I'm afraid I can't help very much. I can tell you that I am using Ramble on my 8830 with no problems. Ramble does place a settings application under options on my 8830. My network connections is set to device default and TPC Host and Port is set to: toc.osar.aol.com:8080. The default browser on my 8830 is set to internet browswer rather than blackberry browser.
It could be that your settings are sending your connnection through your BES and your company has blocked that port behind your firewall.
Try changing the settings to those above and see if that gets you going.
this was happening to me for a day or so until I accidentally figured out how to fix it on my 8830 - I had auto-connect on, so when I opened Ramble, AIM would automatically attempt to connect. When this happened, I pressed the back key, taking me to the icons. After a few tries of pressing back right as soon as AIM begins to connect, it won't go back to the icons, but instead will allow you to manually select connect within Ramble. Once I did this, it would connect perfectly - but I did have to do this every time to make it log on. I got sick of that and now I have JiveTalk and it's way better. Hope that helps - this seems like a weird fix so I'm not sure if this will help anybody else, but thought I'd post it anyway
I have to chime in with a resounding "me too". I'm trying beejive, but I was perfectly satisfied with RambleIM on my old 7100c and messing with making things work on my new 8830 is starting to bug me. I have issues with BBToday and with some of the google helper apps as well.