Thread:Project:Support desk/v1.20.2 installation problem - 404 cannot be more descriptive in title

Installed version 1.20.2 but it gives 404 on the main page. GETting index.php redirects to index.php/Main_Page and that gives 404. On the other hand, index.php?title=Main_Page works. I suspect this must have to do with the web server itself (index.php/foo fails to run   index.php) but unfortunately have no access to apache config or even logs. Any suggestions about what I should try to troubleshoot?

Apache version: Apache/2.2.22 (FreeBSD) mod_ssl/2.2.22 OpenSSL/0.9.8q PHP/5.3.10

Before anyone asked, no, this is not about short URLs. I have not fiddled with those (yet).

[I wanted to have a more descriptive title but your system does not allow index.php/Main_Page in title]