Web Console Says "Cannot Obtain Hardware Information," but Command Line Works Fine.

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From the command line, success!

[robier@app50a ~]$ sudo zabbix_agentd -f -t system.hw.chassis[full]
system.hw.chassis[full] [s|Dell Inc. PowerEdge R640 1MVC9T2 Rack Mount Chassis]

...however, from the web GUI, "cannot obtain hardware information."

Any ideas?