How to Fix Proxy Authentication Error 2606 in OneDrive, Outlook, and Microsoft Teams

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Getting error message Please check your proxy configuration and try again? Learn how to fix proxy authentication error 2606 with step-by-step solutions.

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proxy authentication error 2606

Many users encounter the Proxy Authentication Error 2606 while trying to sync their OneDrive, sign in to Outlook, or use Microsoft Teams. This error typically occurs due to proxy authentication failures, often after a password update or changes in network settings.

This blog post will explore what Proxy Authentication Error 2606 is, why it happens, and how to resolve it across different Microsoft applications, including OneDrive, Outlook, Teams, Excel, and Word. Follow the step-by-step solutions to restore seamless access to your Microsoft services.

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What Is a Proxy Authentication Error 2606?

A Proxy Authentication Error 2606 occurs when a Microsoft application, such as OneDrive, Outlook, or Teams, fails to authenticate through a proxy server. This typically happens due to:

• A recent password update that conflicts with saved credentials.
• Proxy server misconfigurations that prevent authentication.
• Corrupted Internet Explorer settings affecting Microsoft authentication.
• Windows security policies blocking access to Microsoft servers.
• Issues with Microsoft cloud authentication services that require re-signing in.

This error is particularly common after a password change, where users find OneDrive unable to sync, Outlook failing to connect, or Teams showing login issues.

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Common Scenarios Where Proxy Authentication Error Appears

1. Microsoft Proxy Authentication Error 2606 in OneDrive
   • Users report difficulty syncing their files, especially when switching between the OneDrive app and the Explorer version.
2. New Outlook Proxy Authentication Error 2606
   • After a password reset, Outlook refuses to connect, prompting an authentication error.
3. Proxy Authentication Error 2606 for Microsoft Teams
   • Some users find Microsoft Teams repeatedly asking for credentials but failing to authenticate.
4. Proxy Authentication Error 2606 in Windows 10 & 11
   • Users on both Windows 10 and Windows 11 experience authentication failures due to system proxy settings.
5. Proxy Authentication Error 2606 in Excel & Word
   • Some users find that Excel and Word fail to sync files stored on OneDrive due to proxy authentication failures.

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How to Fix Proxy Authentication Error 2606 in OneDrive, Outlook, and Teams

Solution 1: Sign Out and Reset Internet Explorer Settings

Microsoft authentication services rely on Internet Explorer settings for proxy authentication. Resetting these settings can resolve the issue.

Steps to Fix:

1. Sign out of your Microsoft account from OneDrive, Outlook, or Teams.
2. Open the Command Prompt by pressing Windows + R.
3. Type the following command and press Enter:CopyEditRunDll32.exe InetCpl.cpl,ResetIEtoDefaults
4. A prompt will appear—run the script without checking the box in the prompt.
5. Reopen OneDrive, Outlook, or Teams, then sign in again.

This method helps clear any authentication issues caused by proxy settings and cached credentials.

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Solution 2: Reconfigure Proxy Settings in Windows

If the error persists, manually adjusting the proxy settings in Windows may help.

Steps to Fix in Windows 10 & 11:

1. Open Settings (Win + I) and navigate to Network & Internet > Proxy.
2. Scroll down to Manual Proxy Setup and ensure the settings match your network’s configuration.
3. If you are unsure, disable proxy settings and try connecting again.
4. Restart your computer and check if the issue is resolved.

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Solution 3: Clear Stored Credentials in Windows

Sometimes, outdated credentials stored in Windows Credential Manager can cause authentication errors.

Steps to Fix:

1. Open Control Panel and navigate to Credential Manager.
2. Click on Windows Credentials and locate any saved Microsoft Office, OneDrive, or Teams credentials.
3. Remove outdated credentials related to your Microsoft account.
4. Restart your computer and sign in again.

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Solution 4: Update Windows and Microsoft Office

If the problem is widespread, outdated system files might be causing it.

Steps to Fix:

1. Open Settings > Update & Security and check for updates.
2. Install any available Windows updates.
3. Open Microsoft Office (Outlook, Excel, Word, Teams) and update them from the File > Account > Update Options menu.
4. Restart your computer and verify if the issue is resolved.

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Solution 5: Check Firewall and Security Software

Sometimes, firewall settings may block Microsoft authentication.

Steps to Fix:

1. Open Windows Security (Win + S, type Windows Security).
2. Navigate to Firewall & Network Protection.
3. Temporarily disable your firewall and check if the error disappears.
4. If disabling the firewall fixes the issue, create an exception for Microsoft services.

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Solution 6: Reinstall OneDrive, Outlook, or Teams

If all else fails, reinstalling the affected Microsoft application can resolve deeper authentication issues.

Steps to Fix:

1. Open Control Panel > Programs & Features.
2. Locate OneDrive, Outlook, or Teams, then uninstall them.
3. Restart your computer and reinstall the application from Microsoft’s official site.
4. Sign in again and check if the issue is resolved.

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Proxy Authentication Example: How Proxies Affect Microsoft Services

A proxy authentication error happens when a network proxy asks Microsoft applications to verify credentials but fails to do so. For example, corporate networks often use proxy servers for security, and incorrect configurations can prevent OneDrive or Outlook from authenticating properly.

Some users also experience errors when switching networks, such as moving from home Wi-Fi to a company VPN. In such cases, manually updating the proxy settings or reconnecting can resolve the issue.

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Final Thoughts

The Proxy Authentication Error 2606 can disrupt OneDrive syncing, Outlook connectivity, and Teams login. By following the solutions outlined in this guide, you can troubleshoot and resolve the issue effectively.

To summarize:

• First, sign out and reset Internet Explorer settings.
• Check and update proxy settings in Windows.
• Clear outdated credentials stored in Windows Credential Manager.
• Update Windows and Microsoft Office.
• Check firewall settings and create exceptions if necessary.
• If nothing works, reinstall OneDrive, Outlook, or Teams.

By implementing these fixes, you should be able to regain access to your Microsoft services without proxy authentication errors.

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