Just wondering if anyone has run into this before. Had a few devs look at this, and none of us can figure it out.
I have an ASP.NET Web Forms app connecting to a Sql Server db via an alias using EF4. The alias is set to point to my machine name (not "." or "local"). When I run it out of VS2012, it works fine. If I deploy it to my local instance of IIS7 and try to pull it up in a browser, I get the 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: Named
Pipes Provider, error: 40 - Could not open a connection to SQL Server)
My connection string looks like this:
Data Source=aliasName;Initial Catalog=databaseName;Integrated Security=True;MultipleActiveResultSets=True
If I change the connection string so that the Data Source is my machine name instead of the alias, it works fine from IIS7. So, the problem appears to be something with the alias and only when running out of IIS7.
As a workaround, I am using a local build profile to deploy a different web.config that doesn't use the alias locally, but I would really like to figure out why it's not working.
Any advice would be appreciated.
Check this, specifically:
Pre-requisites for SQL Server Alias usage
You must be willing for your clients to connect to the instance via a network protocol. It is not possible to use shared memory connections that are available when the client and instance are on the same system. I use TCP/IP connections for my aliases.
On the system hosting the SQL Server instance you must have the SQL Server Browser service running (this is normally has Start Mode set to Automatic).
On a 64-bit system, if you have both 32-bit and 64-bit clients, you will need to create an alias for BOTH 32-bit and 64-bit clients.
Related
EDIT: One important detail that I original left out (because I didn't know it was important) is that we were running these sites in full IIS, not from IIS Express.
We're trying to setup local dev environments for Kentico CMS that will add our local machines to our current synchronization chain of Dev --> Staging --> Prod (so we'll wind up with Locals --> Dev --> Staging --> Prod).
We copied our Dev DB to our local machines onto the (localdb)\v11.0 instance of SQL Server, but we're running into an issue on everyone's computers except mine.
Here's the error we're getting:
The application could not connect to the database, please check the
connection string in the web.config file and SQL server availability.
Original 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: 50 - Local Database Runtime error occurred.
The specified LocalDB instance does not exist. )
I've tried a ton of suggestions from other SO answers and other websites to figure out why we're getting this error (and why it's not happening on my machine), but no luck. We can connect to (localdb)\v11.0 in SSMS but we cannot connect to it through VS (same error). Also, when we open Sql Server Config Manager, we're not seeing any listings for SQL Server Services. Any ideas?
Make sure you have .NET Framework 4.0.2+ installed
Set up your AppPool to run under the NetworkService account.
Create a login for that account in your db.
USE [master];
CREATE LOGIN [NT AUTHORITY\NETWORK SERVICE] FROM WINDOWS;
EXEC sp_addsrvrolemember N'NT AUTHORITY\NETWORK SERVICE', SYSADMIN;
Share your instance with all users by running
SqlLocalDB share Kentico KenticoShared
Use connection string in the following format:
<add name="CMSConnectionString" connectionString="Data Source=(localdb)\.\KenticoShared;Initial Catalog=KenticoDB;Integrated Security=True;Connect Timeout=60" />
If it doesn't help use a named pipe:
<add key="CMSConnectionString" value="Persist Security Info=False;Integrated Security=SSPI;database=KenticoDB;server=np:\\.\pipe\LOCALDB#D2BA6590\tsql\query;Current Language=English;Connection Timeout=120;" />
Notes:
the exact name of the NetworkService account on your machine can be determined by running following C#
var ns = new SecurityIdentifier(WellKnownSidType.NetworkServiceSid, null).Translate(typeof(NTAccount)).ToString()
named pipe can be determined by running this in CMD: SqlLocalDB info KenticoShared
don't forget to run your instance SqlLocalDB start KenticoShared
Seems a little obscure, but have you looked at http://support.microsoft.com/kb/941823 , "Some or all SQL Server 2005 services are not listed in SQL Server Configuration Manager..."?
And there are generally two things that get in the way of connecting to SQL Server from an application even though you can connect using Management Studio. First, you should make sure that TCP is enabled on the instance, http://msdn.microsoft.com/en-us/library/bb909712(v=vs.90).aspx . Second, since you're connecting to a named instance, which I'm assuming is not the default instance running on the standard port, you need to make sure that the SQL Server Browser service is running, http://technet.microsoft.com/en-us/library/ms165734(v=sql.90).aspx . This is what redirects applications to a non standard port without having to specify the port directly. The reason Management Studio can get past these is that it can connect through named pipes and skip TCP altogether.
See this post as this solved my problem:
These two posts on Using LocalDB with Full IIS should give you more information. Especially the second part seems relevant, but the first one contains some context as well.
