With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
agentFTPFileSystemPassword
agent FTP File System Password
1.3.6.1.4.1.171.12.1.2.25.1.10
This object indicates the password to access the FTP server.
Back to AGENT-GENERAL-MIB MIB page.
IPHost Network monitor allows you to monitor agentFTPFileSystemPassword 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 access points right now.