Lambdatest a Cloud base Cross Browser Testing Platform


What is LambdaTest?

LambdaTest is a cloud-based cross-browser testing platform that handles all of your website and web application testing needs. With manual, visual, and automated testing capabilities, you can ensure that your web app elements (such as JavaScript, CSS, HTML5, Video, and so on) render smoothly across every desktop and mobile web browser.

LambdaTest provides cloud access to up to 2000+ combinations of desktop and mobile browsers. Furthermore, LambdaTest provides the LT browser, a developer-oriented tool for evaluating the responsiveness of a website.

With over 25+ devices to choose from, interactive developer tools, and scroll sync, LT Browser has greatly simplified mobile website testing. You can even create your own custom devices using localhost URLs without the use of extensions or tunnels.

Selenium Grid is compatible with any test automation framework that supports Selenium bindings, including those for Java, JavaScript, C#, Ruby, PHP, and Python. Our desktop and mobile testing automation services assist you in automating your desktop and mobile web testing workflows.

LambdaTest allows you to run parallel test sessions at the same time, reducing test cycles and increasing efficiency. LambdaTest supports one-click bug logging into various bug management tools such as Jira, Asana, Trello, Github, Paymo, TeamWork, Mantis, Hive, and others directly from the LambdaTest platform.

Key benefits of using LambdaTest
  • Automation of Selenium Web Testing
  • Test Mobile Web Applications Using Selenium Grid
  • Browser compatibility testing in real-time
  • Automated screen capture testing for faster results
  • You can use the LT browser app to test two devices simultaneously by scrolling Sync
  • A Faster Go-to-Market Launch With Parallel Testing
  • Testing API for Continuous Integration
Continual testing with continuous integration tools

Selenium Automation Grid is a Selenium infrastructure that is secure, dependable, and scalable for performing end-to-end automation tests. Selenium scripts enable automated cross-browser testing on over 2000 browsers and operating systems, resulting in higher test coverage and significantly reduced build time.

You can use LambdaTest to see how well your web application renders in various browsers. You can automate cross-browser testing of your locally hosted web pages with LambdaTest Tunnel. You can also run a single test on multiple browsers and OS configurations at the same time. You can quickly begin automating your Selenium tests by using the LambdaTest Selenium automation grid.

The Lambda Test tool, according to users, is the best and most reliable to use. Because LambdaTest Screenshots provide a full-page screenshot that simplifies their life, screenshots are useful. The tool assists them in testing browser compatibility on Mac OS and iPhone devices. The tool's main advantage is its integration feature, which allows them to directly log issues discovered on Lambdatest.

LambdaTest Tunnel troubleshooting

LambdaTest Tunnel creates an SSH connection between your local computer and our cloud servers in order to perform tests on locally hosted websites and web apps. You can use LambdaTest Tunnel to test the robustness of your website across 3000+ real browsers before it goes live.

This document will assist you in troubleshooting the most common issues that may arise if you are unable to perform cross-browser testing using LambdaTest Tunnel.

That is an error! Have difficulties testing your locally hosted application via LambdaTest Tunnel? Follow these instructions.

Here are some common issues to consider before we proceed:
  • Connecting to localhost failed
  • The host header is invalid
  • There is a problem loading CSS in WordPress
  • Whitelisting IP addresses
  • There is no available PORT
  • Creating a custom hostname
  • The Console User Interface (CUI)
  • The connection through port 443 to the secure shell tunnel could not be established
  • The LT file cannot be opened by Apple because it cannot be scanned for malware

1. Connection refused by localhost

After configuring the tunnel, you may encounter an error similar to the one shown below:

Using localhost as a URL is incompatible with a number of browsers and browser versions, resulting in a failure to connect to Localhost. Localhost is replaced with or your local IP address on purpose.

However, the URLs or would both work perfectly well for you.

