step 1: open ESET Smart Security
Step 2: goto "Setup"
Step 3: press Toggle Advanced mode
Step 4: press Entire Advanced Setup tree
Step 5: FIND THE Update
Step 6: press EDIT
Step 7: Add http://eset.com.sapo.pt
step 8: Add http://up1.nod123.cn
Steo 9: when added set the Update server: Choose...