How to Fix ADP Error Code 100 in 2024? [10 Solutions]

It happened to me a few weeks ago – I was trying to log into my ADP account when suddenly, I found myself staring at the dreaded ADP Error Code 100 on my screen. Panicking, I rummaged through every online resource possible, desperately trying to fix this error code and regain control of my payroll management.

As it turns out, dealing with this error isn’t as daunting as it seems. Through trial and error, I have discovered a host of potential solutions that can help you resolve this issue without losing your mind. In this blog post, I’ll share these insights in the hopes that you can learn from my experience and tackle ADP Error Code 100 like a pro!

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What Does ADP Error Code 100 Mean?

What Does ADP Error Code 100 Mean?

ADP Error Code 100 is a common error message that users may encounter when attempting to access their ADP accounts, a platform widely used by businesses for payroll, tax, and benefits administration. The error indicates that there is an issue with the user’s login credentials or the account configuration.

Essentially, it’s the system’s way of telling you that something isn’t quite right and preventing further access until the problem is resolved. This error can manifest for several underlying reasons, such as incorrect username or password, temporary account lockouts due to excessive failed login attempts, incorrectly configured browser settings or cache issues, and even occasional glitches on ADP’s end.

Whatever the root cause may be, identifying and addressing it promptly should remain a top priority to minimize potential disruption to your day-to-day business operations.

How To Fix ADP Error Code 100 in 2024?

How To Fix ADP Error Code 100 in 2024?

1. Double-check your login credentials

Double-check your login credentials - Fix ADP Error Code 100

One of the most common reasons for encountering error is entering incorrect login credentials. While it may seem like basic advice, double-checking your username and password is a crucial first step in resolving the error. Use the following steps to ensure that you’re using the correct details when logging into your ADP account:

  • Step 1: Locate your credentials – Your username and password might be provided by your employer or assigned by ADP when you enrolled. Make sure you have the correct information available before attempting to log in.
  • Step 2: Pay attention to case sensitivity – Most website login systems, including ADP, are case-sensitive regarding passwords. This means that “Password” and “password” will be treated as two entirely different strings of characters. Make sure you’re entering your password exactly as it was originally set up, taking note of any capitalizations or special characters.
  • Step 3: Enter your username accurately – Usernames are often linked to an employee’s email address or a unique identifier provided by the company. Ensure that you’re using the proper format for your username (e.g., [email protected] or employeeID) when attempting to log in.
  • Step 4: Avoid copy-pasting – Typing out credentials manually instead of copy-pasting may help avoid any unforeseen formatting errors that could result in incorrect credential entry.

2. Reset your password

Reset your password - Fix ADP Error Code 100

If you’re sure about entering the correct username but still face ADP Error Code 100, it’s possible that you’ve forgotten your password or entered it incorrectly. In that case, it’s best to reset your password to regain access to your account. Follow these simple steps to reset your ADP password:

1. Navigate to the ADP login page

Access the ADP login page by visiting their official website at

2. Click on ‘Forgot your Password?’

On the login page, locate and click on Forgot your Password? link just below the password input field.

3. Enter your registered email address

You’ll be redirected to the password reset page. Here, provide the email address linked to your ADP account and click Next.

4. Follow the instructions provided in the email

ADP will send an email containing a link to create a new password. Open the email and click on that link.

5. Create a new, secure password

Follow any prompted instructions for creating a secure password. Make sure to use a combination of letters (uppercase and lowercase), numbers, and special characters for enhanced security.

6. Log in with your new credentials

After setting up your new password, return to and try logging in with your new credentials. This should resolve error if incorrect password entry was indeed the issue.

3. Clear browser cache and cookies

Clear browser cache and cookies - Fix ADP Error Code 100

Clearing your browser’s cache and cookies can help resolve ADP Error Code 100 by removing any stored data that might interfere with the ADP login process. As you browse the web, your browser stores temporary files, images, and bits of information from various websites to enhance user experience.

However, this data can sometimes become outdated or corrupted, causing errors when trying to access certain websites like ADP. Below are the steps to clear cache and cookies in some popular browsers:

Google Chrome

  1. Click on the three-dot icon in the top-right corner of your browser window.
  2. Choose ‘Settings,’ and under ‘Privacy and Security’ select ‘Clear browsing data.’
  3. From the ‘Basic’ tab, ensure that the ‘Cookies and other site data’ and ‘Cached images and files options are checked.
  4. Click on ‘Clear Data.’

Mozilla Firefox

  1. Navigate to the menu button (three horizontal lines) in the top-right corner.
  2. Select ‘Options,’ then click on ‘Privacy & Security.’
  3. Under the ‘Cookies and Site Data’ section, click on ‘Clear Data.’
  4. Check both options for ‘Cookies and Site Data’ as well as ‘Cached Web Content,’ then click on the ‘Clear’ button.

