I am getting the following error when trying to access an exposed mbean process using JMX.
java.rmi.ConnectException: Connection refused to host: 10.65.13.201; nested exception is:
java.net.ConnectException: Connection refused: connect
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:601)
at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:198)
at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:184)
at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:322)
at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
at sun.tools.jconsole.ProxyClient.checkSslConfig(ProxyClient.java:217)
at sun.tools.jconsole.ProxyClient.<init>(ProxyClient.java:110)
at sun.tools.jconsole.ProxyClient.getProxyClient(ProxyClient.java:463)
at sun.tools.jconsole.JConsole$3.run(JConsole.java:510)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:529)
at java.net.Socket.connect(Socket.java:478)
at java.net.Socket.<init>(Socket.java:375)
at java.net.Socket.<init>(Socket.java:189)
at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:22)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:128)
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:595)
... 8 more
I am on a Unix server, and I am running using the following command:
java -jar MBeanSecure.jar
-Dcom.sun.management.jmxremote.access.file=jmxremote.access
-Dcom.sun.management.jmxremote
-Dcom.sun.management.jmxremote.port=1234
-Dcom.sun.management.jmxremote.local.only=false
-Dcom.sun.management.jmxremote.authenticate=false
-Dcom.sun.management.jmxremote.ssl=false
-Djava.security.auth.login.config=jaas-krb5.conf
-Dcom.sun.management.jmxremote.login.config=client
-Djava.rmi.server.hostname=10.65.13.201
com.ba.running.RunningImplem
My Hostname -i gives me:
$ hostname -i
10.65.13.201
All my config files are set to rw 0600, so this is:
jaas-krb5.conf
jmxremote.access
It appears to be specific to the Jaas config set up, because I am able to run the jar and access it fine when I use the following command:
java -jar
-Dcom.sun.management.jmxremote.port=1234
-Dcom.sun.management.jmxremote.password.file=jmxremote.password
-Dcom.sun.management.jmxremote.ssl=false
-Dcom.sun.management.jmxremote.access.file=jmxremote.access
-Dcom.sun.management.jmxremote=true MBeanSecure.jar
Then I am able to connect via jconsole without issue. So it doesn't appear to be a configuration setting on the server, I believe it's specific to my Jaas login module.
The jaas-krb5.conf:
client{
com.sun.security.auth.module.Krb5LoginModule required;
};
server{
com.sun.security.auth.module.Krb5LoginModule required
useKeyTab=false
storeKey=false
principal="principal#intranet.com";
};
I can confirm also that the Krb5LodingModule is working and communicating with the KDC accurately.
So there appears to be a misconfiguration with JMX when launching the jar, and my question is what that could be?
Solved:
incorrect launch script:
java -classpath MBeanSecure.jar
-Djava.rmi.server.hostname=<hostname>
-Dcom.sun.management.jmxremote=true
-Dcom.sun.management.jmxremote.port=<port>
-Dcom.sun.management.jmxremote.local.only=false
-Dcom.sun.management.jmxremote.authenticate=false
-Dcom.sun.management.jmxremote.ssl=false
-Djava.security.auth.login.config=../path/to/jaaskrb5.conf
-Djava.security.krb5.conf=../path/to/krb5.conf
-Dcom.sun.management.jmxremote.login.config=client
-Djava.net.preferIPv4Stack=true
-Dcom.sun.management.jmxremote.access.file=../path/to/jmxremote.access com.ba.running.RunningImplementation
Related
I run a docker postgres container via command line:
docker run --name some-postgres -p 5432:5432 -e POSTGRES_PASSWORD=passme -d postgres
But in IntelliJ I can't access this container
The following error message occurs:
[08001] Connection to localhost:5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
java.net.ConnectException: Connection refused: connect.
Do you know any problem, maybe with the port?
I am using Netbeans 8.2 with the Java EE Base 1.31.1 and EJB and EAR 1.27.1 plugins installed. I installed Tomcat 9.0.4 and added it as a server to Netbeans. Netbeans can successfully start the tomcat server and launch my web app, but it will not debug. When I attempt to debug my webapp, I get the following error in my webapp log:
ant -f /Users/jryan/JDev/SVN/trunk/Java/CollaborationServer -Dnb.internal.action.name=debug -Ddirectory.deployment.supported=true -DforceRedeploy=false -Dnb.wait.for.caches=true -Dbrowser.context=/Users/jryan/JDev/SVN/trunk/Java/CollaborationServer debug
init:
deps-module-jar:
deps-ear-jar:
deps-jar:
library-inclusion-in-archive:
library-inclusion-in-manifest:
compile:
compile-jsps:
debug:
Stopping Tomcat process...