Part 1: User Profile
Part 2: Instance Ownership
Credit: IIS connecting to LocalDB
I was developing, and recompiled started my website with ctrl+F5 and got 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)
How can this even happen?
I didn't changed anything.
I started empty MVC application and start it with CTRL+F5 and it works. I restart my main app, and still doesn't work. Damn.
Problem is, that I didn't change any connection string, anything in mssql server, didn't restart anything. I just compiled application like usual, and it said something about Antlr3 first, then couldn't connect to server anymore.. Changed the port for sql express and it started to work for a 20 minutes, and stopped working again.. don't understand.
this error threw for two type of problem .
1) Check your connection string for correct server Name and database Name ,etc..
Examble : Setting up connection string in ASP.NET to SQL SERVER
2) Check your sqlserver for open , if your sql server is there is any another system , please check your local network and another system network .
Please see this solution
Connect your SQL server from Visual studio > View > server Explorer,test and copy the connection string from there.It will work...My guess is you have a wrong connection string with wrong instance..
Is your database can be accessed outside the network. I think you need to add SQL server to firefall application to access it outside.
To add the sqlservr.exe to windows firefall
1. Go to Control Panel\System and Security\Windows Firewall\Allowed Programs.
2. Click Allow another Program.
3. Add SQL Server
Go to Control Panel -> Administrative Tools -> Services -> SQLServer . Check SQLServer to make sure it is started.
I forgot to put [InitializeMembership] attribute in my HomeController.cs, and it was looping forever because I was using RolesMembership ;)
What is the problem below?
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)
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.
Exception Details: System.Data.SqlClient.SqlException: 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)
How can this be solved?
All Programs >> Microsoft SQL Server 2008 >> Configuration Tools >> SQL Server Configuration Manager >> SQL Server Services, and check if SQL Server service status is “Running”.
Seeing as this result is second in Google when searching for:
Server is not found or not accessible
I'll add to this post. Colleague of mine has search for an entire day on this problem, checking his connection string and double checking his code. He could connect to the server using SQL but his application wouldn't connect.
Turns out he was running his application from a network share. Network shares only have partial trust and will produce this misleading exception as a result.
Move the project to your local drive and try again. Hope this helps someone!
We were getting this intermittently on our .NET website which accesses an SQL Server database on another server. I tried several things, including making sure I was closing all SQLConnections and recycling applications pools more frequently. These helped some but the problem still occurred from time to time. What it turned out to be was a DNS issue.
I resolved it by changing the connection string Data Source value from a domain name to an IP address, e.g from:
Data Source=My-SQL-Server;Initial Catalog=database-name;Integrated Security=true
to
Data Source=10.1.2.237;Initial Catalog=database-name;Integrated Security=true
This means pretty much exactly what it says. For some reason the computer the code was running on could not communicate with the SQL Server. This could be caused by a lot of things: Firewall issues, DNS/Name resolution, SQL Configuration (not configured to accept TCP/IP connection). Just to name a few.
You need to restart the MS SQL service. Please follow these steps:
1- Press window sign + R to open Run Window.
2- Type services.msc and press Enter.
3- Look for SQLSERVER(MSSQLSERVER) in the services list.
4- Right click on that service and choose REFRESH or START.
Hopefully it works.
Just go through following steps:
All Programs
Microsoft SQL Server 2008 R2
Configuration Tool
SQL Server Configuration Manager
A pop up will open click on yes.
Select Sql Server Services (At left side) and Make sure status is running for all services (At right Side)
One thing you can try is to open server explorer in Visual Studio.
Click Connect to database.
The datasource will be Microsoft SQL Server Database file. Click ok
Type in the Database file name or click Browse...
Click Test Connection and make sure it works.
If it does...click on the Advanced.. button.
Copy the Data Source text at the botton of the screen.
Almost everytime I see this error I was trying to use an instance name something like "long_pc_name/MSSQLExpress" (this is what shows up in MSSMS)
And every time it just needs to be "(LocalDB)\MSSQLLocalDB".
If your connection string is pointing to a local db...
connectionString="Data Source=(localdb)\
Server=localhost\SQLEXPRESS;Database=
Another cause of this error is: you might not have Sql Server installed in your system.
Download Sql Server Express here:
https://www.microsoft.com/en-us/download/details.aspx?id=55994
Install it and try again.
You can use this connection string to connect to it:
Server=localhost\SQLEXPRESS;Database=master;Trusted_Connection=True;
Your local server name is localhost\SQLEXPRESS.
Replace database with your database name.
