Sql Connection Error - Re-establish Connection To The Server

May 14, 2010

This will happen at random, and I can always just catch the error and re-establish connection to the server, but I am confused as to why. When doing lots of inserting into the sql server, I only establish one connection that is public, instead of many little connections. I had my doubts on a public sql connection, but it's been running great, and I've seen no problems until this morning. Again, this random moment I hit an error that stated, sql connection state is broken. Is it bad practice to just accept this error, and when it happens, re-establish the connection?

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Can't Establish A Connection To SQL Server?

Nov 15, 2011

I'm using Visual Studio 2005 and SQL Server 2000 for my vb.net desktop application..I'm having a SQL Server exception saying that "connection can't be established to the server.hen connecting to SQL Server 2005 this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. Also showing

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Establish Connection With Sql Server 2005 Database?

Sep 15, 2009

I want to know how to connect sql server 2005 to vb.net windows application

1)is there any connection string ?

2)if so i am using windows authendication in sql server 2005 management studio so am not entering any user id and

password to enter in sql server

3)so what should be the userid and password for the connection string can any one send me a sample code that i can refar

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Establish A Connection When The App Is Launched And Keep The Connection Open Until The App Is Closed?

May 20, 2010

I'm developing a device app in VB.net that will access a SQL Server database. I need to establish a connection when the app is launched, and keep the connection open until the app is closed. I've done the following:In the Master Module:

Public CNN
As SqlConnection

In the Main menu form load:

CNN =
New SqlConnection(sqlConnString)
CNN.Open()

Then when I want to read from the database:

Dim sqlDR
As SqlDataReader
SQL = "SELECT Name FROM Table"

[code]....

When I run the same code without the global CNN, but rather dim the connection inside the Select function, all works well.

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Cannot Establish Connection Using Odbc?

Jan 5, 2012

i have 2003 access database. why i cannnot connect to my database using the code below?

red
Public BioCon As New Odbc.OdbcConnection
Public GAdp As Odbc.OdbcDataAdapter
red

Public Function Execute(ByVal Qry As String, ByVal Con As Odbc.OdbcConnection) As Boolean

[Code]...

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Can't Seem To Establish A Connection Between My Two P2P Applications Over The Internet

Sep 14, 2010

I just can't seem to establish a connection between my two P2P applications over the internet(LAN works perfectly fine).

I have tried the following.
- Disabling Firewall
- Changing Port

The only way I can establish a connection is if I'm connecting to the same computer using the universal IP or the local. Does anyone have a fix for this? Oh and here is the error that I receive when trying to connect over the internet:

System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it 255.255.255.255:8787
at System.Net.Sockets.TcpClient..ctor(String hostname, Int32 port)
at P2P_Client.Form1.Msgtxt_KeyDown(Object sender, KeyEventArgs e) in C:\Users\Administrator\Documents\Visual Studio 2008\VB Projects\P2P-Client\P2P-Client\Form1.vb:line 32

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Cannot Establish Bluetooth Connection With Desktop In Vb?

Oct 15, 2010

i use vb 2008 office 2007 , it's a powerpoint add-in application. I need to use a window form as a bluetooth interface.the working procedure is like that when i click the Enum button, it will help me to search for available bluetooth devices.but now i have an error, it shows "WCL ERROR: Specified transfer is not available"

[Code]...

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Create A Program That Can Establish A SSH Connection?

Nov 28, 2011

I have being trying without success to create a program that can establish a SSH connection with [URL] on a changeable post with a set username and password. The program when done will configure IE proxy settings and establish a SSH connection to [URL] to allow the user to browse the internet without restrictions.

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Way To Establish A Connection For Use With An ADO.NET Command Object?

Sep 11, 2009

I'm designing a web service in ASP.NET and VS2008, and am using typed datasets for retrieving table data. These work well and establish their own connections through their associated TableAdapter objects. Edit: I'm using VB, BTW!I am now attempting to run a custom SQL string using a DataAdapter and a Command object, however I need to reference a Connection object in order for the Command to work. What is the best way to handle this?hould I:a) Create a global connection object using Global.asax, retrieving the connection string from web.config? (I've been trying that one already, with not much success)b) Create a class-level connection object using the InitialiseComponent method, also retrieving the ConnectionString from web.config?c) Retrieve a Connection from one of the TableAdapters that I've already created in my typed DataSets?d) Something else I haven't thought of yet?

