permission problem? Im not sure.

Hi. One of my developers has reported that his backup procedure has stopped working. His backup script basically copies files to a network share. I checked the permission on the network share, and everything was okay. From the web server, I was able to open the network share from run or drive mapping without a problem. I don't know what's going on here. The error message is below:

Summary:
Bring client reports/documentation from drop off location on SERVERNAME

(\\SERVERNAME\PATH\WebSiteUpload) to webserver
(/CorporateWEB/Uploads/)

System.IO.IOException: The specified network name is no longer available.

at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.Directory.InternalGetFileDirectoryNames(String path, String userPathOriginal, String searchPattern, Boolean includeFiles, Boolean includeDirs, SearchOption searchOption)
at System.IO.DirectoryInfo.GetFiles(String searchPattern, SearchOption searchOption)
at System.IO.DirectoryInfo.GetFiles()
at ASB.Automation.WebSiteUpload.PerformJob() in C:\ASBDevelopment\ASBAutomation\AsbJobs\Maintenance\WebSiteUpload.cs:line 35
at ASB.Automation.Control.AsbJobRunner.RunJob(String[] args) in C:\ASBDevelopment\ASBAutomation\ASBJobFramework\ASBJobControl\AsbJobRunner.cs:line 94

Have that script display the full path it's trying to reach, then see if you can reach it by logging on the server and putting it in the Start/Run dialog -- if it's reachable it will come up in windows explorer