We are developing and ASP .net application that uses the Project Server Interface (PSI) webservices. First of all, it uses a Windows authentication with the LoginWindows webservice. But if we use the LoginForms webservice (with a Login page) it doesn´t work and display the next error message: “An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connection. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)”. We have congifured the sql server to accept remote connections with TCP/IP. We also check in the PWA, the option to validate the user through forms and still not working.

http://blogs.msdn.com/sql_protocols/archive/2007/05/13/sql-network-interfaces-error-26-error-locating-server-instance-specified.aspx point out the root cause for this error message. Please check the web.config file for your web application to see if the connectionstring and connectstringname property for SQL server is right.

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