Fix Connection Error: How to Resolve Unable to Connect to Host on Port 7055 Issue

Facing the error "Unable to connect to host on port 7055"? Don't worry! In this guide, we'll provide you with a step-by-step solution on how to fix this connection issue to get your system up and running.

Table of Contents

  1. Introduction
  2. Causes of the Error
  3. Step-by-Step Solution
  4. FAQs
  5. Related Links


The error "Unable to connect to host on port 7055" is a common issue experienced by developers, particularly when working with Selenium WebDriver. This error prevents the Selenium server from establishing a connection with the Firefox browser or other WebDriver supported browsers.

Causes of the Error

There are several reasons why you might encounter this error:

  1. Incompatibility between Selenium WebDriver and Firefox browser versions.
  2. A firewall or antivirus software is blocking the connection.
  3. Incorrect configuration settings for your Selenium server or network.

Step-by-Step Solution

Follow these steps to resolve the "Unable to connect to host on port 7055" error:

Check Selenium WebDriver and Firefox browser compatibility: Ensure that you are using compatible versions of Selenium WebDriver and Firefox browser. You can check the compatibility matrix on the official Selenium website.

Update Selenium WebDriver and Firefox browser: If your current versions are not compatible, update both Selenium WebDriver and Firefox browser to the latest compatible versions.

Disable firewall or antivirus software: Temporarily disable any firewall or antivirus software that may be blocking the connection. If the issue is resolved, add an exception for the Selenium server in your firewall or antivirus settings.

Check Selenium server configuration: Ensure that your Selenium server is configured correctly by verifying the server's address, port number, and other settings. You can find detailed instructions in the official Selenium documentation.

Check network settings: If you are still facing the issue, check your network settings and ensure that port 7055 is not blocked by any network rules or firewalls.

By following these steps, you should be able to resolve the "Unable to connect to host on port 7055" error and establish a connection between your Selenium server and Firefox browser.


Q1: Can I use a different port instead of port 7055?

Yes, you can use a different port by specifying the desired port number while starting the Selenium server. For example, use the command java -jar selenium-server-standalone.jar -port 1234 to start the server on port 1234.

Q2: How do I check if port 7055 is blocked?

To check if port 7055 is blocked, you can use the telnet command in your command prompt or terminal: telnet 7055. If the port is open, you should see a message indicating a successful connection. If not, the port may be blocked.

Q3: What are some alternatives to Selenium WebDriver?

Some popular alternatives to Selenium WebDriver include Cypress, Puppeteer, and Playwright.

Q4: Can I use Selenium WebDriver with other browsers besides Firefox?

Yes, Selenium WebDriver supports various browsers such as Google Chrome, Microsoft Edge, Safari, and Opera. You can find the respective browser drivers on the official Selenium website.

Q5: Can I use a proxy server with Selenium WebDriver?

Yes, you can configure Selenium WebDriver to use a proxy server by specifying the proxy settings in the WebDriver instance. For more information, refer to the official Selenium documentation.

By following this guide, you should now be able to resolve the "Unable to connect to host on port 7055" error and continue developing and testing your applications with Selenium WebDriver.

Great! You’ve successfully signed up.

Welcome back! You've successfully signed in.

You've successfully subscribed to

Success! Check your email for magic link to sign-in.

Success! Your billing info has been updated.

Your billing was not updated.