Add support for SNMPv3 authNoPriv mode in PRTG
As a network engineer managing devices from ISPs and vendors with restricted SNMP configurations, I want PRTG to support SNMPv3 authNoPriv mode (authentication without encryption) so that I can monitor critical infrastructure devices that only allow this security level.
Currently, PRTG only supports SNMPv3 with authPriv (authentication + encryption). Many providers, e.g. Telekom, only offer SNMPv3 in authNoPriv mode.
Example configuration (as provided by Telekom, not changeable):
Mode: authNoPriv
Authentication Protocol: MD5
Privacy (Encryption): None
Since PRTG does not support authNoPriv, monitoring such devices is currently impossible.

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