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About java RMI. How to use LocateRegistry to getRegistry in a remote host with specified port?


About java RMI. How to use LocateRegistry to getRegistry in a remote host with specified port?

By : raulpuro
Date : November 21 2020, 07:38 AM
To fix this issue
how can I register a Registry in a remote host with specified port?
code :
LocateRegistry.createRegistry(6600);
// Register communication route
Naming.rebind("rmi://0.0.0.0:6600/PersonService", personService);
LocateRegistry.getRegistry("202.114.70.31", 6600);
Naming.rebind("rmi://202.114.70.31:6600/PersonService", personService);


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Multiple SSH reverse port tunnels on the same remote host and port

Multiple SSH reverse port tunnels on the same remote host and port


By : Rafik Zaidi
Date : March 29 2020, 07:55 AM
it fixes the issue I've spent some time playing around with this question. I now believe the premise that the remote SSH tunnels are all setup to work with the same port on the remote server is mistaken.
But after trying out some proof of concept stuff, I think I know vaguely what they're doing.
code :
server {
    listen 80;
    server_name xcvs.myserver.com;

    location / {
        proxy_pass http://127.0.0.1:5222;
    }
}


server {
    listen 80;
    server_name csde.myserver.com;

    location / {
        proxy_pass http://127.0.0.1:5223;
    }
}
$ localtunnel 3000
Port scanning in Scala: Application hangs for a closed port on the remote host

Port scanning in Scala: Application hangs for a closed port on the remote host


By : user2172926
Date : March 29 2020, 07:55 AM
this one helps. I've been trying to create an application which needs to scan open ports on a network (mostly LAN) as fast as possible. , Something like
code :
import scala.concurrent.{Future, Await}
import scala.concurrent.duration._
import scala.util.Try
import scala.concurrent._
import java.util.concurrent.Executors

implicit val ec = ExecutionContext.fromExecutor(Executors.newFixedThreadPool(100)) 

def openPorts(address:String ="127.0.0.1",duration:Duration = 10 seconds, fromPort:Int = 1, toPort:Int = 65536) = {
 val socketTimeout = 200
 val result = Future.traverse(fromPort to toPort ) { port =>
  Future{ Try {
    val socket = new java.net.Socket()
    socket.connect(new java.net.InetSocketAddress(address, port),socketTimeout)
    socket.close()
    port
  } toOption } 
 } 
 Try {Await.result(result, duration)}.toOption.getOrElse(Nil).flatten
}


scala> val localPorts openPorts(fromPort = 10, toPort = 1000)
localPorts: scala.collection.immutable.IndexedSeq[Int] = Vector(22, 631)
scala> val remotePorts = openPorts(fromPort = 10, toPort = 1000, address="192.168.1.20")
remotePorts: scala.collection.immutable.Seq[Int] = List() //we ate the timeout

scala> val remotePorts = openPorts(fromPort = 12000, toPort = 13000, address="91.190.218.61", duration=30 seconds)
remotePorts: scala.collection.immutable.Seq[Int] = Vector(12345, 12350)
Why doesn't LocateRegistry.getRegistry() fail if I specify the wrong port number?

Why doesn't LocateRegistry.getRegistry() fail if I specify the wrong port number?


By : user3269847
Date : March 29 2020, 07:55 AM
will help you Just getting a result from LocateRegistry.getRegistry() doesn't indicate that you're connected to anything. It doesn't perform any network operations. It just constructs a stub. If the port number isn't correct, you won't find out until you try to use it.
Is it possible to open JVM remote debug port only to one remote host?

Is it possible to open JVM remote debug port only to one remote host?


By : Bryan Sandoval
Date : March 29 2020, 07:55 AM
this will help The debugging protocol is insecure, you should not allow any remote machines to connect. Bind it to localhost and tunnel over SSH, that way you can also manage authentication via SSH.
In a multi-user environment localhost may be insecure too, in that case you will also use the password authentication mechanism in addition to tunneling through SSH.
Could not connect to SMTP host: {remote-server}, port: {port}, response: -1

Could not connect to SMTP host: {remote-server}, port: {port}, response: -1


By : hbetts3
Date : March 29 2020, 07:55 AM
wish helps you A response code of -1 means that JavaMail failed to get a valid response code from the SMTP server. You can view the relevant source here.
Most likely, you either have your properties set incorrectly or you have a networking issue such as a firewall blocking the connection.
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