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OpenNMS - blank Resource Graphs page - 413 Requested entity too large
5th July 2014

If you have lots of performance graphs for a node in OpenNMS, sometimes you get a blank page showing them.

Especially when choosing a large time period like Last Month or Last Year.

The reason for a blank page is found in the OpenNMS logfiles.

"413 Requested entity too large"

Just increase the requestHeaderSize in /etc/opennms/opennms.properties until the graphs show up.

# This sets the request header size for jetty.
# The default value is 4000 bytes.
Tags: monitoring, opennms.

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