In this article we dwell in to the possible causes behind SQL Server error 26
The SQL Server database, despite being counted amongst the best software in its class is hardly perfect. As with other software application, it too can falter and throw out error messages. One such error message that you may encounter while working on SQL Server application is error 26. It typically is accompanied by a message which mentions an error in locating the server instance.
This error is likely to occur when the user is trying to connect to the SQL Server. In most cases, the solution to this error is unknown and multiple steps may need to be tried out to resolve the issue. It is important to note that error 26 is encountered only in the case of your attempt to establish a connection to SQL Server named instance. In other words this does not occur while trying to connect to the SQL Server default instance. Let’s figure out the possible causes for Error 26 and also chart out some easy steps for its resolution.
Possible Cause behind Error 26
If we try to make a connection through SQL Server named instance, a SSRP UDP packet is delivered to the server machine UDP Port 1434. This is required to confirm the outline or organisation of the SQL instance. Without this step the client will not be able to connect to the server. As a result, an error message will appear. In short this may be crux of this particular error.
The main reason behind this error is that the client has failed to receive the SSRP UDP packet from SQL browser and therefore is facing hurdles.
To resolve the Error, perform the steps listed below
- At the very outset, check if the server name is correct. One also needs to check on typing mistakes.
- Please crosscheck if the instance name is valid. [Some applications use ServerInstance. While some of them use Server\Instance. So the user is supposed to try both . This step can avoid error.]
- Check if the server machine is under reach.
- Next check if the SQL Browser service is active on the server.
- Check if the firewall is on an active mode, then one needs to include an exception for sqlbrowser.exe or UDP Port 1434.
- Make sure that the remote connections mode is enabled on the SQL Server.
In most scenarios, once the steps listed above are performed, the issue likely to go away. In case it still persist try and replace server instance with tcp:serverinstance or np:serverinstance. That apart there is a chance that the error may persist if the client is using a vista machine with firewall on or if the user’s server is a named instance on the cluster or on a multi home machine.
SQL errors should not be ignored as some of them can be a precursor to a SQL Crash
While using the SQL Server database, it is likely that you would come across several error messages. However it is pertinent that you do not ignore these messages and understand what they signify. In some cases, error messages may be a precursor to a SQL crash. Further to save your data in the event of a SQL crash, invest in a sql recovery tool like DataNumen SQL Recovery application. This powerful software is designed to handle even the most extensive incidents of SQL corruption. With this tool around, you are never likely to lose any data stored in a SQL Server database.
Alan Chen is President & Chairman of DataNumen, Inc., which is the world leader in data recovery technologies, including access recovery and sql recovery software products. For more information visit https://www.datanumen.com/