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Why doesn't the web interface of my APC Network Management Card finish loading?


The web UI of my Network Management Card does not load completely. For example, minor image parts may not load, such as corners of the tabs on the top of the interface. 

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 (NMC1) - 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 (NMC2) - AP9630/AP9631CH, AP9631/AP9631CH, AP9635/AP9635CH
Devices with an embedded Network Management Card 2 include (but are not limited to): 2G Metered/Switched Rack PDUs (AP86XX, AP88XX, AP89XX), Certain Audio/Video Network Management Enabled products.

  • All serial numbers
  • All firmware revisions below v6.0.X
  • Using various web browsers such as Internet Explorer, Google Chrome or Firefox


This issue stems from how browsers open concurrent connections to web pages.  This technique is used to decrease the time in which a web page loads by accessing multiple connections with the web server.  The network card can handle (5) concurrent connections at once, however, there may be a restriction on the browser specific to embedded devices that limits these connections.


By default, IE8 and Firefox 3 have the ability to open 6 concurrent connections.  Firefox has the ability to change this setting (about:config, network.http.max-persistent-connections-per-server)*.  IE8 currently doesn't offer an easily accessible interface but the change can be made via the Windows Registry. Please contact Microsoft for instructions on how to make this change.*

APC is not responsible for any unexpected results while accessing the about:config screen or adjusting registry settings.  Please do so at your own risk.


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