I have rabbitMQ server running on vm.
I am following rabbitMQ java tutorial.
It works fine locally on the vm but when trying to send from the host I get an exception
Exception in thread "main" java.net.ConnectException: Connection timed out: connect
at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at com.rabbitmq.client.impl.FrameHandlerFactory.create(FrameHandlerFactory.java:32)
at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:714)
at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:760)
at Send.main(Send.java:16)
here is the send code i am using:
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.Connection;
import java.util.concurrent.TimeoutException;
import com.rabbitmq.client.Channel;
public class Send {
private final static String QUEUE_NAME = "hello";
public static void main(String[] args) throws java.io.IOException, TimeoutException {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("192.168.198.100");
factory.setPort(5672);
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME, false, false, false, null);
String message = "Hello World from Windows!";
channel.basicPublish("", QUEUE_NAME, null, message.getBytes());
System.out.println(" [x] Sent '" + message + "'");
channel.close();
connection.close();
}
}
I can ping the server at 192.168.198.100 but I can't access the managment UI at
192.168.198.100:15672/
So could anyone help me figure out what's wrong with this issue?
Thanks in advance.
1.
You are using guest guest as credentials, and it is not allowed for remote IP.
Please read this: Can't access RabbitMQ web management interface after fresh install
then you have to add this:
factory.setPassword("test");
factory.setUsername("test");
2.
Did you enable the management UI? if not use:
rabbitmq-plugins enable rabbitmq_management
3.
check your firewall configuration maybe the ports 5672 and 15672 are closed.
You can use telnet to test the ports:
telnet 192.168.198.100 5672
Trying 192.168.198.100...
Connected to 192.168.198.100.
Escape character is '^]'.
and:
telnet 192.168.198.100 15672
Trying 192.168.198.100...
Connected to 192.168.198.100.
Escape character is '^]'.
Related
I've installed GridDB on Ubuntu. I use 2 computers: first computer is used as GridDB server, second as java Client and when i try to connect to GriDB from second computer it throws Exception, but when I run java code in server side it works completely fine. What's the problem? I use this tutorial.
Here is simple java code:
import java.util.Arrays;
import java.util.Properties;
import com.toshiba.mwcloud.gs.Collection;
import com.toshiba.mwcloud.gs.GSException;
import com.toshiba.mwcloud.gs.GridStore;
import com.toshiba.mwcloud.gs.GridStoreFactory;
import com.toshiba.mwcloud.gs.Query;
import com.toshiba.mwcloud.gs.RowKey;
import com.toshiba.mwcloud.gs.RowSet;
// Operaton on Collection data
public class Sample1 {
static class Person {
#RowKey String name;
boolean status;
long count;
byte[] lob;
}
public static void main(String[] args) throws GSException {
// Get a GridStore instance
Properties props = new Properties();
props.setProperty("notificationAddress", "239.0.0.1");
props.setProperty("notificationPort", "31999");
props.setProperty("clusterName", "defaultCluster");
props.setProperty("user", "admin");
props.setProperty("password", "admin");
GridStore store = GridStoreFactory.getInstance().getGridStore(props);
// Create a Collection (Delete if schema setting is NULL)
Collection<String, Person> col = store.putCollection("col01", Person.class);
}
}
here is Exception, when i try to connect from second computer:
com.toshiba.mwcloud.gs.common.GSConnectionException: [145028:JC_BAD_CONNECTION] Failed to connect (address=/127.0.1.1:10001, reason=Connection refused: connect)
at com.toshiba.mwcloud.gs.subnet.NodeConnection.<init>(NodeConnection.java:142)
at com.toshiba.mwcloud.gs.subnet.NodeConnectionPool.resolve(NodeConnectionPool.java:163)
at com.toshiba.mwcloud.gs.subnet.NodeResolver.updateConnectionAndClusterInfo(NodeResolver.java:644)
at com.toshiba.mwcloud.gs.subnet.NodeResolver.prepareConnectionAndClusterInfo(NodeResolver.java:529)
at com.toshiba.mwcloud.gs.subnet.NodeResolver.getPartitionCount(NodeResolver.java:205)
at com.toshiba.mwcloud.gs.subnet.GridStoreChannel$5.execute(GridStoreChannel.java:2106)
at com.toshiba.mwcloud.gs.subnet.GridStoreChannel.executeStatement(GridStoreChannel.java:1675)
at com.toshiba.mwcloud.gs.subnet.GridStoreChannel.executeResolver(GridStoreChannel.java:1912)
at com.toshiba.mwcloud.gs.subnet.GridStoreChannel.resolvePartitionId(GridStoreChannel.java:2103)
at com.toshiba.mwcloud.gs.subnet.SubnetGridStore.putContainer(SubnetGridStore.java:968)
at com.toshiba.mwcloud.gs.subnet.SubnetGridStore.putCollection(SubnetGridStore.java:1024)
at com.toshiba.mwcloud.gs.subnet.SubnetGridStore.putCollection(SubnetGridStore.java:787)
at com.toshiba.mwcloud.gs.subnet.SubnetGridStore.putCollection(SubnetGridStore.java:98)
at pac.Main.main(Main.java:39)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at com.toshiba.mwcloud.gs.subnet.NodeConnection.<init>(NodeConnection.java:129)
... 13 more
Caused by: java.net.ConnectException: Connection refused: connect
The problem is that the server is not accepting connections from the second machine. This could be due to a number of things. The most likely are:
Your server is not listening for requests on its external IP address. (For example, the DB may be listening on 127.0.0.1 only.) On the server, check what services are listening on the server's external IP address; e.g. https://www.tecmint.com/find-listening-ports-linux/.