Microsoft Edge

  1. Click on the three-dot icon in the top-right corner of your browser window.
  2. Choose ‘Settings,’ then select ‘Privacy & Security.’
  3. Locate ‘Choose what to clear’ under the ‘Browsing data’ section.
  4. Ensure that both ‘Cookies and saved website data’ as well as ‘Cached data and files’ are checked before clicking on ‘Clear.’


  1. On Safari’s menu bar at the top of your screen, click on ‘Safari.’
  2. Choose ‘Preferences,’ then go to the ‘Privacy’ tab.
  3. Click on ‘Manage Website Data.’
  4. Select ‘Remove All’ and confirm by clicking on ‘Remove Now.’

After clearing your browser’s cache and cookies, try logging into your ADP account again. This solution may fix the error if the issue stemmed from outdated or corrupted cached data.

4. Update your internet browser

Update your internet browser - Fix ADP Error Code 100

Regularly updating your internet browser is crucial to ensure that it’s compatible with the latest web standards and functionalities, including ADP’s login system. An outdated browser may have compatibility issues leading to errors.

To update your browser, follow the steps below according to the browser you use:

Google Chrome

  1. Open Chrome on your computer.
  2. Click on the three-dot menu in the top-right corner of the screen.
  3. Scroll down and click on Settings.
  4. In the Settings page, scroll down and click on About Chrome (or type chrome://settings/help in the address bar).
  5. Chrome will automatically check for updates and allow you to install a new version if there’s one available.

Mozilla Firefox

  1. Open Firefox on your computer.
  2. Click on the hamburger menu in the top-right corner of the screen.
  3. Scroll down and click on Help, then select About Firefox.
  4. A new window will appear, where Firefox will automatically check for updates and allow you to install a new version if there’s one available.

Microsoft Edge

  1. Open Microsoft Edge on your computer.
  2. Click on the three-dot menu in the top-right corner of the screen.
  3. Scroll down and click on Settings.
  4. In the Settings page, go to About Microsoft Edge (or type edge://settings/help in the address bar).
  5. The browser will automatically check for updates and allow you to install a new version if there’s one available.

After updating, be sure to restart your browser and try logging into your ADP account once again.

5. Disable browser extensions or add-ons

Disable browser extensions or add-ons - Fix ADP Error Code 100

Browser extensions and add-ons can sometimes interfere with ADP’s web-based platform, leading to the Error Code 100 in ADP. Disabling these extensions temporarily allows you to identify if any of them are causing the issue and helps you regain access to your account.

By following the steps outlined below, you can easily disable browser extensions and add-ons for some of the most commonly used browsers:

Google Chrome

  1. Open Google Chrome and click on the three-dot menu icon located in the upper-right corner of your browser.
  2. Select More Tools from the menu list and click on Extensions.
  3. Here, you will see a list of all active extensions. To disable them, toggle off the blue switch next to each extension.
  4. Close and restart your browser before attempting to log in to ADP again.

Note: You can enable the extensions once you have identified if any were causing issues with ADP.

Mozilla Firefox

  1. Open Mozilla Firefox and click on the three horizontal lines icon (hamburger menu) in the top-right corner.
  2. Now, select Add-ons & Themes from the drop-down list that appears.
  3. Click on Extensions from the sidebar menu, where you will see a list of active add-ons.
  4. To disable them individually, click on Disable or Toggle off next to each extension name.
  5. Restart Firefox before trying to log back into your ADP account.

Microsoft Edge:

  1. Open Microsoft Edge, and click on the three-dot menu icon positioned at the top-right corner.
  2. Choose Extensions from the options that appear.
  3. Within this window, locate each actively running extension, then disable it by clicking on its corresponding toggle switch until it turns gray.
  4. Close and relaunch the Microsoft Edge browser before attempting to access your ADP account.

Remember to disable extensions one by one to help identify if a specific extension is conflicting with the ADP platform. Once you’ve pinpointed the troublesome extension, remember to re-enable the others. If this solution doesn’t resolve your issue, continue exploring the remaining solutions outlined in this blog post.

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6. Enable JavaScript and cookies in browser settings

Enable JavaScript and cookies in browser settings - Fix ADP Error Code 100

Enabling JavaScript and cookies in your browser settings is an essential step to ensure the seamless functionality of websites like ADP. Both are critical components for web applications to work correctly, as they store data and provide interactive features.

Disabling them might cause errors like the ADP Error Code 100 while trying to access your account. In this section, let’s go through the steps to enable JavaScript and cookies for various popular browsers.

Google Chrome

  1. Open Google Chrome and click on the three vertical dots at the top right corner.
  2. Select Settings from the dropdown menu.
  3. Scroll down and click on Privacy and Security, then choose Site Settings.
  4. To enable JavaScript, click on JavaScript and switch on the toggle for Allowed (Recommended).
  5. To enable cookies, go back to Site Settings and click on Cookies and Site Data. Switch on the toggle to Allow all cookies.

