@DominikHoffmann
Actually, the key is to read config documentation of the NMC. As mentioned above, in your NMC web gui you need to go to Configuration>Shutdown and select which user will be used on pfsense to establish connectivity. Then, you need to setup the passphrase, which is different from the password you set for that particular user in NMC. Make sure the passphrase is at least 15 characters long as mentioned in config doc. Then you go back to APCUPSD in pfsense and select pcnet driver and then under device ipadd:(user selected in above step):(auth passphrase chosen in above step) You don't have to specify default port unless you have changed that.
BTW, this worked on APC NMC2 card with firmware 07.1(ID17). This is the one labeled with SchneiderElectric instead of APC and mine is from 2016/2015.
Good Luck
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