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NMC Web interface reports "Someone is already logged in"

Issue
When trying to access the web interface, a message is displayed saying "Someone is already logged in"
 
Product Line
  • Web/SNMP Card - AP9606
Devices with an embedded Web/SNMP Card include (but are not limited to): Environmental Monitoring Unit 1 (AP9312TH)
  • Network Management Card 1 - AP9617, AP9618, AP9619
Devices with an embedded Network Management Card 1 include (but are not limited to): Metered/Switched Rack PDUs (AP78XX, AP79XX), Rack Automatic Transfer Switches (AP77XX, Environmental Monitoring Units (AP9320, AP9340, Netbotz 200)
  • Network Management Card 2 - AP9630/AP9630CH, AP9631/AP9631CH, AP9635/35CH
Devices with an embedded Network Management Card 2 include (but are not limited to): 2G Metered/Switched Rack PDUs (AP84XX, AP86XX, AP88XX, AP89XX), Rack Automatic Transfer Switches (AP44XX), Certain Audio/Video Network Management Enabled products, Smart-UPS Online (SRT).
Environment
All serial numbers

Cause
Depending on the model NMC, there is a certain number of maximum sessions allowed.

Resolution
With NMC1 devices, only one active sessions is supported at a time based on a hierarchy of priority (Serial --> Telnet --> Web). If the web interface displays a message stating someone is already "logged in", it can be cleared by either logging into an interface with a higher priority to end any web sessions that may be open, or to reboot the NMC. NMC2 devices support simultaneous sessions, however if the maximum concurrent user limit is met a reboot will also end active sessions.
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