Communicating With Remote Host & Port?
Oct 1, 2009
I've been trying for a long time to do what seems to be the most simplest of things..I have a remote host and I need to know if certain posts on that host are open or closed.Many examples on the net that I have found arent complete, and because I havent worked with VB.net for long I dont knowhow to complete them.Here is my code:: The issue is with this it tell me the target port is always closed, when I know that it is open.Code:Dim host As String = "www.google.com" Dim port As Integer = 80 Dim addr As IPAddress =CType(Dns.GetHostAddresses(host)(0), IPAddress) Try Dim tcpList As New TcpListener(addr, port)tcpList.Start() Catch sx As SocketException MessageBox.Show("port is closed") End TryA friend of mine suggested using WinSock.. I've not dealt with it before so I don't know what he's on about.
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Jan 20, 2010
Rather than use an Entry name of an existing VPN connection, is it possible to connect to a remote network by creating a temporary connection on the fly by using the remote IP/Host name, username and password?
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Feb 19, 2010
I am communicating to a device using a USB to serial port (VCP). I am having a problem with the usb failing. When the usb fails my app will lock up and the com port is lost. I have seen a post about this but cannot find it.
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Sep 30, 2009
How can I set a host IP address and port.. and then detect if the port is open (accepting connections)or closed (denying connections)I came across this while searching, but it doesn't seem to function all that well..Using the port 80 and the host [URL] The result it gave me was closed... which is obviously wrong.So what can I do?Code: ( I have also imported "System.Net" and "System.Net.Sockets" )
Dim host As String = "www.google.com"
Dim port As Integer = 80
Dim addr As IPAddress = CType(Dns.GetHostAddresses(host)(0), IPAddress)
[code]....
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Jul 6, 2010
Does someone know what api funtion to use for getting remote host name right now i use System.Net.Dns.GetHostName and the nbtstat -a function, but still have some computers that i dont get their host name but i do get their mac with send arp...so how cna i get their host names with an API call..
This is my code for dns.hostname ..
vb.net Dim myIPs3 As System.Net.IPHostEntry = Dns.GetHostEntry(hello)
Dim newhost3 As String = myIPs3.HostName
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Sep 9, 2009
When I to connect to remote host to retrieve sql record...
it execute to few minute will get his error message... but there is already work perfectly and get connected... it loop it a few record only will occur this error...
"Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host."
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May 19, 2010
I have a fat VB.NET Winform client that is using the an old asmx style web service. Very often, when I perform query that takes a while or pass a large amt of data to a web service in a dataset, I get the subject error.The error seems to occur in < 1 min, which is far less than the web service timeout value that I have set or the timeout value on the ADO Command object that is performing the query within the web server.It seems to occur whenever I am performing a large query that expects to return a lot of rows or when I am sending up a large amount of data to the web service. For example, it just occurred when I was passing a large dataset to the web server:System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a receive. ---> System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. ---> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the rem
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Sep 19, 2011
I have an application that copies a file from a network/internet location. I am trying to catch the exception for when the network connection becomes unavailable (or internet goes down). Currently i catch the exception "Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host." which occurs on the bold, underline line below.The issue i have is i try and attempt the operation to continue doing what it was doing by resetting variables and then reassigning them to continue reading the stream but cant get past this error. The only way to go past it is to stop and start the application which is not what im after. [code]
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May 24, 2012
I want to restore an simple .SQL file,
The MySQL Server is Protected with password and is an remote Host
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Aug 15, 2010
What would be the most quickest way to edit a text file on a remote host?
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Nov 19, 2009
I have created a Windows service that runs on one of our servers. The service lisens to incoming connections on a set socket port, runs a series of WMI queries on the requested computer in a new thread (the socket accepts a string value as input which is the hostname to scan), creates an xml file based on the collected data, and posts it back to a webserver. This works perfectly on all WMI queries, but i have one function that gets all installed software from the requested host using the RegistryKey.OpenRemoteBaseKey method to get all keys from the "SOFTWAREMicrosoftWindowsCurrentVersionUninstall" key on the target host. If the the target machine OS is Window Vista or 7, it returns no values. If i run this code on the target machine it works, but not from the service on a server. The service is installed and runs with full domain administrator rights. I guess this is a permission issue, but i have not found a good solution on how to solve it on the internet. As a workaround i use WMI to get a list of installed software from computers running Vista or 7. The problem with the WMI method is that it's very slow. It takes 10 - 15 seconds just to loop thru all ManagementObjects in the Querycollection. Maybe i could filter the WMI query better before starting the loop ?
[code]...
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May 19, 2012
Below error is thrown in a already opened program which connects to different database
A transport-level error has occurred when sending the request to the server.
(provider: TCP Provider, error: 0 - An existing connection was forcibly closed by the remote host.)
Program details: code done using vb.net with MSSQL 2008 as back-end
Two instance of same exe where running simultaneously in same PC but error was thrown only by one instance Program uses both sqlconnection(ADO.NET) and ADODB connection(upgraded from VB6) and the error is thrown by both types of connection. If the error is due to network problem with the server then why few programs work fine? I am not able to trace the reason for this behavior of the program. Can I know why this error occurs and why only in few programs of same instance.
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Oct 23, 2009
way to retrieve list/rename hiddne files from the remote host. I need to upload the file to a server and then move it to another directory, but the file after being transfered becomes hidden. If I try to rename it any way I get the dreaded 550 in response. I would hate to move to commad line scripting which at the moment seams to be my only option.