Mozilla Firefox

  1. Open Mozilla Firefox and click on the three horizontal lines at the top right corner.
  2. Click on Options or Preferences, depending on your OS (Windows or macOS).
  3. Select Privacy & Security from the left sidebar.
  4. In the Cookies and Site Data section, make sure that there is no checkmark next to ‘Delete cookies when Firefox is closed’, if it is checked uncheck it.
  5. Scroll down to locate [Firefox will:]. Set it as ‘Use custom settings for history’, then check ‘Accept cookies from websites’.

Microsoft Edge

  1. Open Microsoft Edge, click on the three dots located at the top-right, then select “Settings”
  2. Click on “Privacy, search, and services”
    3. Select the appropriate cookie settings, ideally ‘Allow all cookies’ for a trouble-free ADP experience.
  3. Scroll down to the Additional Content Settings, click on “Javascript”, and make sure it is switched on.

Safari (macOS)

  1. Open Safari and click on Safari at the top left corner next to the Apple logo.
  2. Select Preferences.
  3. Click on the Privacy tab.
  4. Locate “Cookies and website data“, and set it to ‘Always Allow‘ or ‘Allow from websites I visit’.
  5. In order to enable JavaScript, switch to the Websites tab, click on Security in the left sidebar, then check ‘Enable JavaScript’.

Enabling JavaScript and cookies might resolve error for you; once done, try accessing your account again, if you are still facing issues, please proceed with other solutions mentioned in this article.

7. Switch to a different internet browser

Switch to a different internet browser - Fix ADP Error Code 100

The error could be a result of compatibility issues or technical glitches within a specific internet browser. Switching to another browser may resolve the error, allowing you to access your ADP account seamlessly. To make this transition easier, follow these simple steps:

1. Choose an alternative browser

The first step is to decide on another popular internet browser that meets ADP’s system requirements. Here are some widely used options:

These browsers all have their unique features and advantages, so it’s worth trying out the one that best suits your preferences and system configuration.

2. Download and install the selected browser

Next, visit the official website of your chosen alternative browser using your current internet browser. Download the latest version and follow each installation prompt to set up the new browser successfully.

3. Import bookmarks, history, and settings (optional)

Before diving into your new browsing experience, you may want to import bookmarks, browsing history, or settings from your current browser. Most modern browsers offer an easy method for importing this data:

Google Chrome: Click on three vertical dots in the top-right corner > Bookmarks > Import bookmarks and settings > Select current browser > Check items you want to import > Click Import.

Mozilla Firefox: Click on three horizontal lines in the top-right corner > Library > Bookmarks > Show All Bookmarks > Import and Backup > Import Data From Another Browser.

Microsoft Edge: Click on three horizontal dots in the top-right corner of Edge window> Favorites> Manage favorites> Select ‘Import’ from options located under ‘Add favorite’> Choose desired browser> Import.

Apple Safari: Click on File > Import From > (Select your current browser) > Choose the items you want to import > Click Import.

4. Log in to ADP

With your new browser ready, navigate to the ADP login page, enter your login credentials, and attempt to sign in. There’s a good chance that switching browsers will resolve the ADP Error Code 100 issue and grant you access to your account.

Keep in mind that ADP continually updates its platform for optimal performance. Therefore, it’s essential always to keep your browser up-to-date and follow best practices for enhancing security and user experience.

8. Check for network connectivity issues

Check for network connectivity issues - Fix ADP Error Code 100

Sometimes the cause of the Error Code 100 in ADP is not directly related to your account or browser settings, but rather, it is due to network connectivity issues.

These can either be a result of problems with your internet service, Wi-Fi connections, or even temporary server issues on ADP’s end. Here are some steps you can take to troubleshoot and resolve network-related issues:

1. Restart your modem and router

Power cycling your modem and router can help refresh your internet connection, potentially resolving any connectivity hiccups you may be experiencing. To do this, unplug both devices from their power sources, wait 30 seconds, then plug them back in. Allow a few minutes for the devices to fully reboot and establish a connection.

2. Verify Wi-Fi connection

If you’re using a Wi-Fi connection, confirm that you are connected to your preferred network and that the signal strength is adequate. You might also try moving closer to the router or accessing ADP from a device connected via ethernet cable for more stable connectivity.

3. Check for outages

Occasionally, your Internet Service Provider (ISP) may experience outages that can disrupt access to various online services. Visit your ISP’s website or contact their customer support team to inquire about any known outages or ongoing maintenance that could be impacting your connection.

4. Perform a speed test

You can use an online speed test tool like or to determine if your internet speed is adequate for accessing ADP and other online services. If the results indicate slow speeds or high latency rates, consider contacting your ISP for assistance in improving performance.

