In some specific cases, Windows Mobile device connectivity to a Windows PC running Microsoft ActiveSync 4.0 may experience connection problems.
To isolate what may be causing this, which is generally a firewall or internet connectivity or lan connectivity issue as described in articles below,
1) Please disconnect the PC from any networking or Internet Access,
2) On Active Sync upon connecting, set up a GUEST PARTNERSHIP, by clicking on cancel when the
synchronization screen appears...do not synchronize or engage in a full partnership unless all possible related causes as described
the articles below are identified.
Please refer to the following HP/Microsoft documents which will describe the known issues, and how you can resolve them.