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Users cannot launch Network Connect; instead they receive nc.windows.app.23704 or nc.windows.app.23712 errors.

1. Media Sense is disabled
   

   The easiest way to check if Media Sense has been disabled is to open up a command prompt and run "ipconfig /all" when Network Connect is not connected. If you see the Media State parameter then Media Sense should still be enabled.
   
   Ethernet adapter Network Connect Adapter:

Media State . . . . . . . . . . . : Media disconnected
Description . . . . . . . . . . . : Juniper Network Connect Virtual Adapter - Juniper Network Agent Miniport
Physical Address. . . . . . . . . : 00-FF-08-50-06-89

   If Media Sense has been disabled then Network Connect will have an IP address in the 169 range or an IP from your last successful connection.
   
   Ethernet adapter Network Connect Adapter:

Connection-specific DNS Suffix:
Description . . . . . . . . . . . : Juniper Network Connect Virtual Adapter - Juniper Network Agent Miniport
Physical Address. . . . . . . . . : 00-FF-08-50-06-89
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 169.X.X.X.
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : X.X.X.X
DHCP Server . . . . . . . . . . . : 10.200.200.200

   You can re-enable it by going to \HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters and change DisableDHCPMediaSense (dword) key from 1 to 0. By default Media Sense is enabled on all XP machines and so if you do not find DisableDHCPMediaSense, then you can usually assume that Media Sense is turned on.

2. DHCP Client Service is disabled
   

   You can re-enable it by going to Control Panel > Administrative Tools > Services

3. A client firewall/antivirus is blocking Network Connect