Version: 1.2.9 (using 3.5.9-8.fc9 Fedora, Fedora release 8.93 (Rawhide)) Compiler: Target: i386-redhat-linux OS: Linux (i686) release 2.6.25-8.fc9.i686 If I try to add a feed with an url conformed (no in it's FNL -- the server) by an underscore: example: https://trac.inf.utfsm.cl/proyectos/TCO_MS/feed Akregator reports that it doesn't exist (the feed) In Konqueror (4), you can see the feed. Also, in akregator 3.5.9-2 (in fedora 8, stable), you can add the same url.
I get a 404 error with wget and in konqueror, the page tells me that I can't go further without logging in. maybe a dupe of 110419
That link is indeed a 404 now. I made a little RSS file with an underscore in its name on my localhost, and it works just fine in trunk as of March 15, 2009. It seems this is not a bug.
Closing then. Reopen if it still occurs in KDE4.