I created a datasource using the wizard, previewed the data, and everything looks good, all of the data is showing up. I attempt to use the fill method on the built in datagrid control, and it times out telling me
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: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
Source=.Net SqlClient Data Provider
How can i preview the data, but then all of the sudden when the application actually starts, i cant access the server at all?
I was compiling and running my project from a mapped network drive, and i tried EVERYTHING i had permissions to try to fix this, including checking all of our production SQL server's settings. i tried every connection client, including linking the table in an access database and trying to connect to the table that way, and nothing. Every other application from access to excel to SSMS to visual studio itself could connect, just not my built application. Then i tried moving my project to my physical drive on a whim and all of the sudden, it had no connection issues.
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I have a program with a dataset on a windows form program that connect to a database. On the deployed server everything works ok. Then I added a table to the sql table and to the same dataset that worked in the past. It works on my local machine, but on the deployed machine it does not work. I had this problem once before and when I added a table to the dataset it added a hard coded path to the database. I've checked for this and this is not the problem. Anybody know what else I can check.
The program give the following error when opening the new table,
System.Data.SqlClient.SqlException (0x80131904): 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) --->
I have two connections strings in my program. One for the local server and one for the deployed server. I simply add or remove the one for "ClubConnectionString1" in my app.config file on the deployed machine. When I added the table in the dataset it choice the wrong one, and therefore when deployed it couldn't connect.
To fix the problem I manually searched for "ClubConnectionString1" in the clubdata.Designer.cs of the clubdata.xsd file, and removed the 1 from ClubConnectionString1. That fixed the problem.
Was going about with our usual deployment of code (ASP.NET MVC solution) to Azure to a test instance as an App service. The solution works on local machine, but started throwing this exception in Azure.
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)"
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
* SQLExpress database file auto-creation error: *
Unfortunately this seems to be happening even for other environments now. I haven't changed anything there except redeploying. This has nothing to do with connectionString, have triple checked it on the server itself. Basically the solution as it is works, and have been working for all this while, but since last week all new deployments are failing with this error. Even re-deploying the old code seems to fail. I am afraid to try it on any new environments.
No recent changes were made to web.config, all that was updated was some UI components. In any case, even the older code that is running on other environments are failing. Any ideas on why this could be happening?
SQLExpress only exists within Visual Studio. On something like Azure, you need a connection string that points to a real instance of a SQL Server database.
I need help with SQL server in visual studio. I can't seem to connect my visual studio with internal SQL server. I had created a database with visual studio earlier and it was working fine but now i'm getting an error saying:
The attempt to attach to the database failed with the following
information: 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: 50 - Local Database Runtime
error occurred. Cannot create an automatic instance. See the Windows
Application event log for error details.
I have tried to create a new database file in a new project but then i get the error:
A network related or instance specific error occurred while
establishing a connection. The server was not found or was not
accessible. (Provider:Named Pipes Provider, error:40- could not open a
connection to SQL server.
I have tried different things but can't seem to get the hang of the problem. I reinstalled visual studio too but that didn't work either. what can i do to get rid of this error and get my database back online?
If you are running Visual Studio on your local machine, you have not any problem with firewalls and enabling of TCP/IP.
Try this four solutions may fix your problem:
SQL Server Express LocalDB add-on, get it from this link.
Make sure that your SQL service is running.
Use SQL Server Authentication.
Make sure you have typed .\sqlexpress in Server name in Add Connection window. You should use a backslash \ as the separator, not a forward slash.
First off, I only have a very basic understanding of SQL. I can create tables etc. but configuration is beyond me. I am running my web site with MVC3 ASP.Net on a windows 2008 server using SQL Express.
Everything works fine, my connection strings are correct, I can use the website and it reads and writes to the dB, I can also view the dB with management studio on the server.
Today I got the following error:
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)
When I tried to log on to the database in management studio on the server I get a similar error. the only fix I have found is for a server restart. The database was down for 6 hours before I noticed which is not good for a start up website.
Has any one seen this issue before? Is this an express issue? Any help or advice would be great.
Troubleshoot as you would any network error. Start with the server's event logs.
As for notification of downtime, there are a lot of web services that will monitor your web site and email or send you an SMS message if it's not responding. Two that I've used are uptimerobot.com and basicstate.com. There are dozens of others.
You could also rewrite your ASP.Net app to email or text you when certain kinds of errors happen.
I have prepared a program with Visual Basic 2010 and I am using a SQL Server 2008 database. (service based database) it works properly. But sometimes (when I don't use computer for a period like 2 hours) I try to start my program on VB (F5), it waits, and then gives this error:
A network-related or instance-specific error occured while
establishing a connection to SQL Server. The server was not found or
is not accesible. Verify that the instance name is correct and that
SQL Server name is configured to allow remote connections. (provider:
SQL Network Interfaces, error: 26 - Error Locating Server/Instance
Specified.)
I have googled it, but nothing helps. I'm afraid this error will be a problem when the user uses the program. How might I solve this?
Probably the network connection turn off after some time. Check System Operating power setting's option
The same issue I faced and got resolved by trying this - in run type services.msc:
the services window will pop up
in that SQL Server(SQLEXPRESS) start this service.
make sure SQL Browser service is running.