7.5. On the old setup the server was Win2003, and IIS6, and the content was stored locally.  The new setup the content is stored on  fileservers (there's a pair of fileservers setup as a cluster for redundancy) and the web servers (two setup using MS Load Balancing, not using IIS shared config) uses a unc path to connect back to fileservers that holds the content. The firewall and av are disabled.  I'm a bit familiar with process monitor but I'm not sure of how to use it to solve this problem.  I've googled for that and Mark R has an example of how to use it for the "access denied" err but I've not found an example of how to use it to solve the "cannot create file and make sure that the path and filename are correct." err.  If you know of a link that describes how to use process monitor to troubleshoot that err please pass it along. the reason why I asked is the following. you assign a drive letter in your user session. however, the iis site isnt running under your session, but the iis worker process (or a user you defined in the app pool), so that user session doesnt have the drive letter. thats why i asked if it does work with unc path in your page Right click asp.file - Properties - Security - Advanced - click on the user account - Edit - "Permission Entry for control.asp dialog box appears" with the