Cannot Connect To Sql Express Error 26
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Locating Server/Instance Specified) up vote 11 down vote favorite 5 I am at an loose end with one particular box that is running SQL Express 2008 R2. Windows Firewall is configured to allow inbound TCP & UDP 1433, 1434. Windows Firewall is configured to allow outbound TCP & UDP on any port. No other software AV/FW is currently running. When I try to connect to xxx.xxx.xxx.xxx\sqlexpress, it times connect to sql express database management studio out with the following error: TITLE: Connect to Server Cannot connect to xxx.xxx.xxx.xxx\SQLEXPRESS. ADDITIONAL 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: 26 - Error Locating Server/Instance Specified) (Microsoft SQL Server, Error: -1) For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&EvtSrc=MSSQLServer&EvtID=-1&LinkId=20476 BUTTONS: OK I have checked that remote connections are allowed on the server. I have confirmed TCP/IP is enabled and configured in SQL Server Configuration to allow connections on the external IP to 1433. I have also used Wireshark from my local machine and I can see requests for 1433 UDP going to the remote server. But using Wireshark on the remote server shows no inbound connection requests for 1433 UDP or anything from my external IP (with filtering to remote RDP from results). This makes me think it is a firewall issue. The server is hosted by an external company who have control over the PIX in front of our server. I need to troubleshoot this as much as possible myself as the hosting compa
★★★★★★★★★★★★★★★ SQL Server ConnectivityMay 13, 2007286 0 0 0 Users often see this error message when connection to a SQL Server and don't know where to start to solve the problem. In most forums, people says this is because remote
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connection is not enabled on the server. This is not exactly correct. Actually, this error message
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give customers very specific information and the solution is quite simple. First of all, you get this error message only if you are trying connect to sql express instance remotely to connect to a SQL Server named instance. For default instance, you never see this. Why? Because even if we failed at this stage (i.e. error locating server/instance specified), we will continue to try connect using default values, e.g http://stackoverflow.com/questions/6466974/unable-to-connect-to-sql-express-error-26-error-locating-server-instance-speci defaul TCP port 1433, default pipe name for Named Pipes. You may see other error message due to failure later, but not this error message. Every time client makes a connection to SQL Server named instance, we will send a SSRP UDP packet to the server machine UDP port 1434. We need this step to know configuration information of the SQL instance, e.g., protocols enabled, TCP port, pipe name etc. Without these information, client does know how to https://blogs.msdn.microsoft.com/sql_protocols/2007/05/13/sql-network-interfaces-error-26-error-locating-serverinstance-specified/ connect the server and it fails with this specified error message. In a word, the reason that we get this error message is the client stack could not receive SSRP response UDP packet from SQL Browser. It's easy to isolate the issue. Here are the steps:1) Make sure your server name is correct, e.g., no typo on the name. 2) Make sure your instance name is correct and there is actually such an instance on your target machine. [Update: Some application converts \ to . If you are not sure about your application, please try both ServerInstance and Server\Instance in your connection string]3) Make sure the server machineis reachable, e.g, DNS can be resolve correctly, you are able to ping the server (not always true). 4) Make sure SQL Browser service is running on the server.5) If firewall is enabled on the server, you need to put sqlbrowser.exe and/or UDP port 1434 into exception. Once you are done the steps, you should not see this error message anymore. You may still fail to connect your SQL server, but error message should be different and you have a different issue now. [Update: If it still fails, you may replace serverinstance with tcp:serverinstance and/or np:serverinstance and see if it succeeds with either TCP or NP protocol. That way, you can isolate the issue a little bit. ] There is one corner case where you may st
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Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top MS SQL Server Error 26 - Cannot connect up vote 1 down vote favorite 1 I'm trying to connect to my MS SQL SERVER Express 2012 database, which lives on my remote server. Everything is set up and configured correctly other than the Firewall. This is the first time I've done this with SQL 2012 and W2012 server. Reading multiple posts here on SU and the MS sites, shows that I need allow port 1433 (TCP). I have done this. When I try to connect to my remote server, I get a fairly common error message Error 26 - Error locating server/instance specified If I then disable the public profile on my Windows Firewall on my W2012 server, I can connect fine. This proves the issue is with the ports some where. What other ports do I need to open / what else do I need to do? Edit I have enable Named Pipes and TCP/IP. windows-server-2012-r2 sql-server-express share|improve this question edited Jul 20 '15 at 7:30 asked Jul 19 '15 at 14:10 MyDaftQuestions 2218 add a comment| 1 Answer 1 active oldest votes up vote 3 down vote accepted Add the following applications to your firewall where SQL Server is installed: C:\Program Files\Microsoft SQL Server\MSSQL11.SQLExpress\MSSQL\Binn\sqlservr.exe C:\Program Files (x86)\Microsoft SQL Server\90\Shared\sqlbrowser.exe C:\Program Files\Microsoft SQL Server\MSSQL12.SQLEXPRES