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Check the hts-log.txt and hts-err.txt error log files generated in your project's directory by HTTrack — this may give you important information
Plan ahead of time. If you know you are going to use authentication, create a small HTTrack project just to test that HTTrack is able to successfully login.
There are a couple of ways to easily do that, and basically you want to exclude all the website's pages/files and just allow the "login" page and the "logged in" page.
For example:
Set the start URL: http://example.com/clients/login.php
Filters: -* +*/clients/welcome.php*
Remember to exclude any "logout" pages on the site you are mirroring! It would be no good if you've made HTTrack authenticate but then it finds the log-out page and ruins your project.
See our help page about Filters. You'll probably use a filter like -*/logout.jsp
If you reuse an existing project (e.g. update an existing project, or re-run a project when you are trying to get authentication to work) you may experience problems related to cookies.
If you are having trouble making HTTrack authenticate, check for a cookies.txt file in your project's folder and delete it before running the project again.
The site may have a different authentication scheme. Check through our Help information: