Okay, I recently got a Raspberry Pi, and I got it connected to my Wi-Fi - I enabled the SSH and installed Hiawatha, and I could access it just fine from my Desktop, which was running Puppy Linux at that time.
I could also access it just fine when booted into Windows (PuTTY on Win XP Pro,) and the Netbook could access it via PuTTY, as well. (Win 7 Starter)
However, when I booted into Ubuntu, all SSH, HTTP, and HTTPS connections were refused. To confirm that it was Ubuntu, and only Ubuntu, that was having the connection issues, I rebooted into Puppy Linux - connected fine, and into Windows - connected fine. The Netbook could connect to all 3 services without issues either. It was just Ubuntu that said connection refused.
I'd like to know what's wrong - I've already done all the basic troubleshooting: rebooting the RPi, rebooting my computer, rebooting the wireless router, etc. The Raspberry Pi has no Firewall enabled, and my Router offers all devices connected to LAN unrestricted access to each other. I've done extensive testing, and Ubuntu has been proven beyond a shadow of a doubt to be the only one not willing to connect.
UPDATE: Just tested accessing via my external IP, and everything runs smoothly on Ubuntu! However, Ubuntu still can't access the Pi from anything local, and I just re-confirmed that my other OS's can. I think it's weird that Ubuntu has trouble connecting locally (unlike my other OS's,) but is just fine accessing the Pi via my external IP..
UPDATE 2: Disabling my firewall lets me access the device, but the password reports as incorrect every. single. time. I've tried typing it into Gedit, then dragging-and-dropping it into the password prompt during SSH login, and it authorizes when accessing
firstname.lastname@example.org, but NOT when accessing
email@example.com. This is unbelievably frustrating.