Sometimes your computer may display a 26 sql error message. There can be many reasons for this problem.

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SQL Server error 26 occurs when users try to connect directly to a named instance of SQL Server. The reason for SQL Server error 26 is that the client stack may not have been able to receive the SSRP response UPD packet from SQL Browser.

First printed on MSDN May 13, 2007.

Users often see my error message when connecting to SQL Server and don’t know what to do to clear the blockage. In most forums, people say that the remote connection type is never enabled on the server. If this value is not quite correct. In fact, new clients give very specific know-how for this type of error and the solution is quite simple.

First, you will only receive this handy error message when you try to connect to a named instance of SQL Server. For example, by default you will never see this. Why? Because even if we failed at this point (i.e. we couldn’t find the specified server/instance), consumers will still try to bind with default values ​​like ex. You may see several other error messages later due to errors, but this is not an error message.

Whenever a clientconnects to the actual named instance of SQL Server, we will most likely successfully send an SSRP UDP packet to UDP port 1434 of the server machine. We need this step to find out system information about the SQL moment, such as enabled protocols, TCP port, channel name, etc. Without this information, the client connects to most servers, but it does not work with this one. The specified error message failed.

Long story short, the reason I’m actually getting this error message is because someone’s stack client can’t get the SSRP response UDP packet from the SQL browser. The exit is easy to isolate. Here are the steps:
1) Make sure your server name is correct, e.g. not if there is a typo in the name.
2) Make sure your instance name is correct and that this situation actually exists on your target machine. [Update: Some applications convert to . If you’re unsure of your trusted application, try specifying both ServerInstance and ServerInstance in your connection string. ]
3) Make sure the type of server machine is available, e.g. , DNS can now be resolved correctly, you can still ping the server (not true).
4) Make sure SQL Browser is running on the server.
5) If a firewall is enabled on the server, the sqlbrowser.exe exception and/or UDP port 1434 must be enabled.

After you complete the steps, no one else should see this point of error. You still can’t connect to your SQL server, but the error message should still be different and now someone has a different problem. [ Update: If that still fails, you probably replace serverinstance with tcp:serverinstance and/or np:serverinstance and then check with TCP or NP if that succeeds. This way you can narrow down the problem a bit. ]

There is always a special case where you still fail after checking steps 1) through 4). This happens when a) your entire server is a named instance in a cluster or multihomed technology and b) your client is a great Vista machine with a firewall enabled. I have explained the details below: