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Cannot Connect to Server - A network-related or instance-specific error
(54 answers)
Closed 6 years ago.
Got a 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)
Trying to populate the screen with a list of Products.
The bug
It’s reading the connection string ok otherwise it would tell us. It’s configured to except remote connections.
This document claims to have an exhaustive log of troubleshooting steps. Every step we take below this link is related to it. We’re using SQL Server 2014. http://social.technet.microsoft.com/wiki/contents/articles/2102.how-to-troubleshoot-connecting-to-the-sql-server-database-engine.aspx
It didn’t help. I did everything.
Enabled remote connections.
I used ipconfig as admin in console to verify IP address and pinged
all of them and my computer with the ping command.
They all reported ok. Tested connecting to sql server from visual
studio using as example “tcp:ipv4/myInstance.” Which was read ok.
Reinstalled SQL Server 2014. Nothing.
I reinstalled the whole OS. Didn’t work.
If you require more explicit infomation please ask me, I'll give as much detail as I can.
If you are sure that the specified instance name is correct you can check the following in the Sql Server Configuration Manager:
Firstly, check under protocols in the nodes on the left:
And make sure that both TCP/IP and Named Pipes are enabled.
If this is disabled on any of these nodes connections to the SQL server will fail.
Also under SQL server Services, make sure the browser service is enabled.
Also, is the server and the pc you are connecting from the same pc?
Related
Okay, I am at a complete loss. I have set up a SQL server & database through Azure and have been trying to connect in Visual Studio. The database is listed under Azure in the Server Explorer in Visual Studio, but, when I try to open it in SQL Server Explorer, I get the following error when I try to connect:
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 - A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.) (Microsoft SQL Server, Error: 10060)
I do not know what else to do. I have opened up port 1433 on my local firewall and allowed access from my computer's IP through the SQL Server's firewall. I temporarily opened it to all ip addresses, which did not work. The SQL Azure says the database is online. Is there an extra step or fix that I missed?
Connecting to your SQL Database would require you to allow it to be accessible from your IP first.
Please check this MS doc about how to do so.
By default Azure SQL DBs are exposed over the internet just with a simple username/password. Connecting from outside of Azure requires white-listing your IP.
The very simple way to do so is to connect using SQL Management Studio, which detects that and allows you to add you IP address automatically to the firewall rules. Have a look here to see how this works.
Update to include comments:
If none of this works, your problem probably has to do with from where you are trying to access it.
If you are behind a company firewall, there could be rules prohibiting connecting to certain port ranges. Try to connect from a wifi hotspot over your mobile phone is the quickest way to figure out.
I've been trying to view deployed reports in SSRS using Visual Studio 2015 and SQL Server 2014, but this is the error message I've been 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: SQL Network Interfaces, error: 50 - Local Database Runtime error occurred. The specified LocalDB instance does not exist. )
This is what my connection string looks like:
Data Source=(localdb)\VIRAJ-PC;Initial Catalog=AdventureWorks2012
I've done numerous things to troubleshoot this problem including editing the firewall settings to open ports 1433 and 1434 that need to be accessed, made sure that the MSSQLSERVER service was running, configured the local server to allow incoming connections, have turned on TCP/IP and Named Pipes protocols through the configuration manager, and have checked to see if the LocalDB instance is running through sqllocaldb.exe in the command line (it is running).
If it matters at all, I'm using SQL Server Management Studio 2016. I don't want to have to do an uninstall as I've done so two or three times already because of previous errors and have gone through a lot of configuration so if there's a way to fix this without having to just reinstall, I would appreciate it.
I'm having trouble connecting to a freshly installed instance of SQL Server 2014 Express. I'm not even totally sure what information you would need to help, so please bear with me as I'm very much an amateur. If I can provide anymore information to help, I'd be glad to.
The error I get is always the same,
"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 server currently running SQL Server 2014 Express is Windows Server 2008 R2, with all patches sent out by Microsoft. This is a personal server at my home, so I can do whatever needs to be done with it to make this work.
To connect, I've tried using Visual Studio Community 2013, as well as the System.Data.SqlClient namespace in C# and in PowerShell.
I've made sure it isn't the firewall causing the problem. I set the rules properly, and when it still didn't work, I turned the firewall off completely. Same issue, no connection.
Here are a few examples of connection strings I've tried in .NET. I've removed the server, instance, userid, and password from these strings, and I'm sure I have those correct
Data Source=SERVERNAME\INSTANCENAME;Initial Catalog=Requests;Integrated Security=False;User ID=USERID;Password=PASSWORD
Data Source=SERVERNAME;Initial Catalog=Requests;Integrated Security=False;User ID=USERID;Password=PASSWORD
Server=SERVERNAME\INSTANCENAME; Database=DATABASE; User ID=USERID; Password=PASSWORD
Server=SERVERNAME; Database=DATABASE; User ID=USERID; Password=PASSWORD
If anyone has the time and patience to help a newbie sort this out, I'd really appreciate it. I'm using this setup to teach myself some SQL and ASP.NET MVC 5 development, and having a minilab at home would be awesome.
