This paper was wrote by amiT jaiN , referenced:http://www.csharpaspnetarticles.com/2010/01/sql-server-shared-memory-provider-error.html
 
Sql Server Shared Memory Provider error 233 No process is on the other end of the pipe

Cannot connect to SQLEXPRESS.
A connection was successfully established with the server, but then an error occurred during the login process. (provider: Shared Memory Provider, error: 0 – No process is on the other end of the pipe.) (Microsoft SQL Server, Error: 233)

If you are getting this erro while connecting to sql express server then you need to make changes mentioned below.

1. Click on Start menu > Programs > Microsoft Sql Server > Configuration Tools

2. Select Sql Server Surface Area Configuration.

3. Now click on Surface Area configuration for services and connections

4. On the left pane of pop up window click on Remote Connections and Select Local and Remote connectionsradio button.

5. Select Using both TCP/IP and named pipes radio button.

6. click on apply and ok.

Now when try to connect to sql server using sql username and password u’ll get the error mentioned below

Cannot connect to SQLEXPRESS.

ADDITIONAL INFORMATION:

Login failed for user ‘username’. The user is not associated with a trusted SQL Server connection. (Microsoft SQL Server, Error: 18452)
ation
To fix this error follow steps mentioned below

1. connect to sql server using window authentication.

2. Now right click on your server name at the top in left pane and select properties.

3. Click on security and select sql server and windows authentication mode radio button.

3. Click on OK.

4. restart sql server servive by right clicking on server name and select restart.

Now your problem should be fixed and u’ll be able to connect using sql server username and password.