Okay, thats strange.
I asked the company which sold us LANDesk if it is possible to store the patches on a network share while using the CSA.
They also have at least one very competent technician who assured that it is possible as well.
Apart from "sold us" and "assured it is possible" this guy is very reliable and it seems he knows LANDesk better than his own pocket.
Thats why I am a little confused now...
However, I did only try the FQDN but not the short name, so I'll give it a shot.
Thanks