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6 Appendix A: Product Behavior

  • Article

The information in this specification is applicable to the following Microsoft products or supplemental software. References to product versions include updates to those products.

  • Microsoft SQL Server 2000

  • Microsoft SQL Server 2005

  • Microsoft SQL Server 2008

  • Microsoft SQL Server 2008 R2

  • Microsoft SQL Server 2012

  • Microsoft SQL Server 2014

  • Microsoft SQL Server 2016

  • Microsoft SQL Server 2017

  • Microsoft SQL Server 2019

  • Microsoft SQL Server 2022

  • Windows XP operating system

  • Windows Server 2003 operating system

  • Windows Vista operating system

  • Windows Server 2008 operating system

  • Windows 7 operating system

  • Windows Server 2008 R2 operating system

  • Windows 8 operating system

  • Windows Server 2012 operating system

  • Windows 8.1 operating system

  • Windows Server 2012 R2 operating system

  • Windows 10 operating system

  • Windows Server 2016 operating system

  • Windows Server operating system

  • Windows Server 2019 operating system

  • Windows Server 2022 operating system

  • Windows 11 operating system

  • Windows Server 2025 operating system 

Exceptions, if any, are noted in this section. If an update version, service pack or Knowledge Base (KB) number appears with a product name, the behavior changed in that update. The new behavior also applies to subsequent updates unless otherwise specified. If a product edition appears with the product version, behavior is different in that product edition.

Unless otherwise specified, any statement of optional behavior in this specification that is prescribed using the terms "SHOULD" or "SHOULD NOT" implies product behavior in accordance with the SHOULD or SHOULD NOT prescription. Unless otherwise specified, the term "MAY" implies that the product does not follow the prescription.

<1> Section 2.2.5: The information for an instance of Microsoft SQL Server can include the RPC_INFO, SPX_INFO, ADSP_INFO, and BV_INFO tokens only if the version of the SQL Server instance is SQL Server 2000. SQL Server 2000 Browser, SQL Server 2005 Browser, SQL Server 2008 Browser, and SQL Server 2008 R2 Browser support sending information about instances of SQL Server 2000 and will send these tokens.

<2> Section 3.2.2: Windows implements the timers for these two messages as follows:

For the CLNT_UCAST_INST request:

Windows implementations that use Microsoft Data Access Components (MDAC) or Windows Data Access Components (Windows DAC) time out if no response is received within 1 second. If a valid response is received within 1 second, the response is passed to the higher layer. If the response is not valid, the process is repeated.

Windows implementations that use Microsoft SQL Server Native Client time out if no response is received within 1 second. If a valid response is received within 1 second, the response is immediately passed to the higher layer. If the response is not valid, an error is passed to the higher layer.

For the CLNT_UCAST_DAC request:

Windows implementations that use MDAC or Windows DAC do not support this request.

Windows implementations that use SQL Server Native Client time out if no response is received within 1 second. If a valid response is received within 1 second, the response is immediately passed to the higher layer. If the response is not valid, an error is passed to the higher layer.

<3> Section 3.2.2: Windows implements the timers for these two messages as follows:

For the CLNT_UCAST_EX request:

Windows implementations that use Microsoft Data Access Components (MDAC) or Windows Data Access Components (Windows DAC) time out if no response is received within 0.5 second. If a valid response is received, it is appended to the results. If the response is not valid, it is discarded. The process is repeated until a time-out occurs.

Windows implementations that use SQL Server Native Client time out if no response is received within the lesser of 5 seconds or the specified logon time-out (the default logon time-out is 15 seconds.) If a valid response is received, it is appended to the results. If the response is not valid, it is discarded. The process is repeated for a maximum time period of the lesser of 5 seconds or the specified logon time-out.

For the CLNT_BCAST_EX request:

Windows implementations that use MDAC or Windows DAC time out if no response is received within 0.5 second. If a valid response is received, it is appended to the results. If the response is not valid, it is discarded. The process is repeated until a time-out occurs. There is no maximum time-out limit.

Windows implementations that use SQL Server Native Client time out if no response is received within 5 seconds and then each 1 second up to 15 seconds or to the specified logon time-out, if valid responses are not received within each respective interval. If valid responses are received, they are appended to the results; however, invalid responses are discarded. The default logon time-out is 15 seconds.

<4> Section 3.2.5.4: Microsoft clients, such as Microsoft Data Access Components (MDAC), Windows Data Access Components (Windows DAC), or SQL Server Native Client, consider a SVR_RESP message to a CLNT_UCAST_EX type request to be improperly formatted if the RESP_DATA field is more than 4,096 bytes.