Error network error ioexception connection refused connect

I am running a SQL Server Express 10.50.4000.0 on my machine.
I have enabled on the TCP/IP and made sure the port is set to 1433.
I have added an exception in my firewall for 1433.
The server service is running.
I have tried localhost and the computer name and both give the same error.
When i try localhostSQLEXPRESS or [USER-PC]SQLEXPRESS I received an error saying it could not find the database.

String driverName = "net.sourceforge.jtds.jdbc.Driver";
Class.forName(driverName);

String serverName = "localhost";
String instanceName = "ALLEN-PC\SQLEXPRESS";
String serverPort = "1433";
String database  = serverName +":" + serverPort+"/"+instanceName;
String url = "jdbc:jtds:sqlserver://" + database;
String username = "sa";
String password = "password";

connection = DriverManager.getConnection(url, username, password);

I receive the error:

Could not connect to the database Network error IOException: Connection refused: connect

with no additional context to investigate.

asked Aug 2, 2013 at 15:44

AllenAllen

1171 gold badge1 silver badge9 bronze badges

Make Sure that your SQL Server Browser service is active.
Goto AllProgram->SQL Server ->configuraton tools->SQL Server Configuration Manager->SQL Server Network Configuration-> Select your server instance and right click on TCP/IP then goto IPAddresses. Change/Place port number for all IP’s as 1433. Also make sure that the IP Address is Active and Enabled. Save it and restart the server.

answered Apr 14, 2017 at 11:38

vsriram92vsriram92

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There is no database server listening on localhost:1433

Check that the SQL Server Browser Service is running

So maybe using the ip address instead of localhost helps.

answered Aug 2, 2013 at 16:18

Open the Configuration Manager:
Start -> Microsoft SQL Server -> Configuration Tools -> SQL Server Configuration Manager
Enable the TCP/IP: from the left hand tree choose:
SQL Server Network Configuration-> Protocol for SQLEXPRESS-> TCP/IP
Right click and enable it.
Double click the TCP/IP and click on the “IP Addresses” Tab
Adding TCP/IP port : Enter TCP Port value to 1433 then click apply
Restart SQL Server: from the left hand tree, choose:
SQL Server Services -> SQL Server (SQLEXPRESS) -> right click and restart.

answered Oct 28, 2020 at 13:30

Solution 1:
Instead of using jtds driver use mssql-jdbc-9.4.0.jre8.jar

Replace:

Class.forName("net.sourceforge.jtds.jdbc.Driver");
con = DriverManager.getConnection("jdbc:jtds:sqlserver://<IP>:port/<DatabaseName>",userid,password);

With:

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");  
DriverManager.getConnection("jdbc:jtds:sqlserver://<IP>:port/<DatabaseName>",userid,password);

Solution 2:

Add ssl=request parameter in the connection string

con = DriverManager.getConnection("jdbc:jtds:sqlserver://<IP>:port/<DatabaseName>;ssl=request",userid,password);

answered Dec 16, 2021 at 12:44

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String driverName = "net.sourceforge.jtds.jdbc.Driver";
Class.forName(driverName);

String serverName = "localhost";
String instanceName = "ALLEN-PC\SQLEXPRESS";
String serverPort = "1433";
String database  = serverName +":" + serverPort+"/"+instanceName;
String url = "jdbc:jtds:sqlserver://" + database;
String username = "sa";
String password = "password";

connection = DriverManager.getConnection(url, username, password);

I receive the error:

Could not connect to the database Network error IOException: Connection refused: connect

with no additional context to investigate.

asked Aug 2, 2013 at 15:44

AllenAllen

1171 gold badge1 silver badge9 bronze badges

Make Sure that your SQL Server Browser service is active.
Goto AllProgram->SQL Server ->configuraton tools->SQL Server Configuration Manager->SQL Server Network Configuration-> Select your server instance and right click on TCP/IP then goto IPAddresses. Change/Place port number for all IP’s as 1433. Also make sure that the IP Address is Active and Enabled. Save it and restart the server.

