I noticed that i receive an activation confirmation mail for every apparently unsuccessful attempt. So i just rebooted and suddently DSS-lite was activated again.
However, i still would like to know what an 'Unknown error 30' means.
This error means that md5 generated some errors from hardware info and md5 that server returns is different, it should not happen and sorry for the inconvenience. Please retry to activate and if this does not work download last version and reinstall DSS LITE again. Let me know if this works.