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VS 2005 - Establish A Connection Between PC And Mobile Through IP Address

Oct 28, 2009

I want to start a new project on PC and Mobile Phone. But i'm still have so many question about the communication between PC and Mobile.

My project List:
1) My idea is establish a connection between PC and Mobile through IP address in first, but my question is 'How to do it' ? izit same like PC to PC by using Winsock open a port to access? i'm using VB.Net 2005 for PC and Net60 for mobile.

2)My mobile phone Nokia 6220 Symbian OS is support GPRS/3G. Since the GPRS/3G can connect to the internet, izit means mobile itself have a IP address and service provider in order to surf the web? So, can i connect my mobile phone to PC through this gateway?

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Sql Server - .net Program Dataadapter Connection Closes After Fill But Database Still Shows Connection?

Aug 19, 2010

After running the following sub (VS debugger), I try to detach the database in SSMS, but it shows the connection open still and won't let me detach. If I close program in debugger, the database shows no connections. I check the dataadapter's connection in the finally block and is shows closed. What gives

Private Function ClientMasterDBFiles(ByVal MasterClientDBConnection As String, ByVal DBName As String) As DataTable

[Code]...

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Establish A Connection To MySQL Via VB & Display Simple Query Results On A Form?

Dec 12, 2010

I have a project in Visual Studio 2008 and there is a working data connection to a MySQL database. In other words, I can query the db directly from Visual Studio and it will display the results.

I've tried a couple of approaches that I found online for writing a connection string and accessing the db, but no luck yet.

All I'm trying to do is code a button to query the db and then reset the text property of a label/textbox to display the results based upon another label/textbox value.

The pseudo-code I am imagining is something like this:

Private Sub query_submit_button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles query_submit_button.Click
result_textbox.Text = SELECT field FROM table WHERE otherfield = key_textbox.Text
End Sub

I didn't see any related questions posted on SO - forgive me if I missed one that already exists and this is a dupe.

What is the correct way to accomplish this?

EDIT
Using MySQL 5.1

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VS 2010 : Establish An OLEDB Connection And Return The Values From The Selected Table To A DataGridView?

Apr 16, 2010

I am unable to load the dat into the data Grid. Here is where I keep getting stuck.

dgvOleDb1 = table.Select
dgvOleDb1.DataSource = DataGridViewEditMode.EditProgrammatically
dgvOleDb1.DataSource = ds.Tables(0)

I am confused; I am using VB2010, IBM.iSeries.DB2 on an as400 V5R4. I am trying to establish an OLEDB connection, and return the values from the selected table to a DataGridView. I had one of the admin's make me file named GARBAGE, in the Rprtaccess catalog. In the past, I have been able to connect via access and an ODBC connection. My project is too big for access, and the SQL middleware we have is clunky and not user friendly. This is a program that will generate the SQL statements, specifically the WHERE: clause and populate the datagrid with the selected criteria. In essence I am making a user friendly striped down program, that has variables that are manipulated by the end user, and the rest, referenced tables and libraries are coded.

Imports System.Data.OleDb
Imports System.Exception
Public Class Form11

[code]....

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Error - ExecuteScalar Requires An Open And Available Connection - The Connection's Current State Is Closed

Aug 3, 2011

i have an application. which is executed after every 5 mins. i have an open connection but it gives me the following error:

ExecuteScalar requires an open and available Connection. The connection's current state is closed.

my code is something like this. I have shown where all i am using ExceuteScalar()

Sub Main()
Try
connection.open()
cmd.ExecuteScalar()

[code]....

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[2008] Error - Unable To Read Data From The Transport Connection: The Connection Was Closed

Mar 15, 2009

I have a simple scraper. It works on some websites, but on some there is this Error:

Quote:

IOException was unhandled Unable to read data from the transport connection: The connection was closed

It is occuring at "Dim htmlresults As String = Urlcontents.ReadToEnd()".

'Create the HttpWebRequest object
Dim req As HttpWebRequest = WebRequest.Create(URL)
'Set the timeout to 1 second (or 1,000 milliseconds)
req.Timeout = 10000

[code]....

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SQL Server Connection Error

Apr 19, 2011

This is my connection string

"Data Source=192.168.1.2,1433;Network Library=DBMSSOCN;Initial Catalog=RFX2220;User ID=sa;Password=PhhassssWord!;"
this is the error message

A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 0 - No connection could be made because the target machine actively refused it.)

(1) windows port enabled

(2) server configured for windows + sql server authentication

(3) & also enabled for TCP/IP

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SQL Server Connection Related Error

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 SQL Server 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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Error Locating Server - Vb Sql Connection String

Mar 8, 2012

I get this error when I try to connect to my database. I used the same string provided in the database explorer "Connection String"

I do not have a password on the database.

This is a local database if that makes a difference

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SQL Server 2005 Express Connection Error?

Mar 11, 2010

am working on a project and am using sql server 2005 express as my database server, the problem is i can;t connect to the sql server from any machine on my local network (windows).

Below is my connection string

con.ConnectionString = "Data Source=webserver1SQLEXPRESS;AttachDbFilename='C:POSM_DB.mdf';Integrated Security=True;Connect Timeout=30;User Instance=True;"

It works all right on the development machine but not on network, i think it has something to do with the network.

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VS 2008 - Connection To Godaddy Sql Server - Error: 40

Jun 3, 2010

I created a vb form application that I want to query a SQL Server database that is hosted through godaddy. Below I have my function that calls the db and also my connection string in my app.config file. When it tries to open the connection I get the following: {"A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)"}. Do I have to set something on the godaddy end to allow a connection? Or can I only access the database from a web page on my site? [Code]

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Error :SMTP Server Requires A Secure Connection

Feb 14, 2012

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim mail As New MailMessage

[Code]....

The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required

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SQL Exception Unhandled Error Has Occurred While Establishing A Connection To The Server

Feb 24, 2006

An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)

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Sends Data On A Networkstream Through A Tcp Connection - Error "An Established Connection Was Aborted By The Software In Your Host Machine"

Aug 18, 2009

I have a program that sends some data on a networkstream through a tcp connection.

[Code]...

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Error The SMTP Server Requires A Secure Connection Or The Client Was Not Authenticated

Feb 19, 2009

I am trying to get this program to send an email, but still no luck. I am getting the following error that I do not understand. I do not understand what I am doing wrong. Also, I may have an issue that the computer I am writing this code on and trying to send the message does not have ISS and is just windows XP home.

The error is below

System.Net.Mail.SmtpException was unhandled
Message="The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Must issue a STARTTLS command first. k41sm2133530rvb.6"

[code].....

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Import Excel Data Into SQL Server - ERROR: "ODBC --Connection To {SQL Server} Servernamesqlservername Failed"

Aug 13, 2010

I am trying to do something fairly simple.. allow my user to import thier data from Excel into SQL Server, where it can be used by the application.To do this, I'm using the fairly simple code that is common everywhere I look:

strFilePath = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fdlgFileOpen.FileName + ";Extended Properties=Excel 8.0"
connExcel = New OleDbConnection(strFilePath)
connExcel.Open()

[Code]...

Now, on my development computer this code works perfectly. The data imports, and I can go on my merry way.

On the TEST computer, this code throws the error: "ODBC -- Connection to {SQL Server} servernamesqlservername failed." This seems very odd to me, because I'm using exactly the same SQL Server and database to interact with the application, and all the other screens in the application work perfectly. The test computer CAN connect to this SQL Server, but it keeps throwing this error whenever I try import data from Excel.I've tried everything I can think of - using the server's IP address instead of the server name, sending the SQL Server administrator data along with the request, taking out the Trusted_Connection=Yes... nothing works. What is going on here? How can this code work fine on my computer, and hiccup on another?

