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You receive error messages when the connection to Azure SQL Database fails. These connection problems can be caused by Azure SQL Database reconfiguration, firewall settings, a connection timeout, incorrect login information or failure to apply best practices and design guidelines during the [application design] (sql-database-develop-overview.md) process. Additionally, if the maximum limit on some Azure SQL Database resources is reached, you can't connect to Azure SQL Database.
Transient fault error messages (40197, 40613 and others)
The Azure infrastructure has the ability to dynamically reconfigure servers when heavy workloads arise in the SQL Database service. This dynamic behavior might cause your client program to lose its connection to SQL Database. This kind of error condition is called a transient fault. Database reconfiguration events occur because of a planned event (for example, a software upgrade) or an unplanned event (for example, a process crash, or load balancing). Most reconfiguration events are generally short-lived and should be completed in less than 60 seconds at most. However, these events can occasionally take longer to finish, such as when a large transaction causes a long-running recovery. The following table lists various transient errors that applications can receive when connecting to SQL Database
List of transient fault error codes
Steps to resolve transient connectivity issues
Implementing Retry Logic
It is strongly recommended that your client program has retry logic so that it could reestablish a connection after giving the transient fault time to correct itself. We recommend that you delay for 5 seconds before your first retry. Retrying after a delay shorter than 5 seconds risks overwhelming the cloud service. For each subsequent retry the delay should grow exponentially, up to a maximum of 60 seconds.
For code examples of retry logic, see:
For additional information on handling transient errors in your application review
A discussion of the blocking period for clients that use ADO.NET is available in SQL Server Connection Pooling (ADO.NET).
A network-related or instance-specific error occurred while establishing a connection to SQL Database server
The issue occurs if the application can't connect to the server.
To resolve this issue, try the steps (in the order presented) in the Steps to fix common connection issues section.
The server/instance was not found or was not accessible (errors 26, 40, 10053)Error 26: Error Locating server specifiedSystem.Data.SqlClient.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: SQL Network Interfaces, error: 26 – Error Locating Server/Instance Specified)
Error 40: Could not open a connection to the serverA 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)
Error 10053: A transport-level error has occurred when receiving results from the server10053: A transport-level error has occurred when receiving results from the server. (Provider: TCP Provider, error: 0 - An established connection was aborted by the software in your host machine)
These issues occur if the application can't connect to the server.
To resolve these issues, try the steps (in the order presented) in the Steps to fix common connection issues section.
Cannot connect to server due to firewall issuesError 40615: Cannot connect to < servername >
To resolve this issue, configure firewall settings on SQL Database through the Azure portal.
Error 5: Cannot connect to < servername >
To resolve this issue, make sure that port 1433 is open for outbound connections on all firewalls between the client and the internet.
For more information, see Configure the Windows Firewall to allow SQL Server access.
Unable to log in to the server (errors 18456, 40531)Login failed for user '< User name >'Login failed for user '<User name>'.This session has been assigned a tracing ID of '<Tracing ID>'. Provide this tracing ID to customer support when you need assistance. (Microsoft SQL Server, Error: 18456)
To resolve this issue, contact your service administrator to provide you with a valid SQL Server user name and password.
Typically, the service administrator can use the following steps to add the login credentials: Dc 6v dmg 03 05.
For more information, see Managing databases and logins in Azure SQL Database. Ms dos utilites disk dmg.
Connection timeout expired errorsSystem.Data.SqlClient.SqlException (0x80131904): Connection Timeout ExpiredSystem.Data.SqlClient.SqlException (0x80131904): Connection Timeout Expired. The timeout period elapsed while attempting to consume the pre-login handshake acknowledgement. This could be because the pre-login handshake failed or the server was unable to respond back in time. The duration spent while attempting to connect to this server was - [Pre-Login] initialization=3; handshake=29995;
System.Data.SqlClient.SqlException (0x80131904): Timeout expiredSystem.Data.SqlClient.SqlException (0x80131904): Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.