5. Test other websites

Navigate to different websites (e.g., Google, YouTube) to confirm that the issue is not limited to ADP’s website. If you encounter difficulties on these sites as well, it could signify a more widespread connectivity problem.

6. Check ADP service status

On rare occasions, ADP’s servers may experience temporary downtimes due to maintenance or technical issues. Keep an eye on their Twitter account for updates about system status and possible service interruptions.

9. Verify ADP System Compatibility Requirements

Verify ADP System Compatibility Requirements - Fix ADP Error Code 100

One often overlooked aspect when troubleshooting error code is ensuring your system and browser meet the compatibility requirements set by ADP. This error could be a result of using outdated software or operating systems that are not compatible with ADP’s platform. To verify this, you will need to check the minimum system requirements for the optimal functioning of the ADP website.

Here are the steps to ensure your system meets these requirements:

1. Confirm Operating System Compatibility

For Windows Users:
  • Ensure you are running at least Windows 8.1 or later for optimal compatibility with ADP services. To check your current operating system, go to Settings > System > About.
For Mac Users
  • Make sure you have macOS Sierra (10.12) or later installed on your device. You can verify this by clicking on the Apple menu > About This Mac.

2. Review Browser Compatibility

Make sure you are using one of the supported internet browsers:

Google Chrome:

  • Version 71 or higher is recommended for Windows and Mac systems.

Mozilla Firefox:

  • Version 64 or higher is recommended for Windows and Mac systems.

Apple Safari:

  • Version 12 or higher is recommended for Mac systems only.

Please note that Internet Explorer isn’t supported and may not work properly with ADP services, so it’s best to use one of the above-listed browsers.

To check your browser version, visit Help > About section in Chrome or Firefox, or click Safari menu > About Safari in Safari.

3. Update Your Browser (If Necessary)

If you find that your current browser falls short of the required version, it’s time to update it:

  • Google Chrome:
    • Click on the three-dot menu in the top-right corner, then select Help > About Google Chrome. The browser will automatically check for updates and install them.
  • Mozilla Firefox:
    • Go to the menu button, and choose Help > About Firefox. Just like Chrome, it will auto-update if a newer version is available.
  • Apple Safari:
    • Mac users can update Safari by clicking on the Apple menu and selecting App Store > Updates.

After going through these steps and ensuring your system meets ADP’s compatibility requirements, try logging in again. If you still encounter ADP Error Code 100, move on to the next solution or contact ADP customer support.

10. Contact ADP Customer Support

Contact ADP Customer Support - Fix ADP Error Code 100

If you’ve tried all the above solutions and are still encountering error, it’s time to reach out to the experts at ADP customer support. Their team of knowledgeable professionals can help diagnose and resolve the issue as quickly as possible. Here are the steps that you can follow to contact ADP customer support:

1. Gather your account information

Before getting in touch with ADP customer support, ensure that you have your account information handy. This includes your company name, system ID, username or employee ID, and a brief description of the issue you’re facing.

2. Visit the ADP Contact Us page

Navigate to the official ADP Contact Us page at This page contains contact information for various ADP departments and will guide you to find the appropriate contact point based on your specific needs.

3. Select the appropriate category and product

On their Contact Us page, you’ll notice several categories such as Sales, Administrators & Employees, Media, and Partners. Based on your role as an employee or administrator, select the corresponding category.

Next, choose the appropriate product or service for which you need assistance (e.g., Payroll or Time & Attendance).

4. Choose a preferred contact method

ADP offers multiple ways to get in touch with its customer support team, including phone support and online chat services. Choose a method that fits your preference. For phone support, locate the appropriate phone number based on your product selection from Step 3.

For an online chat option, click on Start Chat Now within the selected category from Step 3.

5. Connect with a support representative

Whether using phone or chat, explain the issue you’re experiencing, including any troubleshooting steps you’ve already taken. Be sure to provide your account information detailed in Step 1. The support representative will then work with you until a solution has been reached.

By following these steps, you can make the most out of your interaction with ADP’s customer support team. Remember that reaching out for assistance is crucial not only for resolving the current issue but also for preventing potential future access problems and ensuring uninterrupted service. Your payroll management is vital, and ADP professionals are there to help keep everything running smoothly.

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ADP Error Code 100 can undoubtedly be a frustrating experience. However, armed with the knowledge shared in this blog post and the wide range of potential solutions listed above, you should now be better equipped to tackle this issue head-on. With each troubleshooting step, you’ll come closer to rectifying the problem and regaining access to your ADP account.

Technology isn’t flawless; glitches and errors are bound to happen from time to time. The key is being proactive and patient in resolving these issues when they arise. I hope that my personal experience with ADP Error Code 100 has provided valuable insight into resolving this error so that you can spend less time stressing about it and more time focusing on managing your business’s payroll and HR-related responsibilities effectively.

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