I'm having the same issue: "failed saving to db, core: servername as user domain\username method: WebService" while saving a Delivery Method Property.
On remote console and workgroup/Novell environment. Not sure how to fix.
We found out that this problem was related to our proxy. When we disabled the automaticly detect proxy settings from internet explorer it worked. So we adjusted our proxy script for bypassing our proxy for Landesk. This solved the problem for us. I hope this helps for you