Your client may be configured to talk to the wrong server, or to use the wrong port.
Firewalls. (Though the normal firewall behavior would be to drop the connection packets, leading to a different exception.)
There are other possibilities, but the above should be enough to get you started.
If the above haven't identified the problem, you will need to resort to things like:
Check to see what happens when you connect to that database server / port using a TCP diagnostic tool. Does it connect at the TCP level?
Use a network packet sniffer to see what happens to the TCP packets when the client tries to connect to the database.
Check your route tables and IP tables for strange routing rules. If you are using a virtual machine, check at the hypervisor level too.
239.0.0.1 is a multicast address. And often it needs to do some additional steps with OS, router settings to enable multicast.
So it makes sense to check if multicast is enabled: https://serverfault.com/questions/294207/how-can-i-test-multicast-udp-connectivity-between-two-servers
And also you could check that the IP/port, with which the GridDB node is registered in the cluster, is accessible.
The IP address can be obtained with next command:
$ gs_stat -u admin/admin
I'm receiving java socket programming exception. This is a code from the Book "Java Complete reference Oracle"
import java.net.*;
import java.io.*;
public class Whois {
public static void main(String[] args)throws Exception{
int c;
Socket s = new Socket("whois.internic.net",43);
InputStream in = s.getInputStream();
OutputStream out = s.getOutputStream();
String str = (args.length == 0 ? "OraclePressBooks.com" : args[0]) + "\n";
byte buf[] = str.getBytes();
out.write(buf);
while((c=in.read())!=-1)
{
System.out.println((char)c);
}
s.close();
}
}
I'm getting following exception. But Why?
Exception in thread "main" java.net.ConnectException: Connection timed out: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at Whois.main(Whois.java:8)
P.S. I'm using Eclipse Photon. I tried running eclipse "as administrator" and also without it.
You do not have network connectivity to remote TCP port 43.
But since you've written that you have "proper network connection" because you are "using WiFi", we may suppose you have at least a web access (through a transparent proxy, or direct connections).
Therefore, you can simply use a Whois web service to access Whois databases.
Some registrars offer a RWS-DNRD endpoint, that is a RESTful Web Service for Domain Name Registration Data (https://tools.ietf.org/id/draft-sheng-weirds-icann-rws-dnrd-01.html). You will find many examples of RESTful clients, for instance here: https://www.javacodegeeks.com/2012/09/simple-rest-client-in-java.html
In your case, you want to access the Internic database, so you can simply query their web form, using a GET request, like that (Java 9):
URL u = new URL("https://reports.internic.net/cgi/whois?whois_nic=OraclePressBooks.com&type=domain");
try (InputStream in = u.openStream()) {
return new String(in.readAllBytes(), StandardCharsets.UTF_8);
}
I'm trying to connect a simple RabbitMQ using java code to my server (which is executing the RabbitMQ service).