Thank you for your time.
First off, open services.msc and scroll down to SQL Server, and ensure its started.
If its not running modify to start automatically, and then start it.
Once it's running, close services panel, and run ssms.exe (management studio) and try connecting to Server Name: <machinename> or Server Name: <machinename\sql2014> [no <>]. You can also click the Server Name drop down list, and select BROWSE to see if your instance is listed - although I find this hit and miss.
Once you confirm its active and you are connected, follow this msdn page and follow the steps to enable tcp/ip connections.
From there you should have the details necessary to alter your connection string.
SQL Server Express does not have TCP/IP connections enabled by default, instead it uses Shared Memory which means that external/remote connections from another computer won't work.
Open SQL Server Configuration Manager (it's on your Start Menu) and choose Server configuration and enable TCP/IP. Also open the properties for TCP/IP and ensure you have both "Active" and "Enabled" set to True on the bindings you want to use.
I had a similar issue with a C# connection string that was no longer working after we migrated from SQL Server 2008 R2 on a Windows 2008 R2 Server to SQL Server 2014 on a Windows 2012 R2 Server.
I opened SQL Server Configuration Manager and Enabled Named Pipes, restarted the SQL Server and all was right with the world (at least for a few minutes!)
Make sure that your username and password are correct in case of Server Authentication mode.
Go to Sqlserver Management Configuration and start SQL server services if any are in stop mode.
I'm seeing the following error when attempting to open a DB connection from within my C# application. I realize this error has probably shown up on 100's of questions before. However, in this scenario the error is only showing up on C# apps running on my specific desktop PC. I've scoured the internet via Google and within this website, but I can't find a solution.
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)"
WHY THIS SCENARIO IS UNIQUE:
I am able to connect to the SQL server from SQL Server Management Studio (SSMS). This application works on another computer and is able to establish a connection to the SQL server from there. So this error scenario is specific to C# applications running on my specific desktop PC. Other apps work (SSMS). Other PC's work.
When I "sniff the wire" using WireShark, the trace shows me that my app is trying to connect via NamedPipes (i.e. \Server\IPC$). I can't seem to force it to use TCP/IP.
THINGS I'VE TRIED:
Re-installed.NET Framework
Re-installed Visual Studio (C# - Express version 2010)
Created an alias within cliconfg.exe.
Is there something I missed?
Here are Connection Strings I've tried...
Data Source=<servername>;Initial Catalog=HIE;Integrated Security=true
Server=tcp:10.240.11.81;Integrated Security=SSPI; database=HIE
Data Source=10.240.11.81,1433;Network Library=DBMSSOCN;Initial Catalog=HIE;User ID=<SqlUserIdThatISetUpAsSysAdmin>;Password=<password>
Here's the code snippet:
_conn = new SqlConnection(); // _conn declared globally
_conn.ConnectionString = <the connection string above>;
_conn.Open();
The most likely scenario is that Windows Firewall is block the SQL Server communication. From MSDN (an article about named pipes, but relevant nonetheless):
Microsoft Windows XP Service Pack 2 enables Windows Firewall, which
closes port 445 by default. Because Microsoft SQL Server communicates
over port 445, you must reopen the port if SQL Server is configured to
listen for incoming client connections using named pipes. For
information on configuring a firewall, see "How to: Configure a
Firewall for SQL Server Access" in SQL Server Books Online or review
your firewall documentation.
Another scenario is that the client configuration on the local machine is not configured correctly. From the run prompt, you can execute cliconfg (the SQL Server Client Configuration Utility) to see the enabled protocols and the aliases that are used for the protocols.
Either redefine your Data Source as suggested by usr's comment, or configure your SQL Server to allow TCP connections (Why would you not allow TCP connections anyway?).
Here is the link to enable TCP on your SQL Server (The accepted answer is where you want to look at):
Enable remote connections for SQL Server Express 2012
Are you running your code off of local disk or a network drive? I encountered a very similar problem where my network drive was not trusted in .Net and that was why my connections failed.
My window application works fine on my computer but when I install it on another computer a network-related error occurred...
I'm using sql server 2005, I have store the backup of the database, when i run it, it flags an error.
I'm using visual studio 10, C#,sql sever 2005
Error is..
"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 this happens it means that the program cannot connect to SQL Server with information you provided.
If for example you are trying to connect my-server\sqlexpress, usually you have one of this issues:
There is no computer named my-server in your network!
SQL Server is not installed on my-server.
Your client computer cannot reach my-server from the network. You can check this using ping command.
The installed SQL Server instance name on my-server is not sqlexpress (case-insensitive).
You have not enabled TCP/IP protocol for your installation instance of SQL Server in "Sql Server Configuration Manager".
You have not restarted SQL Server service after enabling TCP/IP.
Your SQL Server instance is not default instance, and SQL Server Browser service is not running on the server.
Server's firewall is preventing the client to access the server. Try turning off the firewall on the server (only to test this case).
Consider this a checklist, and start from the beginning. Check them one by one. And I hope that you find the problem.