The issue is likely related to how network drive letters are handled by a process running as a Windows Service.
Please refer to the following Microsoft MSDN support forum topic: http://msdn.microsoft.com/en- us/library/windows/desktop/ms685143(v=vs.85).aspx
Services and Redirected Drives:
- A service (or any process running in a different security context) that must access a remote resource should use the Universal Naming Convention (UNC) name to access the resource.
- The service must have appropriate privileges to access the resource. If a server-side service uses an RPC connection, delegation must be enabled on the remote server.
- Drive letters are not global to the system.
- Each logon session receives its own set of drive letters from A to Z. Therefore, redirected drives cannot be shared between processes running under different user accounts.
- Moreover, a service (or any process running within its own logon session) cannot access the drive letters that were established within a different logon session.
- A service should not directly access local or network resources through mapped drive letters, nor should it call the NET USE command to map drive letters at run time.
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