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Aug 5, 2011
I have a tcp server that uses TCPListener and the async method BeginAcceptTCPClient:
Imports System.Net.Sockets
Imports System.Threading
Imports System.Net
Public Class TCPServer
[Code]...
My problem is that infrequently, I get an exception in the HandleAsyncConnection method:"An existing connection was forcibly closed by the remote host" right at the EndAcceptTCPClient method. At this point, the TCPListener seems to stop listening. The problem is that I can't test this easily, as it only happens on a remote test VM and only once every 24 hours or so. If I knew how to recreate the error with a test client, I would be able to figure this out. Wireshark shows a reset [RST] packet being sent at around the time of the exception. So I either need to know how to handle the exception, or how to recreate the problem with a test client.
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Aug 15, 2009
i want to access com port of my remote pc. this pc is connected through LAN.how can i access com port of remote pc?
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Jun 22, 2010
I have different computers, lets say 200 cps with all known mac address. i got 3 switches with 24 ports each. i want to know if i can be able to know the port No. and switch of a given computer given the mac address. some computer aren't in the domain. how could i start putting this into code.
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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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May 25, 2010
ok i got a hard question I have diferent computers, lets say 200 cps with all known mac address.
i got 3 switches with 24 ports each. i want to know if i can be able to know the port No. and switch of a given computer given the mac address.some computer arent in the domain.
how could i start puttin this into code
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Oct 10, 2009
Our company has setup several remote devices that link to a switch Whenever there are problems on the device, some technicans will replace it using a new one We have a vb program that can automatically update the device setup in our server when technicans replace devices. So we do not need to login and update the setting manually However, our program cannot handle the case that there are more than 1 device that need replacement Therefore, our idea is to retrieve the ip and port of the router/switch that links to remote device using VB.net.
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Apr 24, 2011
I am working on an app that searches my network and retrieves ips and host names, but when using this.[code]
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Jan 3, 2011
I want to code an app with recreational purposes. This should be a Desktop app that detects itself running on other computers on the same LAN and communicates with them. By communication I mean that I should be able to pass anything from on to another. note that although I'm not asking for code (that would beat my purpose, of course) I think some small snippets wouldn't hurt. In any case what I really want is the "recommended procedure", I mean what Microsoft recommends for this environment, and documentation :)
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Feb 3, 2009
is there a way through vb visual express 08 to ask a printer if it has toner or paper? im not to sure on how to communicate with printers in this way if it is at all possible.i am writing a program to display the status of the printer and this is key.
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Mar 8, 2012
I've set up this function in my web app to send push notifications to Android devices:
Private Function SendNotification(ByVal authstring As String) As String
Dim request As WebRequest = WebRequest.Create("https://android.apis.google.com/c2dm/send")
request.Method = "POST"
[code]....
However, whenever I call this function, I get the following error message: The remote certificate is invalid according to the validation procedure."
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Jul 25, 2009
I have VB.net Simple application with form1.vb , UserControl1.vb and a simple Dataset with few records included. In my UserControl1.vb I'll added a Bound DataGridView1 with Products Datasource. My question is.. How can i filter the Products table from UserControl1.vb? The Filter Value ("ProdID") is from Form1.vb with textbox1(receive the value.). here is my Form1 code
[Code]...
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Feb 15, 2011
Im new to using databases in my programming and to be honeest i am struggling.i need to get the program to communicate with my database to allow the user to login this is the code i have so far as i say i dont know much about it so its a bit bodged.
[Code]...
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Aug 20, 2009
Alright today im going to make a chat program in C++ and VB.net VB.net will be the server and C++ will be the chat room. Im doing this becuase some people dont have .net and the program fails so im trying this so then everyone can use it. How would i do this? Like C++ sending information to VB.net and printing it out on a textbox
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Aug 8, 2011
I need to communicate between multiple applications (one server and multiple clients) in the LAN. While googling I came across 3 concepts (TCP/IP, Named Pipes and WCF). I also understand WCF needs lot of study for a starter like me. I need to have one (server) application running on one machine, the values generated by it should be displayed immediately on the other (client) application which will be running on multiple machines in a LAN. Also when the user pauses the process from the client application, it should pause the process on the server application.
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Mar 9, 2009
I have an application which the user can open multiple instances on the same machine. However, a section of the app would have sync problems if more than 1 instance has control over it. This is where I thought of transferring control, or sharing, between them. What should I be looking into?
They would have to be able to identify which one of them has control and to send text information over. I thought IPC or Named Pipes could do the trick, but I'm unfamiliar with them and examples seem to indicate only a single server will work. Here, I have multiple instances of the same app and every one of them needs to be able to listen for that request for control.
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Sep 23, 2011
I have a Delphi program that communicates with a vb.net dll that I created. The vb.net dll communicates with a Fluke scope meter via an RS232 connection. I have created a program that communicates correctly via RS232, giving me the anticipated value. Though, when I package this up as a dll and access the dll from my Delphi program I always receive a value of "1", rather than the value I was expecting (most cases a value in and around 240).I know that my delphi program is definitely communicating correctly with the dll and that my dll is definitely communicating with the scope meter
Here is my vb.net code:
Public Interface IFlukeComm
Function GetReading(ByVal Command As String, ByVal PortNum As Integer) As String
[code].....
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Jan 10, 2011
I have a project in VB .net 2008 and would like to communicate with a Sharepoint site on our companies SP server. Is it possible to interact with the SP site such as:
Create sub-folder
Upload and download files
Change authority levels on folders
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