HOST NOT RESOLVABLE seen ONLY for FIRST request with RemoteWebDriver - docker

Question

HOST NOT RESOLVABLE seen ONLY for FIRST request with selenium-server-standalone 2.41(Machine A) RemoteWebDriver, Firefox 28 on Machine B alone with hub and node on the same MACHINE B.
The debugging session is going on from two days with no concrete outcome. Can anyone please point us in the right direction?
Are we missing anything as part of setup here? What is the correct way to make use of selenium-server-standalone 2.41 with Firefox 28 for RemoteWebDriver usecase?
Maven Dependency
<dependency>
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-server-standalone</artifactId>
<version>2.41.0</version>
</dependency>
SETUP AND EXECUTION DETAILS
We have two machines Machine A (ARM64) , Machine B(Linux X86).
The way we are making use of it now is as follows,
Machine A(Linux ARM64) is where RemoteWebDriver invocation occurs, selenium-server-standalone-2.41.0.jar is used.
Machine B(Linux x86), we have a running docker container acts as both hub and node, Expose 4444 port from CONTAINER to HOST MACHINE B
java -jar /u01/selenium/selenium-server-standalone-2.44.0.jar -role hub
java -jar /u01/selenium/selenium-server-standalone-2.44.0.jar -role node -hub http://localhost:4444/grid/register
Access the HOST:port from ARM based machine
OUTPUT SEEN
First connection results in WebDriver Exception, HOST NOT RESOLVABLE, however, subsequent connetions results in no expections, everything just works after first request failure. Here, Geckodriver is not used as we are making use of selenium 2.41, as per MOZ documention
https://firefox-source-docs.mozilla.org/testing/geckodriver/Support.html
CODE USED
The below code is executed from MACHINE A.
import java.net.MalformedURLException;
import java.net.URL;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.remote.DesiredCapabilities;
import org.openqa.selenium.remote.RemoteWebDriver;
public class Main {
public static void main(String[] args) throws Exception {
DesiredCapabilities capability = DesiredCapabilities.firefox();
WebDriver driver = new RemoteWebDriver(new URL("http://<<MACHINEB>>:4444/wd/hub"), capability);
driver.manage().window().maximize();
driver.get("http://localhost:4444");
Thread.sleep(10000);
driver.close();
}
}

Answer 1

I guess the issue here is not with your Selenium code rather with the server you are calling. Probably it is initially "sleeping" and "wakes up" after it detects some request coming to it.