Waiting for Tomcat...
Tomcat server stopped.
Starting Tomcat process...
Waiting for Tomcat...
Tomcat server started.
connect-debugger:
/Users/jryan/JDev/SVN/trunk/Java/CollaborationServer/nbproject/build-impl.xml:1206: The following error occurred while executing this line:
/Users/jryan/JDev/SVN/trunk/Java/CollaborationServer/nbproject/build-impl.xml:1216:
org.netbeans.api.debugger.jpda.DebuggerStartException: Connection refused (Connection refused)
at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.waitRunning(JPDADebuggerImpl.java:405)
at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.waitRunning(JPDADebuggerImpl.java:387)
at org.netbeans.api.debugger.jpda.JPDADebugger.attach(JPDADebugger.java:324)
at org.netbeans.modules.debugger.jpda.ant.JPDAConnect$1.run(JPDAConnect.java:235)
at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)
Caused by: java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at com.sun.tools.jdi.SocketTransportService.attach(SocketTransportService.java:222)
at com.sun.tools.jdi.GenericAttachingConnector.attach(GenericAttachingConnector.java:116)
at com.sun.tools.jdi.SocketAttachingConnector.attach(SocketAttachingConnector.java:90)
at org.netbeans.api.debugger.jpda.AttachingDICookie.getVirtualMachine(AttachingDICookie.java:231)
at org.netbeans.modules.debugger.jpda.actions.StartActionProvider.doStartDebugger(StartActionProvider.java:188)
at org.netbeans.modules.debugger.jpda.actions.StartActionProvider.access$200(StartActionProvider.java:80)
at org.netbeans.modules.debugger.jpda.actions.StartActionProvider$1.run(StartActionProvider.java:165)
... 4 more
BUILD FAILED (total time: 7 seconds)
The tomcat log says Listening for transport dt_socket at address: 8000
And the Netbeans Debugger Console says:
Attaching to localhost:8000
Connection refused.
Does anyone know what is happening here, and what I can do to fix it?
Thanks!
Perhaps try adding the flags detailed in this Answer.
This is how we currently do it.
Oops. It turns out that I had commented out the 127.0.0.1 localhost entry in my /etc/hosts file. When I re-enabled localhost, it worked fine! And as an aside, I thought I had to comment out the default localhost line because I had another line in there for a locally hosted site I was testing, but according to this answer, there's no need to do that!
I am using the following command to create a database using windows command and connect to it but I am getting java.net.SocketException: Unrecognized Windows Sockets error: 0: JVM_Bind error.
Command used to create a database named xdb and connect to it:
java -cp ./lib/hsqldb.jar org.hsqldb.Server -database.0 file:mydb -dbname.0 xdb
Complete error:
[Server#83cc67]: [Thread[main,5,main]]: checkRunning(false) entered
[Server#83cc67]: [Thread[main,5,main]]: checkRunning(false) exited
[Server#83cc67]: Startup sequence initiated from main() method
[Server#83cc67]: Loaded properties from [C:\Home\hsqldb\server.properties]
[Server#83cc67]: Initiating startup sequence...
[Server#83cc67]: [Thread[HSQLDB Server #83cc67,5,main]]: run()/openServerSocket(
):
java.net.SocketException: Unrecognized Windows Sockets error: 0: JVM_Bind
at java.net.PlainSocketImpl.socketBind(Native Method)
at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:365)
at java.net.ServerSocket.bind(ServerSocket.java:319)
at java.net.ServerSocket.<init>(ServerSocket.java:185)
at java.net.ServerSocket.<init>(ServerSocket.java:97)
at org.hsqldb.HsqlSocketFactory.createServerSocket(Unknown Source)
at org.hsqldb.Server.openServerSocket(Unknown Source)
at org.hsqldb.Server.run(Unknown Source)
at org.hsqldb.Server.access$000(Unknown Source)
at org.hsqldb.Server$ServerThread.run(Unknown Source)
[Server#83cc67]: Initiating shutdown sequence...
[Server#83cc67]: Shutdown sequence completed in 6 ms.
[Server#83cc67]: 2012-05-18 01:31:59.184 SHUTDOWN : System.exit() is called next
Could someone help me understand why am I getting this error and how to solve it?
