Someone recently gifted me a UniFi USW-Lite-8-PoE. After configuring, I discovered it wasn’t responding to SNMP queries. Through searching online, I found an article reporting that the max length of the SNMP community string was 11 characters for the switch he had.

Determined to use as long of a community string as possible, I tested further, and have discovered that 21 characters is the max for this switch at the 7.2.123 firmware version.

If your switch isn’t responding to SNMP, reduce your community string length.