WebUI ambiguity with empty field.
While the documentation says that 'NULL' or 'any' matches anything, leaving a blank field in the gui does not appear to set that field to NULL in the database, which apparently causes the rule to never match.
While the documentation says that 'NULL' or 'any' matches anything, leaving a blank field in the gui does not appear to set that field to NULL in the database, which apparently causes the rule to never match.