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I tried to make a mail service with connection to the SQL Server, when I reached 

 con.open(); //where con is the sqlconnection string

It said:

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)

I tried to enable tcp/ip, checked all services and it were enabled! and even I gave permissions to own user (me). Still it didn't work!

What can I do now ?

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  • try telnet ip 1433 Commented May 4, 2016 at 13:12
  • 3
    are you able to connect to the database from SQL server management studio. Commented May 4, 2016 at 13:18
  • do you close the conn after you finished using it? Commented May 4, 2016 at 13:37
  • @Manish i am able to Commented May 4, 2016 at 13:53

1 Answer 1

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I am solving that problem by opening Services then start running SQL Server (SqlExpress) service.

enter image description here

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