QuickBooks Error 155: How to Fix Sync and Update Failures?

QuickBooks Error 155 appears when a user attempts to update bank feeds, payroll, or tax tables, and the update fails due to authentication or system-related issues. This error commonly relates to secure connection failures, blocked network ports, or incomplete software updates.

This article explains why Error 155 appears, how to identify it, and the best methods to fix it. You will also find ways to prevent it from recurring, tools that can help, and expert options if self-troubleshooting fails.

Watch this quick video to learn the causes and solutions for QuickBooks Error Code 155: Sync and Update Failures.

What is QuickBooks Error “155”?

QuickBooks Error 155 is a system-generated error that usually occurs during bank feed updates, payroll processing, or tax table updates. It is tied to a failed attempt by QuickBooks to complete a secure connection with Intuit servers or financial institutions.

The error may appear with the message:

“Error 155: Update failed. QuickBooks could not complete the request. Please try again later.”

This error stops users from proceeding with financial operations and can delay payroll or vendor payments.

Why does QuickBooks Error “155” occur?

QuickBooks Error 155 occurs due to reasons linked to security configurations, internet connectivity, and system file updates. Common causes include:

• Outdated digital certificates or expired security tokens
• Windows Firewall or antivirus blocking QuickBooks
• Corrupt or missing company file components
• Unstable internet connection
• QuickBooks not updated to the latest release

Any of these reasons can prevent QuickBooks from syncing securely with online services.

How can you identify QuickBooks Error “155”?

You can identify Error 155 by observing system prompts or functional issues during operations such as:

• Bank feeds failing to update
• Payroll setup showing connectivity failure
• QuickBooks freezing during tax table download
• Error 155 message pop-up during software update attempts

Check the log file (QBWin.log) for the exact error code or match the failure time with the system events in Event Viewer.

What are the steps to fix QuickBooks Error “155”?

To resolve QuickBooks Error 155, follow the steps below. Start with basic methods and move to advanced solutions if the issue persists.

Solution 1: Update QuickBooks to the Latest Version

Using an outdated version can trigger update errors. Follow these steps:

1. Open QuickBooks Desktop.
2. Go to Help > Update QuickBooks Desktop.
3. Click Update Now tab and select Reset Updates.
4. Click Get Updates.
5. Restart QuickBooks and install the updates when prompted.

Solution 2: Configure Windows Firewall and Security Settings

Ensure QuickBooks is not blocked by the firewall or antivirus.

1. Open Windows Defender Firewall.
2. Select Allow an app or feature through Windows Defender Firewall.
3. Locate and allow QuickBooks and QBW32.exe on both public and private networks.
4. Also, whitelist ports used by QuickBooks:
   • 8019, 56728, 55378–55382

Restart QuickBooks and retry the update.

Solution 3: Use QuickBooks Tool Hub to Repair Network Issues

QuickBooks Tool Hub helps fix common network and file issues.

1. Download the latest version of QuickBooks Tool Hub from Intuit’s official site.
2. Open the Tool Hub and select Network Issues tab.
3. Run QuickBooks File Doctor to diagnose and fix connection problems.
4. Follow the on-screen prompts to complete the repair.

Solution 4: Reset Internet Settings and TLS Preferences

Security settings can interfere with connections. Reset them:

1. Open Internet Options in Control Panel.
2. Under the Advanced tab:
   • Check Use TLS 1.2
   • Uncheck older versions like TLS 1.0 and 1.1
3. Go to Connections > LAN Settings and ensure Automatically detect settings is checked.
4. Click OK and restart your PC.

Solution 5: Create a New Windows Admin User

A damaged Windows user profile may block updates.

1. Open Control Panel > User Accounts > Manage Accounts.
2. Create a new account with Administrator rights.
3. Log in with this account.
4. Reopen QuickBooks and retry the operation.

Is there an automated tool to fix QuickBooks Error “155”?

Yes, QuickBooks Tool Hub includes utilities like File Doctor and Network Diagnostics Tool that automatically detect and fix the causes of Error 155. You can download the latest version from Intuit’s official website and follow simple on-screen steps to run the diagnostic tools.

How can I prevent QuickBooks Error “155” in the future?

Keep QuickBooks updated regularly and perform monthly checks for:

• Valid internet connectivity
• Active firewall exceptions for QuickBooks
• Updated digital certificates
• Correct system date and time settings
• Regular backups to avoid data loss

Avoid abrupt shutdowns while QuickBooks is running to maintain data integrity.

What if QuickBooks Error “155” is not fixed after troubleshooting?

If Error 155 persists even after following all the above solutions, the issue might be system-specific, related to deeper Windows corruption, or a server-side problem from Intuit.

How can our experts assist you in resolving QuickBooks Error “155”?

If manual fixes do not work, our certified QuickBooks professionals can provide secure remote troubleshooting, deep-level diagnostics, and complete resolution support. We also help with data recovery and syncing failures.

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