When i start Drwebd on my machine, it gives the following error; Loading /var/drweb/bases/drw43204.vdb - Ok, virus records: 607 Loading /var/drweb/bases/drw43203.vdb - Ok, virus records: 409 Loading /var/drweb/bases/drw43202.vdb - Ok, virus records: 543 Total virus records: 45804 Key file not found! Plesk authorization failed: HTTP request error  Error: Plesk Software not running. [FAILED] Now drweb worked fine for the previous half year, but now fails all of a sudden. Anyone got an idea? Server is a CentOS 3.6 machine with Plesk 7.5.2, fully updated. The firewall rules are failrly strikt (almost everything is closed with the firewall module), could that have something to do with it?