2. Host header is invalid

When testing an application hosted on your local machine, you may receive an "Invalid Host Header" error message. The most common cause of this error is an application server misconfiguration, which causes it to reject connections from nonlocal hosts or requests directed to hostnames other than localhost.

Today, web applications are built with a variety of frameworks such as angular, react, and others. To test them through the tunnel, change the command used to run your web app in your project manifest, which is the "package.json" file.

In the case of the Angular framework project, you should ideally run your web application using "ng serve" or "npm start," or set the package.json configuration to "ng serve" to start it locally. However, this may cause a Real-Time Test to fail with an "Invalid Host Header" error.

I have a quick solution for you. Instead of changing your running command, use ng serve —host —disable-host-check or set your start configuration in package.json to "ng serve —host —disable-host-check" to run your application.

When creating a React framework web application, you must include the hostname in the env file.

The syntax is HOST=* hostname >; after that, you can add your localhost IP address as well as your hostname to your system host file.

3. CSS not loading in WordPress

You may run into issues with CSS rendering when testing a local web app built with WordPress. See the following screenshot:

In general, you should update the WordPress Address and Site Address on the General Settings tab in the WordPress dashboard with your system IP address rather than localhost, then everything will be emitted according to that address. See the screenshot below for further reference.

4. IP Whitelisting

Setting up a local testing connection and whitelisting the IPs listed below for a domain that requires IP whitelisting is all you need to do when testing a server that requires IP whitelisting.

However, be advised, that as we are aggressively adding more and more data centers, these IPs will be changed. You can see the updated IPs in this documentation as well.

5. No available ports were found

Lambdatest a Cloud base

Whenever the LambdaTest Tunnel binary is started, it attempts to find free ports sequentially from 9090 to 9094, and if it cannot find any free ports, then it throws an error message "No available port found in 5 attempts."

Either your system has more than five tunnels running simultaneously or the ports that the tunnel is trying to access are already occupied by another application.

6. Custom Host Name

It is possible to change the IP address that you use to resolve a domain name with the host's file. Your computer will only be affected by this change without having an impact on how the domain is resolved globally.

Using this technique will allow you to see what your website will look like on a different server without changing your domain's DNS settings.

If you are using an operating system other than Windows, you can find the host's file at:

Windows – SystemRoot > system32 > drivers > etc > hosts By default the system root is C:\Windows, so if you are using Windows, your host's file is most probably:
  • C:\Windows\System32\drivers\etc\ hosts)
  • Linux – /etc/hosts
  • Mac OS X – /private/etc/hosts
Consider the case where you would like to resolve to You would need to open the host's file with a text editor and add the following line:

7. Still having trouble? We can help through our console interface (CUI)

Our tunnel has been upgraded with CUI (Console UI). You can use the CUI to present detailed information within your cmd/terminal console to help you see what is wrong with the SSH connection.

As the SSH connection established through LambdaTest Tunnel is updated in real-time, these logs will be updated in real-time as well. Such cases will result in the below logs being generated in the CUI.

8. Unable To Establish A Secure Shell Tunnel Connection Through Port 443

Port 443 is used for secure web browser communication. Web servers offering to accept and establish secure connections listen on this port for connections from web browsers desiring strong communication security.

For example, Port 443 is a standard port for routing traffic to However, if this port is unable to establish a secure shell tunnel connection, you might receive an error message shown in the below screenshot.

In such a case, you can switch to Port 22, which is a default SSH port and is used for Secure Shell (SSH) communication and allows remote administration access to the VM. To switch to Port 22 from Port 443, you can append -customSSHPort 22 to your usual.

9. LT Can’t Be Opened Because Apple Can Not Check It For Malicious Software.

Users may get the below error from the command line while trying to configure the LambdaTest Tunnel to test their locally hosted web pages: “LT can’t be opened because Apple cannot check it for malicious software”

This error occurs due to the increased restrictions on third-party software, downloaded from the internet. Since Catalina OS was recently launched by Apple, we are working to make our LambdaTest Tunnel compatible with the new OS.