answered Apr 14, 2017 at 11:38

vsriram92vsriram92

5181 gold badge4 silver badges15 bronze badges

There is no database server listening on localhost:1433

Check that the SQL Server Browser Service is running

So maybe using the ip address instead of localhost helps.

answered Aug 2, 2013 at 16:18

answered Oct 28, 2020 at 13:30

Solution 1:
Instead of using jtds driver use mssql-jdbc-9.4.0.jre8.jar

Replace:

Class.forName("net.sourceforge.jtds.jdbc.Driver");
con = DriverManager.getConnection("jdbc:jtds:sqlserver://<IP>:port/<DatabaseName>",userid,password);

With:

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");  
DriverManager.getConnection("jdbc:jtds:sqlserver://<IP>:port/<DatabaseName>",userid,password);

Solution 2:

Add ssl=request parameter in the connection string

con = DriverManager.getConnection("jdbc:jtds:sqlserver://<IP>:port/<DatabaseName>;ssl=request",userid,password);

answered Dec 16, 2021 at 12:44

Источник

Содержание

How to Fix java.net.ConnectException: Connection refused: connect in Java?
Error network error ioexception connection refused connect
jTDS Exception — Connection Refused.
How to resolve»java.sql.SQLException: Network error IOException: Connection refused: connect»
JTDS JDBC CONNECTON ERROR
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When connecting to a named instance JIRA throws Connection refused
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How to Fix java.net.ConnectException: Connection refused: connect in Java?

java.net.ConnectException: Connection refused: connect is the most frequent kind of occurring networking exception in Java whenever the software is in client-server architecture and trying to make a TCP connection from the client to the server. We need to handle the exception carefully in order to fulfill the communication problem. First, let us see the possible reasons for the occurrence of java.net.ConnectException: Connection refused.

As client and server involved, both should be in a network like LAN or internet. If it is not present, it will throw an exception on the client-side.
If the server is not running. Usually ports like 8080, (for tomcat), 3000 or 4200 (for react/angular), 3306(MySQL), 27017(MongoDB) or occupied by some other agents or totally down i.e. instance not started.
Sometimes a server may be running but not listening on port because of some overridden settings etc.
Usually, for security reasons, the Firewall will be there, and if it is disallowing the communication.
By mistake, the wrong port is mentioned in the port or the random port generation number given.
Connection string information wrong. For example:

Connection conn = DriverManager.getConnection(“jdbc:mysql://localhost/:3306 ?” + “user= &password=

Implementation: Here we are using MySQL database connectivity and connection info should be of this format. Now let us see the ways to fixing the ways of java.net.ConnectException: Connection refused. Ping the destination host by using the commands as shown below:

There are tools like “Putty” are available to communicate, and it is a free implementation of Telnet and SSH for Windows and Unix.

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jTDS Exception — Connection Refused.

Applies to: ManageEngine Applications Manager 9, Hyper-V, SQL Server 2008 SP1 CU4.

We installed a SQL Server 2008 64-bit instance on a Hyper-V virtual machine,
and then tried to install ManageEngine Applications Manager 9 on another
Hyper-V virtual machine that will access the SQL Server instance.

We were unable to install ManageEngine Applications Manager 9 (AppManager 9)
and found the following errors on the logs generated by the setup program:

java.sql.SQLException: Network error IOException: Connection refused:
connect
at
net.sourceforge.jtds.jdbc.ConnectionJDBC2. (ConnectionJDBC2.java:385)
at
net.sourceforge.jtds.jdbc.ConnectionJDBC3. (ConnectionJDBC3.java:50)
at net.sourceforge.jtds.jdbc.Driver.connect(Driver.java:182)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at jdbc.CreateSchema.createDataBaseAMDB_MSSQL(CreateSchema.java:154)
at jdbc.CreateSchema.instantiateConnection(CreateSchema.java:197)
at jdbc.CreateSchema.init(CreateSchema.java:84)
at jdbc.CreateSchema.main(CreateSchema.java:93)
at
com.adventnet.appmanager.server.startup.StartServer.startmysql(StartServer.j
ava:1268)
at
com.adventnet.appmanager.server.startup.StartServer.main(StartServer.java:86
9)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.tanukisoftware.wrapper.WrapperSimpleApp.run(WrapperSimpleApp.java:136)
at java.lang.Thread.run(Unknown Source)

