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Windows 2003 R2 Enterprise Clustered File Server intermittently fails with "The specified network na

Posted By:      Posted Date: April 14, 2011    Points: 0   Category :WPF
I'm not sure if this is the correct place to post this issue.   I'm hoping someone can help, we have been trying to solve this issue for months.

I am trying to solve a persistent IO problem when checking to see if a directory exists on a Windows 2003 R2 Enterprise Edition Clustered File Server (Active/Passive).  This issue is not limited to .NET code.  We are seeing it when we do a Directory.Exists, we get false, but the directory does exists.  When we go to create the directory, we get an error of "System.IO.IOException: The specified network name is no longer available."  If this failed all of the time, then we would know it was a permissions issue, but it is successful some of the time (even for days at a time, all with the same user trying to make the connection).  

The environment:

File Server  is Windows 2003 R2 Enterprise Edition Clustered (Active/Passive) sitting behind a firewall.

IIS servers 1/2 are Windows 2003 Standard Edition servers using an F5 BIG-IP for load balancing that sits behind the firewall and creates customer directories if they do not already exist (followed by writing data to the existing directory).  These servers also have WebMethods installed that write the data to the File Server.

IIS servers 3/4 are Windows 2003 Standard Edition servers using an F5 BIG-IP for load balancing that sits in the DMZ and a

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