Executing the following code (source here) gives me the java.net.SocketException: Connection Reset exception.
import java.io.*;
import java.security.*;
import com.rabbitmq.client.*;
public class test
{
public static void main(String[] args) throws Exception
{
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("myIP"); //myIP is just dummy text, I have a real IP there
factory.setPort(5672);
factory.setUsername("admin");
factory.setPassword("sesgo");
factory.setVirtualHost("vSESGO");
factory.useSslProtocol();
Connection conn = factory.newConnection();
Channel channel = conn.createChannel();
channel.queueDeclare("rabbitmq-java-test", false, true, true, null);
channel.basicPublish("", "rabbitmq-java-test", null, "Hello, World".getBytes());
GetResponse chResponse = channel.basicGet("rabbitmq-java-test", false);
if(chResponse == null) {
System.out.println("No message retrieved");
} else {
byte[] body = chResponse.getBody();
System.out.println("Recieved: " + new String(body));
}
channel.close();
conn.close();
}
}
I've looked for an answer online and I've already tried:
Verifying the server has the port I'm connecting to opened.
Verifying the client does not block my connection with firewalls, etc.
Creating a new Virtual Host on RabbitMQ and giving permissions to it.
Verifying iptables is not blocking me at the server side.
Nothing seems to work, any ideas?
Full stacktrace here:
This trust manager trusts every certificate, effectively disabling peer verification. This is convenient for local development but prone to man-in-the-middle attacks. Please see http://www.rabbitmq.com/ssl.html#validating-cerficates to learn more about peer certificate validation.
Exception in thread "main" java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at sun.security.ssl.InputRecord.readFully(Unknown Source)
at sun.security.ssl.InputRecord.read(Unknown Source)
at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
at sun.security.ssl.SSLSocketImpl.writeRecord(Unknown Source)
at sun.security.ssl.AppOutputStream.write(Unknown Source)
at java.io.BufferedOutputStream.flushBuffer(Unknown Source)
at java.io.BufferedOutputStream.flush(Unknown Source)
at java.io.DataOutputStream.flush(Unknown Source)
at com.rabbitmq.client.impl.SocketFrameHandler.sendHeader(SocketFrameHandler.java:147)
at com.rabbitmq.client.impl.SocketFrameHandler.sendHeader(SocketFrameHandler.java:153)
at com.rabbitmq.client.impl.AMQConnection.start(AMQConnection.java:294)
at com.rabbitmq.client.impl.recovery.RecoveryAwareAMQConnectionFactory.newConnection(RecoveryAwareAMQConnectionFactory.java:63)
at com.rabbitmq.client.impl.recovery.AutorecoveringConnection.init(AutorecoveringConnection.java:99)
at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:921)
at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:880)
at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:838)
at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:990)
at test.main(test.java:25)
I had the same issue right here: RabbitMQ Connection reset Exception. Solution for Windows was to add backslash in rabbit config file for paths to certs and key.
I don't know if this applies to your situation, but I recently resolved a similar situation while testing RabbitMQ 3.8.3, and the cause was that the key I was referencing was password-protected, but I had failed to provide the password in the RabbitMQ config, like this:
ssl_options.password = password
Unfortunately there was absolutely nothing in the RabbitMQ logs about this, even with the log level set to debug. When testing via various clients, a connection was established, but RabbitMQ immediately sent a connection reset.
I had this exact same error and my issue was in the rabbitmq.conf file. I was trying to use a JKS file for the following ssl options. Generating my own self signed .pem files was able to help fix this. I followed this guide pretty closely https://www.codetd.com/en/article/12031242.
ssl_options.cacertfile = /etc/rabbitmq/ca_certificate.pem
ssl_options.certfile = /etc/rabbitmq/server_certificate.pem
ssl_options.keyfile = /etc/rabbitmq/server_key.pem
I'm trying to test a connection to Remedy using the Java API, i.e. arapi7604_build002.jar.
According to the documentation, 4100 is a common AR System server port: https://docs.bmc.com/docs/display/public/itsm81/Port+information, but this isn't working for me:
private ARServerUser server;
private RemedyJavaAPITest() {
server = new ARServerUser();
server.setServer("fqd.com");
server.setUser("userName");
server.setPassword("pass123");
server.setPort(???);
}
public static void main(String[] args) {
RemedyJavaAPITest test = new RemedyJavaAPITest();
test.connect();
test.cleanup();
}
Error:
Connecting to AR Server...