In this case, this was an exception thrown by jTDS when it couldn’t connect
to the remote instance of SQL Server over TCP/IP port 1433. TCP/IP was not enabled on the SQL Server instance.

Perform the following steps to enable TCP/IP on the SQL Server instance:

1. Go to Start -> All Programs -> Microsoft SQL Server 2008 -> SQL Server
Configuration Manager

2. In SQL Server Configuration Manager, expand SQL Server Network
Configuration.

3. Click Protocols for MSSQLSERVER.

4. In the details pane, right-click the TCP/IP protocol, and then click
Enable.

5. Back in the console pane, click SQL Server Services.

6. In the details pane, right-click SQL Server (MSSQLSERVER), and then click
Restart, to stop and restart the SQL Server service.

If the problem continue after enabling TCP/IP, then verify your firewall is not blocking TCP/IP port 1433.

Источник

How to resolve»java.sql.SQLException: Network error IOException: Connection refused: connect»

I installed a «SQLSERVER 2000» on my system and I tried to access the same in java using jtds driver with the following connection details —

But when I try running the program getting the following error —

Please help me resolving this issue as I tried a lot on this from past 2 days without any success.

Please refer the screenshot for SQL server installation in my system,which I installed on D: drive.

Thanks in advance.

Vighnesh Udup wrote: I installed a «SQLSERVER 2000» on my system

Are you aware that SQL Server 2000 is really outdated? It’s been superseded by both SQL Server 2005 and SQL Server 2008 already.

That said, your connections are being denied. There are three possible reasons:
1) you have some firewall software that is blocking the connection.
2) the SQL Server 2000 is running on a different port.
3) your SQL Server 2000 is not configured to accept non-local connections.

To check if this is set correctly, open the «Server Network Utility». Make sure that TCP/IP is one of the enabled protocols, select it on the right and click Properties. Make sure that the port is 1433, or change the port in the connection string to match this port.

SCJP 1.4 — SCJP 6 — SCWCD 5 — OCEEJBD 6 — OCEJPAD 6
How To Ask Questions How To Answer Questions

Источник

JTDS JDBC CONNECTON ERROR

I try to connect my database using jtds driver.Error indicate **java.sql.SQLException: Network error IOException: Connection refused: connect* , then i check jtds Faq then i fallow these steps

Why do I get java.sql.SQLException: «Network error IOException: Connection refused: connect» when trying to get a connection?

The «Connection refused» exception is thrown by jTDS when it is unable to connect to the server. There may be a number of reasons why this could happen:

1. The server name is misspelled or the port number is incorrect.
2. SQL Server is not configured to use TCP/IP. Either enable TCP/IP from SQL Server’s Network Utility app or have jTDS connect via named pipes (see the URL format for information on how to do this).
3. There is a firewall blocking port 1433 on the server.
Error is still
I disable firewall also
my jdbc url is
*(«jdbc:jtds:sqlserver://220.247.224.219:1433/sms;username;password»);*

I install jtds driver on the c: drive program folder and configure it.
can any one help me to solve this problem.
So i wont to check my jtds installation correct , plese tel me how to install the jtds driver.
can any one help me

The «Connection refused» exception is thrown by jTDS when it is unable to connect to the server. There may be a number of reasons why this could happen:

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When connecting to a named instance JIRA throws Connection refused

Still need help?

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Platform notice: Server and Data Center only. This article only applies to Atlassian products on the server and data center platforms .

