Our application needs to open files across a network, using fopen and _lopen calls. Normally this is not a problem, but at our most recent installation site, we are experiencing a 6 second delay when executing an fopen or _lopen call to a network file. Subsequent calls made immediately to fopen and _lopen execute without a delay, however if we wait for 15 minutes, the 6 second delay re-appears.
Other than this issue, normal networking functions at this site are within acceptable limits.
We are using Windows XP on the client workstation, and Windows 2000 on the file server.
An example of our call is: