Error connecting to SQL Server Express using jTDS

Hi all! It's my first time using JDBC, and I followed some examples online to establish a test to my internal DB SQL Server Express connection. Here's the Basic code that I use (with security identification information redacted, of course):
public static Connection getConnection() throws Exception {
    Connection conn = null;
        
    try {
        Class.forName("net.sourceforge.jtds.jdbc.Driver");
        conn = DriverManager.getConnection("jdbc:jtds:sqlserver://WINSERVER/database", "username", "password");
    }
    catch(SQLException e) {
        throw new Exception("Error connecting to database: " + e.getMessage());
    }
    catch(ClassNotFoundException e) {
        throw new Exception(e.getMessage());
    }

    System.out.println("Connected to database");
    return conn;
  }
I get this error after 20 seconds: "network error IOException: Connection timed out: connect. I understand this is usually caused by a bad port, username or password, but I can connect using the exact same credentials via SQL Management Studio Express. I tried to insert port number: 1433 after the name of the server and the name of the comic, but no joy. Can someone tell me what is the 'official' syntax, or how I would go about solving this problem? Thanks in advance.

Zach

I get this error after 20 seconds: "network error IOException: Connection timed out: connect. I understand that this is usually caused by a bad port, user name or password.

Fairly certain that most of the last part of this is incorrect since your instance information.

If you connect to a server using what anyone, even remotely, as a true lan so if the server is not listening you will get an immediate connection error - saying something to the topic "connection refused." And if your creds user do not match you will get a different error.

A timeout after 20 seconds means that the network request is not being served at all, by the other other end.

And that suggests a firewall problem.

A simple test is the following
-Log in as the same user that the application is running as. If you are working on the app, it's you. Is there a sort of JEE or service/cron, then it is very likely that you.
-Open a console window.
-Use telnet to connect using EXACTLY the same hostname and port that you expect. An example

Telnet 1433 WINSERVER

If telnet is successful it will give you a white screen (or something similar). Failure will give an error.

The above process verifies that your box and the credentials of the user of the process (no connection) can successfully access the db box. Until it works your java code is not.

Common default for SQL Server ports 1433 and 1434. It can be configured to use anything else.

Tags: Java

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