The QuickBooks web connector allows the third-party applications to connect and exchange the data to QuickBooks Application very efficiently.

1. QUICKBOOKS
WEB CONNECTOR
QWCLOG.TXT file
QuickBooks Web Connector is a Microsoft Windows
Web-based applications to allows data exchange with
QuickBooks Desktop. QBWC supports passing QBXML and
QBPOSXML between a web-based application. QBWC can
communicate easily for the user as downloading a file.
Once user encounters any Web Connector error,
QuickBooks can't exchange data from third-party web-
based application.
Some QuickBooks Web Connector Error Code
QBWC1005 & QBWC1006: QuickBooks Web Connector failed to
run
QBWC1007, QBWC1008, QBWC1009: Error when connecting to
QuickBooks
QBWC1011: Application named does not exist in registry
QBWC1012: Authentication failed, Server was unable to process
request
QBWC1022, QBWC1023, & QBWC1024: Error when connecting
to QuickBooks
QBWC1033: Web connector failed to initialize QWCLog.txt file
QBWC1040: Web Connector did not provide a valid username
and/or password
QBWC1048: Could not verify the web application server
QBWC1085: QuickBooks was unable to write to the log file
QBWC1016 & QBWC1019: No application was selected and
unselect for update

2. Causes
QWCLOG.TXT gets damaged or corrupt
Damage web connector program
QBWCLOG.TXT file is missing
Steps to Fix QuickBooks Web Connector
Error
Enable QuickBooks Web Connector
Press Windows + R key
Type msconfig in the Run window.msconfig command
Hit OK and click the Startup tab
Find and check mark the QuickBooks Web Connector
Click Apply and OK
Restart Windows
Rename QWCLOG.TXT File
Right-click on QuickBooks Web Connector icon
Select Exit.QuickBooks Web Connector icon
Open Windows File Manager and navigate to
C:ProgramDataIntuitQBWebConnectorlog folder
Right click on QWCLOG.TXT file and select Rename
Enter QWCLOGOLD.TXT and save
Restart the Web Connector
Try using QBWC