SQL Server Protocols

The Microsoft SQL Server Protocols documentation contains detailed technical specifications for Microsoft protocols that are implemented and used by SQL Server to interoperate or communicate with other Microsoft products. It also contains technical specifications for extensions to industry-standard and other published protocols that are used by SQL Server. In addition, the documentation set includes a companion overview document that supplements the technical specifications with conceptual background information, overviews of inter-protocol relationships and interactions, and technical references.

Although the Open Specifications technical documents are freely available, many of them include patented inventions. Some of these patents are available at no charge under the Open Specifications Promise or the Microsoft Community Promise. The remaining patents are available through various licensing programs. For more information, please visit the Microsoft Open Specifications Dev Center website or send an email message to the IP Licensing Team.

Explore SQL Server Protocols Documentation


SQL Server Protocols Overview Document

Provides information about the protocols and other technologies that are included in the SQL Server Protocols documentation set and the relationships among those technologies.


SQL Server Protocols Technical Documents

Provides detailed technical specifications for Microsoft proprietary protocols (including extensions to industry-standard or other published protocols) and other technologies that are used by SQL Server to communicate with other Microsoft products.

Forums and Blogs


Open Specifications Forums

These MSDN user forums are available to answer technical questions about the Open Specifications documents.


Open Specifications Blogs

These blogs, authored by the engineers who support the Open Specifications documents, provide a different venue for further discussion of those documents.

What's New and Changed

What's New and Changed lists the SQL Server Protocols documents that fall into new or updated category.

Important   To download a .zip file that contains PDF copies of all the SQL Server Protocols documentation, including both changed and unchanged documents, see SQL Server Protocols Documents.


SQL Server Protocols PDF .zip file (34+ MB)

SQL Server Developer Downloads

How To

SQL Server Developer Center

SQL Server TechCenter


Open Specifications Developer Center

Microsoft Open Specifications