Thanks
The default port for hsqldb is 9001
Run netstat -an check to see if there is something is LISTENING on port 9001
netstat -an | grep LISTENING to check for all servers listening for incoming connections
netstat -an | grep 9001 to check for a specific port number.
If there is something already there then the new of hsqldb that you are trying to start will fail to bind a socket to the 9001 port.
On Windows 7 you can run TCPView to see what process is currently listening on the "overcrowded" port. Then it's a matter of deciding to terminate that process which is using 9001 or reconfiguring hsqldb and your client application to use a different (unused) port.
It is possible to change the port that hsqldb listens on using the --port XXXX, where XXXX is the new port number.
Also from the java -cp ./lib/hsqldb.jar org.hsqldb.Server --help output...
The server looks for a 'server.properties' file in the current directory and loads properties from it if it exists. Command line options override those loaded from the 'server.properties' file.
There are other possible causes of this error so it would be useful to know what operating system the hsqldb is running on.
Failure to bind to a socket is a problem that can afflict any server application so you can review the answers provided for other server software that return this error such as the question asked about JBOSS here ...
java.net.SocketException: Unrecognized Windows Sockets error: 0: JVM_Bind (JBOSS)
It looks like you try to bind to port 0 and it doesn't exist. Try to config a different port
While trying to configure eclipse, tomcat to debug a maven project I am getting the following error:
Failed to connect to remote VM. Connection refused.
Connection refused
What am i doing wrong?
java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:432)
at java.net.Socket.connect(Socket.java:529)
at java.net.Socket.connect(Socket.java:478)
at java.net.Socket.<init>(Socket.java:375)
at java.net.Socket.<init>(Socket.java:189)
at org.eclipse.jdi.internal.connect.SocketTransportService$2.run(SocketTransportService.java:136)
at java.lang.Thread.run(Thread.java:680)
This basically means eclipse can't connect to the target tomcat. This may be due to tons of reasons:
tomcat isn't started
tomcat isn't accessible over the network
the debug port is not accessible (check firewall)
tomcat isn't configured to accept debugging (it should have something like the following in the startup script -Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n)
I have a cassandra cluster on 4 nodes (each running ubuntu 10.04 and cassandra 0.7.4).
All nodes are connected using a SWITCH, and each is assigned a STATIC IP ADDRESS (no DNS is involved).
The node seems to be functioning properly (status is 'Normal', all nodes are up etc).
The problem is this: nodetool works, yet it only works when the nodetool command is run on the same node. When I try to run nodetool from STATIC_IP = 192.168.0.253 on STATIC_IP = 192.168.0.4 I get the following error:
(note: machine 's3789' has the static IP of 192.168.0.253)
user#s3789:/opt/cassandra/apache-cassandra-0.7.4$ bin/nodetool -host 192.168.0.4 ring
Error connection to remote JMX agent!
java.rmi.ConnectException: Connection refused to host: 127.0.1.1; nested exception is:
java.net.ConnectException: Connection refused
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:619)
at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:216)
at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:128)
at javax.management.remote.rmi.RMIServerImpl_Stub.newClient(Unknown Source)
at javax.management.remote.rmi.RMIConnector.getConnection(RMIConnector.java:2343)
at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:296)
at javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:267)
at org.apache.cassandra.tools.NodeProbe.connect(NodeProbe.java:137)
at org.apache.cassandra.tools.NodeProbe.<init>(NodeProbe.java:107)
at org.apache.cassandra.tools.NodeCmd.main(NodeCmd.java:511)
Caused by: java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:327)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:193)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:180)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:384)
at java.net.Socket.connect(Socket.java:546)
at java.net.Socket.connect(Socket.java:495)
at java.net.Socket.<init>(Socket.java:392)
at java.net.Socket.<init>(Socket.java:206)
at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:40)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:146)
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:613)
Any hints how to solve this?
from conf/cassandra-env.sh:
# add this if you're having trouble connecting:
# JVM_OPTS="$JVM_OPTS -Djava.rmi.server.hostname=<public name>"
#
# see
# https://blogs.oracle.com/jmxetc/entry/troubleshooting_connection_problems_in_jconsole
# for more on configuring JMX through firewalls, etc. (Short version:
# get it working with no firewall first.)
Check if you started rmiregistry before starting the server
rmiregistry &
Getting started with RMI