Problem
The error
pfsense /services_snmp.php: XML error: Undeclared entity error at line 166 in /conf/config.xml
Is shown under Status \ system logs after saving the SNMP configuration in PFSense.
Cause
The SNMP xml file doesn’t support UTF8 characters such as á, é,í, ó and ú.
Solution
Use standard alfa-numeric characters.
I hope that helps
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