"Connect to server manually" will not occur every time. Adobe Drive shows this message to indicate user that it can't detect the server's status now due to network issue. Usually, you can ignore it.
To input 'helloworld://adobe.com' as server URL, you need to select helloworld connector. But as you mentioned that you just can select between Version Cue connector and CMIS connector, it indicates your sample -- helloworld connector doesn't work correctly. I suggest that you check the run configuration in eclipse, make sure that helloworld bundle is checked.
I recently downloaded the Adobe Drive 3 SDK and am having the same problem as the original poster with both sample apps (basicftp and helloworld). I am definitely checking the bundles in the run configuration. In the console, if I type 'ss' I see both of the samples listed as ACTIVE.
I tried typing 'csstat' but that does not seem to be a recognized command.
When I launch Adobe Drive 3.01 I only see the two out-of-the-box connectors (DAM and CMIS).
If I do a proper release build and export to the CS5ServiceManager directory, they do show up in Adobe Drive. However, I really need to be able to run from within Eclipse to properly debug.
I've followed the troubleshooting steps and killed the CS5 and Adobe drive processes using Activity Manager (I'm on a Mac OS 10.7 Lion) and also deleted the 'data' folder, rebooted, no luck.
Please help or suggest something else to try. Thanks!