ERROR (90): Cannot establish a network connection to the AR System server; Connection timed out: connect fqdn.com:4100
at com.bmc.arsys.apitransport.ApiProxyJRpcBase.connectionTry(Unknown Source)
at com.bmc.arsys.api.ProxyJRpc.getRpcClient(Unknown Source)
at com.bmc.arsys.api.ProxyJRpc.<init>(Unknown Source)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.bmc.arsys.apitransport.connection.b.a(Unknown Source)
at com.bmc.arsys.apitransport.connection.b.createProxy(Unknown Source)
at com.bmc.arsys.api.ProxyManager.createProxy(Unknown Source)
at com.bmc.arsys.api.ProxyPool.createProxy(Unknown Source)
at com.bmc.arsys.apitransport.connection.a.get(Unknown Source)
at com.bmc.arsys.apitransport.connection.c.getProxy(Unknown Source)
at com.bmc.arsys.api.PoolingProxyManager.getProxy(Unknown Source)
at com.bmc.arsys.apitransport.connection.c.getProxy(Unknown Source)
at com.bmc.arsys.api.ARServerUser.verifyUser(Unknown Source)
at RemedyJavaAPITest.connect(RemedyJavaAPITest.java:37)
at RemedyJavaAPITest.main(RemedyJavaAPITest.java:28)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Usually the port in which AR Server is listening for incoming connections can be configured. Please get it confirmed with your Remedy Administrators/Developers Below are some of the points you should take care while doing this.
Make sure that the machine where AR server is installed is reachable from the machine where you are running your java program.
setServer() required hostname(anything) which will connect to your target machine(hostname should be a resolvable one)
If you are able to connect to host machine and port number is wrong, you would getting an error message which says 'Connection Refused'. But you are getting 'timed out', which usually means your connection request is not received any reply from the network. So confirm your host name.
3700 is also commonly used for AR Servers.
Am trying to connect DB2 database in java but it throwing error, I can't find what issue was that. I added db2jcc.jar and here I show my complete database connectivity code.
public class ConnectionExample {
public static void main(String[] args) {
String jdbcClassName="com.ibm.db2.jcc.DB2Driver";
String url="jdbc:db2://localhost:50000/TestDb";
String user="user";
String password="pass#123";
Connection connection = null;
try {
//Load class into memory
Class.forName(jdbcClassName);
//Establish connection
connection = DriverManager.getConnection(url, user, password);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}finally{
if(connection!=null){
System.out.println("Connected successfully.");
try {
connection.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
}
Am trying to connect DB2 database with the above code but it throws error.
com.ibm.db2.jcc.am.DisconnectNonTransientConnectionException: [jcc][t4][2043][11550][3.63.123] Exception java.net.ConnectException: Error opening socket to server localhost/127.0.0.1 on port 50,000 with message: Connection refused: connect. ERRORCODE=-4499, SQLSTATE=08001
at com.ibm.db2.jcc.am.fd.a(fd.java:321)
at com.ibm.db2.jcc.am.fd.a(fd.java:340)
at com.ibm.db2.jcc.t4.xb.a(xb.java:433)
at com.ibm.db2.jcc.t4.xb.<init>(xb.java:90)
at com.ibm.db2.jcc.t4.a.z(a.java:347)
at com.ibm.db2.jcc.t4.b.a(b.java:1974)
at com.ibm.db2.jcc.am.ib.a(ib.java:691)
at com.ibm.db2.jcc.am.ib.<init>(ib.java:644)
at com.ibm.db2.jcc.t4.b.<init>(b.java:330)
at com.ibm.db2.jcc.DB2SimpleDataSource.getConnection(DB2SimpleDataSource.java:231)
at com.ibm.db2.jcc.DB2SimpleDataSource.getConnection(DB2SimpleDataSource.java:197)
at com.ibm.db2.jcc.DB2Driver.connect(DB2Driver.java:472)
at com.ibm.db2.jcc.DB2Driver.connect(DB2Driver.java:113)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at ConnectionExample.main(ConnectionExample.java:18)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at com.ibm.db2.jcc.t4.x.run(x.java:38)
at java.security.AccessController.doPrivileged(Native Method)
at com.ibm.db2.jcc.t4.xb.a(xb.java:419)
... 13 more
Hope Someone helps me to find out the solution. Thanks
Actually the port 50000 is not opened that is the reason I got the error after change that port to 51020 it works fine also it connects with database.
String url="jdbc:db2://localhost:51020/TestDb";
Thanks
Cause
A possible cause for this problem is that TCP/IP is not properly enabled on your DB2 database server.
Resolving the problem
Use the db2set DB2COMM command from the DB2 command window to start the TCP/IP connection:
db2set DB2COMM=protocol_names
For example, to set the database manager to start connection managers for the TCP/IP communication protocols, enter the following commands:
db2set DB2COMM=tcpip
db2stop
db2start
Source: https://www-304.ibm.com/support/docview.wss?uid=swg21403644