Refer to this post if you still have trouble connecting:
Why am I getting "Cannot Connect to Server - A network-related or instance-specific error"?
I was trying to run the MVC Movie tutorial but I had the error in question. So I created a new MVC project and copied its connection string and used that to replace the one in the tutorial. Basically, replace this:
Data Source=(LocalDB)\v11.0
With this:
Data Source=(LocalDb)\MSSQLLocalDB
For all connectionString properties.
Go to SSMS and check if the SQL server is accessible there.
Try to replace domain name by IP address. Check if you have sufficient authorization,and other requirements fulfilled.
Try to check LAN connection and VPN connection, if required.
We are upgrading from an environment where the development web server, the SQL Server 2005, and SQL Server data are all on the same machine, a Windows XP Machine. We are upgrading to having the web server on one Windows 2008 server, the SQL Server on a 2nd Windows 2008 Server, and to Server to a Windows 2008 server, nd the data on a SAN.
Now we are getting the error message:
A connection was succesfully established with the server, but then
an error occured during the login
process. (provider: named pipes
provider, error 0, no process is on
the other end of the pipe.)
The network guy thinks it is a problem with the connection string:
<add name="CNString"
connectionString="Data Source=WEBSERVER;
Initial Catalog=PCIdb;
User ID=sa;Password=pass;"
providerName="System.Data.SqlClient"/>
Can anyone help out here?
Is your SQL Server really called WEBSERVER (DataSource="WEBSERVER") ??
Also, I would never EVER use the sa account in a connection string - NEVER, period. Use an application specific user or something, but do not use the sa account under any circumstances.
This can be caused by any number of reasons, but the first thing to look at is the configuration and setup of the SQL Server itself.
Are named pipes enabled on the server? You can check this through the server configuration manager (on the SQL Server machine itself).
Is the user on the connection string (or the connection pool user if you are using SSPI) setup on the server?
Note:
I do hope the connection string you put up is an edited version of your real one, as there are a couple of issues with it:
Using the sa login - you should never do that as now any SQL exploit can do any damage it wants
Calling a sql server "webserver" - a really confusion naming decision
When it comes to connection strings, look at connectionstrings.com - they hold a good list of valid connection strings to many databases using different providers.
I got that error before...Make sure SQL server services are started
If that's not it, change the authentication mode to both server and windows.
It could be a connectionstring problem. Try comparing your connectionstring to the connectionstrings at http://www.connectionstrings.com but it could also be that the remote connection or the remote server (the webserver in this case) isn't allowed to connect to SQL.
Check if remote connections are allowed and named pipes and/or TCP/IP protocols are enabled on the database server.
But, based on the scenario you've described, I'd say it's the database-end that's refusing the connection (since you've already had a working solution).
I can neither login from my application nor connect using the wizard to my Membership Provider on my local machine. My other DBs can connect from my application just fine. My connection string is correct, it has not been changed (I was able to login using membership previously, this is a new issue).
I created a new App to see if it could be the config, threw a login on it and registered and ran into the same issue.
This is the error message I am getting: "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) "
Though my other DB can connect I still checked:
TCP/IP enabled
Multiple connections enabled
Firewall down
Correct instance of sql server being referred to in Machine config.
Also, my network service account has rights to the DB, but should there be an ASPNET user?
I can't think of a single thing I have changed to this machine since this was working previously.
Thank you.
EDIT DETAILS: There are no aliases, yet, but if my other connections are working that shouldn't be the issue. I understand these things can be wonky though, so that's something I'm going to try now. Thanks. I will also try and take a look at what's going on while trying to connect. Best way: event logs?
I am using Windows Auth, I'm connecting locally, using Windows 7 and SQL Server 2008 along with VS 2008. I can connect with Management Studio and query the DB, yes. NetworkService account has rights to the DB.
Check the Server name in the connection-string if the Sql-Server is in the same machine with the web application use "."(dot) without quotes instead of the computer-name in your connection string.
Have you tried sniffing it to see if there's anything you can see on the wire when the connection attempt is made?
Are there any aliases around the server/DB name? Have you tried creating one and connecting to it?
Are the other instances you can connect to on the same machine? Same SQL Server instance?
If you use impersonation, does the problem go away?
It sounds like you can connect to one database, but not the one you need. Is that correct?
The ASPNET user is a Windows XP thing. You should generally use NETWORK SERVICE for server-based deployments.
So, you can connect from Management Studio, but not from IIS? What identity are you using for the IIS AppPool?
Can you connect if you use Cassini (the web server that comes with Visual Studio)? That should pass through your user ID.