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A Network-related Or Instance-specific Error Occurred While Establishing A Connection To SQL Server?

Aug 23, 2011

I am working on a project using VS2010 SQL2008 and I saw an ODD behaviour , First let me tell you that the app runs without any problem in my developing pc (Windows Xp sp3 32bit)But when I was trying the application in another pc (Windows 7 32bit)I got this exception: A network-related or instance-specific error occured while establishing a connection to SQL server.The server was not found or was not accessible.Verfiy that the instance name is correct and that SQl server is configured to allow remote connections.

Now what is weird in this exception; Is when the application reaches the DataAdpater.Fill(dataset) line I got this exception but when the app reaches the DataAdpter.Insert(....) It runs without any problem .

And what is more weird is that I noticed that the dataset that is used in the previous insert procedure can later be filled with dataAdapter.Fill(...) procedure which it was giving me an exception before .

I tried these things as a solution:

1)Checked SQlBrowser running..

2)No aliases to Sql server at all to remove...

3)remote area connection--OK

4)TCP and UDP port 1433,1434 exception in firewall

5)Unistalled my only antivirus Norton

6)Added Tcp/IP ports in Sql protocols

7)My connection String is : onnectionString="Data Source=ALISQLEXPRESS;Initial Catalog=PALMSDATABASE;Integrated Security=True"

8)Also tried using Sql Server authentication (user Id and password)

what is the difference between fill and insert? My app. runs smoothly on the original pc ,What should I do?

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Asp.net - A Network-related Or Instance-specific Error Occurred While Establishing A Connection To SQL Server?

Jan 19, 2011

I HOST MY ASP.NET WEBSITE ON WEBSERVER ..But after upload when i try to access my site ...

[URL]

Then following error occurs ....

A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections.

(provider: SQL Network
Interfaces, error: 26 - Error Locating
Server/Instance Specified)

i have changed my connectionstring in web.config file and all webpages to :

<connectionStrings>
<remove name="ConnectionString"/>
<add name="ConnectionString" connectionString="Data Source=69.16.253.19,1433; Network Library=DBMSSOCN; Initial Catalog=database;

[code]....

...before publishing and uploading my website to webserver ...I m confused the problem is from my local computer or the webserver ....and how to fix this error ?

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VS 2008 - A Network-related Or Instance-specific Error Occurred While Establishing A Connection To SQL Server

Nov 18, 2009

Error message receiving A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) The project is written in VB.Net 2008. Production server uses SQL 2008, Dev Server uses SQL 2000. The application has been built and published.

Prod Connection String: strCN = "server=SGMAGNCPQ03.;Initial Catalog=APO_Tax;Integrated Security=True"

Dev Connection String: strCN = "server=S04423711940995.;Initial Catalog=APO_Tax;Integrated Security=True"

The Problem: When I change the connect string from dev back to prod and try to run my app, I get the above error message. If I reboot everything works fine but if I switch the connect string from prod to dev and try to go back to prod, I'm back to the same problem.

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Connection Leaking Causing 'System.Data.SqlClient.SqlException: Timeout Expired' Error In SQL Server?

May 19, 2010

My application requires a user to log in and allows them to edit a list of things. However, it seems that if the same user always logs in and out and edits the list, this user will run into a "System.Data.SqlClient.SqlException: Timeout expired." error. I've read a comment about it possibly caused by uncommitted transactions. And I do have one going in the application.

[Code]...

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Error Login Failed For User ''. The User Is Not Associated With A Trusted Sql Server Connection

Oct 2, 2008

Dim sqlConn As New SqlConnection("Server=.\SQLEXPRESS;uid=;pwd=;database=ContactManager")
sqlConn.Open()

Above is my connection string, The programs runs up until sqlConn.Open() and then i get the same error, using no UID and Pass, or using a uid and pass.

Login Failed For User ''. The user is not associated with a trusted sql server connection

I have the SQL Servers authentication se to Windows Authentication and SQL Authentication. I'm using Visual Studio 2005 and SQL Server 2005.

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