Hi, you might want to check out this part nr.lpLocalName = (LPTSTR)((LPCTSTR)locname); based on MSDN: http://msdn.microsoft.com/en-us/library/aa385413(v=vs.85).aspx[^] lpLocalName should be NULL in you case "A pointer to a null-terminated string that specifies the name of a local device to redirect, such as "F:" or "LPT1". The string is treated in a case-insensitive manner." but you use webdav.pspace.co.kr, which may cause the problem I think...