By default, installation process create a user "admin" with "admin" as password.
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By default, installation process create a user "admin" with "admin" as password for SME9 and below, but password is now stronger with SME10, get it from cli :
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config getprop cacti AdminPassword
'''Of course, the first thing you have to do, is to change it'''
'''Of course, the first thing you have to do, is to change it'''