Problem

When attempting to connect to a database during a JIRA installation you get the following error:

Connecting to a named SQL database instance (popular with Clustering implementations of SQL Server) requires a special syntax.

Resolutions

Confirm that there is no firewall blocking the connection and the SQL server is running and accepting connections from JDBC-based utilities.

Manual Database configuration

Use the following $JIRA_HOME/ dbconfig.xml , replacing the username, password, and URL information as appropriate.
JIRA 7.4.x versions and before using the jtds database driver:

JIRA 7.5.x versions and above using the Microsoft SQL database driver:

This difference in the jdbc database drivers was noted int he JIRA 7.5 release notes as well, and in the KB Updating JDBC URL for Microsoft SQL Server.

Start JIRA and verify it starts up.

Setup Wizard Method

Step 2 of 4 in the setup wizard will prompt you for the database name. Use the following syntax for the database name.
JIRA 7.4.x and before versions:

JIRA 7.5.x and higher versions:

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Источник

Ошибка java.net.ConnectException: Connection refused является одним из самых распространенных сетевых исключений в Java. Эта ошибка возникает, когда вы работаете с архитектурой клиент-сервер и пытаетесь установить TCP-соединение от клиента к серверу.

Соединение также происходит в случае RMI (удаленного вызова метода), потому что RMI также использует протокол TCP-IP. При написании кода клиентского сокета на Java вы всегда должны обеспечивать правильную обработку этого исключения.

В этом руководстве по Java вы узнаете, почему возникает исключение при отказе в соединении и как решить проблему.

Причины

Отказ в соединении – это явный случай, когда клиент пытается подключиться через порт TCP, но не может это сделать. Вот некоторые из возможных причин, почему это происходит:

Клиент и Сервер, один или оба из них не находятся в сети.

Да, возможно, что они не подключены к локальной сети, Интернету или любой другой сети.

Сервер не работает.

Вторая наиболее распространенная причина – сервер не работает. Вы можете использовать следующие сетевые команды, например, ping, чтобы проверить, работает ли сервер.

Сервер работает, но не видит порт, к которому клиент пытается подключиться.

Это еще одна распространенная причина возникновения «java.net.ConnectException: соединение отклонено», когда сервер работает, но видит другой порт. Трудно разобраться в этом случае, пока вы не проверите конфигурацию.

Брандмауэр запрещает комбинацию хост-порт.

Почти каждая корпоративная сеть защищена. Если вы подключаетесь к сети других компаний, вам нужно убедиться, что они разрешают друг другу IP-адрес и номер порта.

Неверная комбинация хост-портов.

Проверьте последнюю конфигурацию на стороне клиента и сервера, чтобы избежать исключения отказа в соединении.

Неверный протокол в строке подключения.

TCP является базовым протоколом для многих высокоуровневых протоколов, включая HTTP, RMI и другие. Нужно убедиться, что вы передаете правильный протокол, какой сервер ожидает.

Если вам интересно узнать больше об этом, то изучите книгу по сетевым технологиям, такую как Java Network Programming (4-е дополнение), написанную Гарольдом Эллиоттом Расти.

Простое решение состоит в том, чтобы сначала выяснить фактическую причину исключения. Здесь важнее всего подход к поиску правильной причины и решения. Как только вы узнаете реальную причину, вам, возможно, даже не потребуется вносить какие-либо существенные изменения.

Вот несколько советов, которые могут помочь исправить ошибку java.net.ConnectException: Connection refused:

Сначала попытайтесь пропинговать целевой хост, если хост способен пинговать, это означает, что клиент и сервер находятся в сети.
Попробуйте подключиться к хосту и порту сервера, используя telnet. Если вы можете подключиться, значит что-то не так с вашим клиентским кодом. Кроме того, наблюдая за выводом telnet, вы узнаете, работает ли сервер или нет, или сервер отключает соединение.

Источник

Error network error ioexception connection refused connect

How to Fix java.net.ConnectException: Connection refused: connect in Java?