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ActiveSync and 0x80072efd

ActiveSync fails to sync with error Code:80072efd. This happened on my cell phone when using ActiveSync 4.2.

The solution lies within the registry.

ActiveSync version 4.2 made a change to how it interacts with the Windows networking stack to use Layered Service Providers (LSPs) on outgoing Desktop-Pass-Through connections. This allows for improved compatibility & policy compliance in environments where connections to the internet must be passed through these LSPs (ISA Proxy is one such example).

source

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows CE Services]
"AllowLSP"=dword:0