System.Data.Entity.Core.EntityException: The underlying provider failed on OpenSystem.Data.Entity.Core.EntityException: The underlying provider failed on Open. -> System.Data.SqlClient.SqlException: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. -> System.ComponentModel.Win32Exception: The wait operation timed out
Cannot connect to < server name >Cannot connect to <server name>.ADDITIONAL INFORMATION:Connection Timeout Expired. The timeout period elapsed during the post-login phase. The connection could have timed out while waiting for server to complete the login process and respond; Or it could have timed out while attempting to create multiple active connections. The duration spent while attempting to connect to this server was - [Pre-Login] initialization=231; handshake=983; [Login] initialization=0; authentication=0; [Post-Login] complete=13000; (Microsoft SQL Server, Error: -2) For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft%20SQL%20Server&EvtSrc=MSSQLServer&EvtID=-2&LinkId=20476 The wait operation timed out
These exceptions can occur either because of connection or query issues. To confirm that this error is caused by connectivity issues, see Confirm whether an error is caused by a connectivity issue.
Connection timeouts occur because the application can't connect to the server. To resolve this issue, try the steps (in the order presented) in the Steps to fix common connection issues section.
Resource governance errorsError 10928: Resource ID: %d10928: Resource ID: %d. The %s limit for the database is %d and has been reached. See http://go.microsoft.com/fwlink/?LinkId=267637 for assistance. The Resource ID value in error message indicates the resource for which limit has been reached. For sessions, Resource ID = 2.
To work around this issue, try one of the following methods:
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If the database consistently reaches its limit despite addressing blocking and long-running queries, consider upgrading to an edition with more resources Editions).
For more information about dynamic management views, see System dynamic management views.
For more information about database limits, see SQL Database resource limits for Azure SQL Database server.
Error 10929: Resource ID: 110929: Resource ID: 1. The %s minimum guarantee is %d, maximum limit is %d and the current usage for the database is %d. However, the server is currently too busy to support requests greater than %d for this database. See http://go.microsoft.com/fwlink/?LinkId=267637 for assistance. Otherwise, please try again later.
Error 40501: The service is currently busy40501: The service is currently busy. Retry the request after 10 seconds. Incident ID: %ls. Code: %d.
This is an engine throttling error, an indication that resource limits are being exceeded.
For more information about resource limits, see Database server resource limits.
Error 40544: The database has reached its size quota40544: The database has reached its size quota. Partition or delete data, drop indexes, or consult the documentation for possible resolutions. Incident ID: <ID>. Code: <code>.
This error occurs when the database has reached its size quota.
The following steps can either help you work around the problem or provide you with additional options:
Error 40549: Session is terminated because you have a long-running transaction40549: Session is terminated because you have a long-running transaction. Try shortening your transaction.
If you repeatedly encounter this error, try to resolve the issue by following these steps:
Also consider batching your queries. For information on batching, see How to use batching to improve SQL Database application performance.
For an in-depth troubleshooting procedure, see Is my query running fine in the cloud?.
![]() Error 40551: The session has been terminated because of excessive TEMPDB usage40551: The session has been terminated because of excessive TEMPDB usage. Try modifying your query to reduce the temporary table space usage.
To work around this issue, follow these steps:
Error 40552: The session has been terminated because of excessive transaction log space usage40552: The session has been terminated because of excessive transaction log space usage. Try modifying fewer rows in a single transaction.
To resolve this issue, try the following methods:
Error 40553: The session has been terminated because of excessive memory usageI opened a dmg file. 40553 : The session has been terminated because of excessive memory usage. Try modifying your query to process fewer rows.
To work around this issue, try to optimize the query.
For an in-depth troubleshooting procedure, see Is my query running fine in the cloud?.
Table of additional resource governance error messages
Elastic pool errors
The following errors are related to creating and using elastic pools:
Cannot open database 'master' requested by the login. The login failed
This issue occurs because the account doesn't have permission to access the master database. But by default, SQL Server Management Studio (SSMS) tries to connect to the master database.
To resolve this issue, follow these steps:
Confirm whether an error is caused by a connectivity issue
To confirm whether an error is caused by a connectivity issue, review the stack trace for frames that show calls to open a connection like the following ones (note the reference to the SqlConnection class):
When the exception is triggered by query issues, you'll notice a call stack that's similar to the following (note the reference to the SqlCommand class). In this situation, tune your queries.
For additional guidance on fine-tuning performance, see the following resources:
Steps to fix common connection issues
If these steps don't resolve your problem, try to collect more data and then contact support. If your application is a cloud service, enable logging. This step returns a UTC time stamp of the failure. Additionally, SQL Azure returns the tracing ID. Microsoft Customer Support Services can use this information.
For more information about how to enable logging, see Enable diagnostics logging for apps in Azure App Service.
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