After installing Traveler 8.5.3 UP2, I'm unable to see the "Software clients" list in the IBM Traveler administration console. The browser gets a 403 HTTP Error.
This is caused by the absence of a needed option in the web site document. It should have been added by the installation process, but may be you have several Web Site documents in your environment and you're using a different hostname to access your server.
So, to solve the problem, locate the Internet Site Document you are using, add the option "TravelerAdmin" and save the document. Then, at the Domino server console,
>tell http restart
and the problem should be solved.