Unable to connect sql server 2005 from iis

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SQL

IIS

server

I am unable to connect sql server 2005 (remote) from windows server 2008 r2 IIS. I can connect this server from visual studio 2010 and local sql server with same connection string. IIS server failed to connect remote server. I couldn't understand, why?

Please help me!!!



I am using the following connection string in web config :
<add name="remote" connectionstring="Data Source=server_name\instance_name;Initial Catalog=db_name;Integrated Security=false;user id=user_id; password=123;" />


Facing this error :
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)