The first time you connect to your NEMS server you will use the nemsadmin account (see below).
After you have successfully initialized NEMS, you will instead use the account you create during that process.
As of NEMS 1.3 the default username for initial setup is nemsadmin. This is used to sign-in to your NEMS server (over SSH or keyboard connected to your NEMS server) only until you run nems-init.
Once your nems-init process is complete, you will need to instead sign-in as your newly created account (which you specify during nems-init).
When you initialize NEMS, you will provide a password for the NEMS web interfaces. This username/password will be what you use to access NEMS features (eg., nCONF, Nagios Core, NagVis, Check_MK, Samba, Webmin, SSH, etc.).
If you are on an old version 1.0-1.2.x of NEMS, you will instead use the following credentials: