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This also happens when the SQL Service is restarted, or the box is rebooted. If you see this on an old session you can try to refresh it by re-running the command or query to start a new session in Management Studio.
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It actually appears to be a registry setting that limits the number of connections from server 03 to sql 05.
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Sporadic Problem Server 2003 connecting to Sql 2005<br />
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System.Data.SqlClient.SqlE<wbr />xception: A transport-level error has occurred when sending the request to the server. (provider: TCP Provider, error: 0 - An existing connection was forcibly closed by the remote host
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Sporadic Problem Server 2003 connecting to Sql 2005

System.Data.SqlClient.SqlException: A transport-level error has occurred when sending the request to the server. (provider: TCP Provider, error: 0 - An existing connection was forcibly closed by the remote host

This also happens when the SQL Service is restarted, or the box is rebooted. If you see this on an old session you can try to refresh it by re-running the command or query to start a new session in Management Studio.

It actually appears to be a registry setting that limits the number of connections from server 03 to sql 05.

transport-level error server 2003 to sql 2005

The Windows operating systems have distinct methodologies for designing and implementing networks, and have specific systems to accomplish various networking processes, such as Exchange for email, Sharepoint for shared files and programs, and IIS for delivery of web pages. Microsoft also produces server technologies for networked database use, security and virtualization.

Windows Networking

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.

Microsoft SQL Server

Microsoft SQL Server 2005 is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning. It includes support for managing XML data and allows a database server to be exposed over web services using Tabular Data Stream (TDS) packets encapsulated within SOAP (protocol) requests.