NOD32 / ESET related

How does ESET keep track of who's using the license?

Location of update files on ERA server :
C:\Documents and Settings\All Users\Application Data\ESET\ESET Remote Administrator\Server\mirror

Update Mirror Troubleshooting Checklist
Self experience:
Telnet success but update still fails
UPDATE: do not use dns name, use ip address instead (still don't know why)
UPDATE Feb 27, 2015:
Update via Speedy (ADSL) seems not working because there are two-time port forwarding (one from ADSL modem to mikrotik and one from mikrotik to internal update server)

Error "File not found on server" :
1. ESET Remote Administrator Console \ Server Options \ Updates \ Update Now
2. Try update from client again
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How do I use ESET SysRescue to create a bootable USB flash drive, CD or DVD? (4.x)

Virus Signature isn't updating on Server
it insists that the updates are not necessary and the virus definitions are current [whilst they're not]

ESET SMART SECURITY 5 FREE LICENSE KEY

Trik Mengaktifkan Fitur Server Update ESET Smart Security 5:
Boot to safe mode
Regedit: HKEY_LOCAL_MACHINE\SOFTWARE\ESET\ESET Security\CurrentVersion\Info
Change value to 1

Reserved Update Offline
www.kaskus.us/showthread.php?t=6805432

Related resouces:
ESET NOD32 LiveCD v.7052 [14.04.2012]