With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swAACServerGroupRowStatus
Switch AAC Server Group Row Status
1.3.6.1.4.1.171.12.5.9.1.18
This object indicates the status of this entry. A set request with RowStatus is 'CreateAndGo' will be fail while the current entry of the table is equal to swAACMaxServerGroup.
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IPHost Network monitor allows you to monitor swAACServerGroupRowStatus on D-Link device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring D-Link VPN routers right now.