Sign in with Microsoft
Sign in or create an account.
Select a different account.
You have multiple accounts
Choose the account you want to sign in with.


When you use Microsoft SQL Server 2012 with the Service Broker, database mirroring or Availability Groups, the connection to SQL Server database has high latency and the response takes much more time.


The issue occurs because, when the communication between two servers that use Service Broker, database mirroring or Availability Groups occurs, the window size of TCP protocol does not expand automatically. TCP window size determines the number of bytes that a sender can transmit without receiving an acknowledgement. When the client is receiving data from SQL Server database, the client holds a constant TCP window size. After large amount of data is sent from SQL Server database, the window size on the client will gradually come down to 0. Therefore, the connection to SQL Server database makes high latency and the response takes much more time.

Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

Need more help?

Want more options?

Explore subscription benefits, browse training courses, learn how to secure your device, and more.

Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.

Was this information helpful?

What affected your experience?
By pressing submit, your feedback will be used to improve Microsoft products and services. Your IT admin will be able to collect this data. Privacy Statement.

Thank you for your feedback!