While Komodo is the best debugger I've ever used for Perl, it has been my experience that it will report "500 read timeout" HTTP responses when running Linux LWP or WWW::Mechanize scripts. If you run the same script from the command line, you will not see these problems (it just sucks to be you if you're trying to debug a problem that occurs somewhere after a few HTTP requests). This has been my experience for Komodo version 3.5 and 4.0. Let's hope the ActiveState team can fix this sometime soon, this is the only fault I can find in their otherwise *excellent* tool.