exe file I want to shell goes with me. So that way I can launch multiple files from just one exe file and not have any directories to worry about.
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May 15, 2010
I have a dual-monitor setup. When I launch the main program, I need to make sure that it always launches in "Screen 1". I have a button within the program that launches another fullscreen window and I need this to always launch in the next available screen (read: not covering the main program window)I am using the System.Windows.Forms.Screen class to try to accomplish this and have have had about 80% success. I can successfully test for multiple monitors (which enables the button). When they click it, I can get it to always launch in the second screen. The problem I'm encountering while testing is the main program is launching in Screen 2, so the second window covers it.
Here's what I'd like to accomplish ultimately: I would like to always launch my program in Maximized stated (and disable resizing,
minimizing/maximizing is ok, just not double-clicking titlebar to resize) in the primary monitor (where Taskbar is being displayed). Then, when the button within the program is pressed, it launches the new window in the NEXT available monitor in Maximized stated.
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Nov 19, 2010
I have a vb.net application that I compiled and all, I took the EXe and all and placed it on another pc that has only visual studio express on it.
When I open my .exe I get a message saying No debugger has been found, no Jit Debugger has been specified I can either select retry to find a debugger or click on cancel to forget about the debugger.
If I press cancel, my application launches correctly without any problem.
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