SQL Server Unable to Access

Issue:
An error has occurred while establishing an connection to the server when connecting to SQL SERVER 2005.this failure may be caused by the fact under the default settings SQL SERVER does not exists

Cause:
The issues arise because of the client machine could not able access the SQL Server through default Network Protocol Port.

Resolutions:
Set the Port to 2301. Now by setting Port No in client application's connection string will resolve the issue.