sqlserver2012外部无法连接的解决办法

http://blog.sqlauthority.com/2009/05/21/sql-server-fix-error-provider-named-pipes-provider-error-40-could-not-open-a-connection-to-sql-server-microsoft-sql-server-error/

SQL SERVER – FIX : ERROR : (provider: Named Pipes Provider, error: 40 – Could not open a connection to SQL Server) (Microsoft SQL Server, Error:)

Regular readers of my blog are aware of the fact that I have written about this subject umpteen times earlier, and every time I have spoken about a new issue related to it.Few daysago, I had redone my local home network. I haveLAN setupwith wireless router connected with my four computers, two mobile devices, one printer and one VOIP solution. I had also formatted my primary computer and clean installed SQL Server 2008 into it. Yesterday, incidentally, I was sitting in my yard trying to connect SQL Server located inhome officeand suddenly I stumbled upon the following error. Finding the solution was the most infuriating part as it consumed my precious 10 minutes.

Let us look atfewof the common errors received:

An error has occurred while establishing a connection to the server.

(provider: Named Pipes Provider, error: 40 – Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 5)

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) (Microsoft SQL Server, Error: 1326)

I eventually found the resolution to this error on this blog itself; so I was saved from hunting for the solution. I am sure there are a number of developers who had previously fixed this error while installing SQL Server 2008 or SQL Server 2005 but in due course forgot the right solution to this error.This is just a quick refresher. Make sure to bookmark this as you never know when you would need this solution.

Let us check into the steps to resolve this error.

1)SQL Server should be up and running.

Go to All Programs >> Microsoft SQL Server 2008 >> Configuration Tools >> SQL Server Configuration Manager >> SQL Server Services, and check if SQL Server service status is “Running”.

In addition, ensure that your remote server is in the same network. Run “sqlcmd-L” in your command prompt to ascertain if your server is included in your network list. You can even findtutorialfor the same hereSQL SERVER – Find All Servers From Local Network – Using sqlcmd – Detect Installed SQL Server on Network.

I have confronted numerous situations when these nerve-wracking errors crop up, and most of the time when I try to troubleshoot I notice that SQL Server services are neither running nor installed. If SQL Server is not installed as default instance SQL Server Browser should be running together with it; we will explore this further in Topic 5.

2) Enable TCP/IP in SQL Server Configuration

When two or more SQL Servers are connected acrossnetworkthey do all communication using TCP/IP. The default port of SQL Server installation is 1433. This port can be changed throughSQL Server Configuration Manager. TCP/IP should be enabled for SQL Server to be connected.

Go to All Programs >> Microsoft SQL Server 2008 >> Configuration Tools >> SQL Server Configuration Manager >> Select TCP/IP

Right Click on TCP/IP >> Click on Enable

You must restart SQL Server Services for all the changes to take effect. Right click and go to menu properties to selectlocationwhere default port of SQL Server can be changed.

3) Open Port in Windows Firewall

Windows Firewall is very efficacious in protecting the Operating system from all sorts of malicious attacks. By default, many of the ports and services are refrained from running byfirewall. Time and again, SQL Server ports are not open in firewall as well. All the ports on which SQL Server is running should be added toexceptionand firewall should filter all the traffic from those ports. As described, by default SQL Server runs on port 1433, but ifdefault portis changed then the new port should be added toexception. If SQL Server has named instance (another instance besides default instance) is installed,SQL Server browsershould also be added to the exception, as described in Step 7.

Go to Control Panel >> Windows Firewall >> Change Settings >> Exceptions >> Add Port

Make the following entries in popup “Add a Port” and click OK.
Name : SQL
Port Number: 1433
Protocol: Select TCP

4) Enable Remote Connection

Enabling remote connection is another important, yet oft-neglected step that is frequently missed by database administrators while setting up SQL Server. If this feature is turned off SQL Server will function smoothly onlocal machine, but it will let another server connect to it remotely. By default this feature is ON in SQL Server 2008.

Right click on the server node and select Properties.

Go to Left Tab of Connections and check “Allow remote connections to this server”

5) Enable SQL Server Browser Service

If SQL Server is not installed as default instance but instead installed as named instance and also if there is no specific TCP/IP port configured, it will give rise to the error that is being discussed in this article. If SQL Server Browser service is enabled, it will allow the server to be connected through dynamic TCP/IP port. Enabling this service is a one-time process, as on enabling it once it will apply to all the instances installed on the same server.

Go to All Programs >> Microsoft SQL Server 2008 >> Configuration Tools >> SQL Server Configuration Manager >> SQL Server Browser

Right Click on SQL Server Browser >> Click on Enable

6) Create exception of sqlbrowser.exe in Firewall

As elucidated in Step 6,sqlbrowserservice needs to be enabled fornamedinstance. Windows Firewall may prevent sqlbrowser.exe to execute. So, it is imperative to addexceptionfor the same in windows firewall.

Search for sqlbrowser.exe on your local drive where SQL Server is installed. Copy the path of the sqlbrowser.exe like C:\Program Files\Microsoft SQL Server\90\Shared\sqlbrowser.exe and create the exception of the file in Firewall, as delineated inStep 3.

7) Recreate Alias

It is getting quite common to createaliasof SQL Server and use it inapplication. This will ensure that in future if any physical SQL Server has to be moved, it will not be required to change any code or connection string. You can simply createaliaswith the same name pointing to different SQL Server and it will start working instantaneously. I have observed that a couple of times due to internal error while recreating alias this error was fixed.

Go to All Programs >> Microsoft SQL Server 2008 >> Configuration Tools >> SQL Native Client 10.0 Configuration >> Aliases

Delete the alias thatis givingproblem and recreate it with identical parameters.

I have tried my best to include all the methods of fixing this error and if I have missed any, please leave a comment and I will be very glad to include them here. I have put in my effort to encompass this issue in one article that needs to be refereed when any connection error comes up.