A Quick And Easy Way To Fix QuickBooks Error H303
                     User Actions 
Needed To 
Eradicate 
QuickBooks Error 
H303
QuickBooks is a reliable bookkeeping software that offers the convenience of 
simultaneously sharing company file data among many users. However, this is done through 
a multi-user network which can get affected by internal issues randomly. QuickBooks Error 
H303 emerges while switching to multi-user mode to setting up the network and stops you 
from accessing the data file. If you experience a similar situation in your QuickBooks, give 
this blog a read to acknowledge its reasons and practical ways to get rid of it.
  
A QB-support team of experts is constantly reachable at +1-855-856-0042 for quick 
troubleshooting assistance.

About the issue
You’ll encounter problems setting up a multi-user network after QuickBooks gets struck by this 
error. This error mode mainly indicates that the hosting settings aren’t properly configured, due 
to which the multi-user network cannot be established. Until you remove the error, it’ll be 
impossible to access your company file or share its data with other users in the network. You 
can be stress-free as this error doesn’t affect your financial data, and it is entirely safe. The 
problem occurs due to some incorrect settings and can be easily resolved by configuring them. 
You must make quick troubleshooting decisions, as issues with your company file and 
QuickBooks stuck with this error can severely affect your business performance.
Reasons
Either you’ll come across this error while setting up a multi-user network or working on your 
company file data. The PC conditions which play a significant role in the emergence of this 
error are mentioned below in detail-
• QuickBooks on or more workstations is set to run using the multi-user mode, which isn’t 
allowed.
• Database Server Manager malfunctions in the background when it fails to run the transaction 
log or Network Descriptor file.
• You might have changed the company file location, or it has suffered damage from a virus or 
malware attack on your system.
• Windows Firewall can entirely block you from connecting to another system if its settings 
aren’t configured correctly.
• QuickBooks failing to access its files in your system drives can also prove to be a major 
trigger for this error.
• Technical glitches or bugs generated due to a faulty QBDT installation on your computer can 
also cause the software to behave abnormally.
• DBSM background processes are interrupted by other programs running on your PC.
Solutions
You really need not worry about your business data, as this error does not affect it. You can apply 
the following methods to configure your system settings and eradicate this hosting error from your 
QBDT-
Method 1- Set up the QBDT hosting settings on your PC 
correctly
Incorrect configuration of the hosting settings in QuickBooks is a significant trigger for this error to 
stop you from opening/hosting a company file. The multi-user network only becomes successful if 
a server computer hosts the company file in multi-user mode, and all the remaining systems 
(workstations) should open the file in Single-user mode. You’ll encounter this error code instantly 
while switching to multi-user mode if even a single workstation starts using multi-user mode. The 
QBDT hosting settings can be configured using the steps mentioned below-
• Open QuickBooks on the workstation that initially succumbed to this error and go to 
the File menu.
• Select the Utilities option in the drop-down list and click Stop hosting multi-user 
access.
• Apply these steps on all your workstations to switch them all to single-user mode.
• Now, launch QBDT on the server computer and approach the Utilities option in 
the File menu.
• Click the Host multi-user access option and reboot all the systems concurrently.
• Let them all open and go to the server computer to host the data file in multi-user 
mode
If you come across the issue again while switching to multi-user mode, jump to the next 
solution.
Method 2- Recreate & scan QB program files (.nd & .tlg) in the 
Database Server Manager
Whenever data is shared between systems connected through QuickBooks, Database 
Server Manager runs in the background to monitor the data flow in the network and ensure 
the multi-user network works smoothly. But in case the transaction log (.tlg) or Network 
Descriptor (.nd) files get damaged and fail to run in QuickBooks, the DBSM also 
malfunctions and stops responding to QB requests. You need to recreate the files and 
scan them again in DBSM to prevent them from crashing in the background again. Refer 
to these steps-
• Launch the file explorer and navigate to the QB folder in C:\Program Files\Users\
(User name)\Common data\Intuit\QuickBooksXX (XX is the year).
• Go inside the QBDT folder and search for files with similar name to the data file but 
extensions .tlg & .nd.
• Right-click any one of the files and click the Rename option.
• Edit the file name by adding ‘.old’ as an extension.
• Repeat these steps to rename and save the remaining file.
• Run QuickBooks Database Server Manager on your system and open the Scan 
Folders tab.
• Hit Browse and select the QB folder you recently visited.
• Tap the Start Scan option and wait until the files are registered to be used in the multi-
user network.
• Reopen QuickBooks after the scan is complete.
Check out the next solution if the error stops you from using the network.
Method 3- Make changes in the Windows Firewall settings and 
prevent QB files from getting blocked by an antivirus
QuickBooks failing to perform its functions or connect with other systems also triggers this 
multi-user network issue. It happens when Windows Firewall or any other antivirus on your C 
imposes restrictions on QuickBooks and stops it from integrating with Windows applications or 
running its background processes. You’ll have to let QBDT bypass the Windows Firewall 
restrictions by configuring its settings as shown in the steps underneath-
• Open the control panel on your computer and run a search for ‘Windows Defender.’
• Navigate to the Windows Defender Firewall menu and select the option Allow a program or 
feature through Windows Firewall.
• Choose QBDT in the programs list and make sure to mark 
the Public and Private checkboxes beside it.
• Save the setting using Apply & Ok options at the bottom of the tab.
After the Windows Firewall settings are correctly configured, you must check the quarantine list 
of your antivirus to ensure none of QB files or processes are blocked. If you 
see QBDBMgrN.exe,QBDBMgr.exe, QuickBooksupdate.exe, or any other process related to 
QuickBooks, remove it from the quarantine list. A better option to counter the issue is temporarily 
turning the antivirus off to prevent QB files from getting blocked again.
If the error persists even after configuring Windows Firewall and antivirus settings, move to the 
next solution.
Method 4- Diagnose & fix issues using the QuickBooks Tool hub
It is common for any software to deal with minor issues and glitches randomly while running. 
QuickBooks is no different in this matter and can malfunction due to the. This error can also 
block you while using the multi-user network if the software is infected with bugs or the company 
file is entirely damaged. You just need to download the QB Tool hub from the official website and 
install it on your computer to confront the issues. Here’s how-
• Install the QB tool hub package on your system.
• Double-click the QuickBooksToolhub.exe file to run the tool and go to the Company file 
issues menu.
• Single-click the Run QuickBooks File Doctor Tool option in the list and locate your data file 
using the Browse option.
• Enter your QB Admin password to run the tool and wait until the data file is fixed.
After you repair the company file, you must also fix potential bugs in the software. These bugs 
can stop QuickBooks from executing its function and can also be a reason for background 
processes failing to run. Apply the following steps to repair your QuickBooks Desktop-
• Open the QuickBooks Tool hub menu and click Program Problems at the top.
• Single-click Quick Fix My Program and wait until the tool automatically diagnoses and fixes 
the issue.
• Reopen QuickBooks and try switching to multi-user mode.
• Move to the next solution if you bump into the error again.
Method 5- Provide Administrator access to QuickBooks
QuickBooks instantly casts this error message on your screen when it fails to set up a path to the 
company file. This can happen due to restricted folder permissions or the software’s inability to 
utilize system resources efficiently. You can get rid of all these issues by using the Administrator 
mode to run QuickBooks. It saves the software from security software restrictions and provides 
special access to all the folders in your system drives. Apply the steps given below-
• Go to the QB folder using File Explorer and right-click its launch icon (QuickBooks.exe).
• Click Properties in the options and move to the Compatibility tab.
• Ensure the Run this program as Administrator checkbox is marked and save the settings.
• Try establishing a multi-user network when the software opens.
Wrapping Up!
You read all the necessary details of QuickBooks Error H303 which doesn’t allow you 
to use the multi-user mode or open a company file. You are now well aware of the 
techniques you can use to counter the problem, and we hope you’ll use them to fix this 
QB hosting error on your PC. Consult a QB expert directly by dialing +1-855-856-0042 if 
you face any inconvenience while using the solutions.