Files sharing problem between Windows 2003 server host and virtual machine

Regarding VMServer 1.08, when I copy files between a Windows 2003 host and a vm(no matter it is Windows XP or Windows 2003 Server), the following error prompted out arbitrarily, usually for copying large files. First I thought I had solved it by disabling the Jumbo frame and any kind of flow control in network card advance setting. It corrected the problem for most of the cases until I came across a situation to copy a 600MB file, the captioned error "network name is no longer available " prompted out after 10 to 20 seconds.

It was not easy to find the solution as there are many cases, with different reasons, having the same symptom, thus I jot it down for a record.

1. Disable Jumbo frame, or any kind of flow control (try disabling Jumbo frame first)
2. Disable Denial of service attack in Windows 2003. Microsoft had acknowledged it has problem by itself in some cases.

VMWare Server and "...network name is no longer available..."

Did you ever receive following error when you try copy files between guest and host OS?

---------------------------
Error Copying File or Folder
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Cannot copy : The specified network name is no longer available.

And you receive following error on the host OS?

Event Type: Warning
Event Source: Srv
Event Category: None
Event ID: 2025
Date: 26.9.2007
Time: 23:24:11
User: N/A
Computer:
Description:
The server has detected an attempted Denial-Of-Service attack from client \\, and has disconnected the connection.

Here is soluton for this problem:

Disable Denial-Of-Service attack detection

1. Click Start, click Run, type regedit in the Open box, and then click OK.
2. Locate and then click the following registry subkey:
   HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanManServer\Parameters
3. On the Edit menu, point to New, and then click DWORD Value.
4. Type DisableDos for the name of the DWORD value, and then press ENTER.
5. Right-click DisableDos, and then click Modify.
6. In the Value data box, type 1 to disable denial of service attack detection, and then click OK.

Ref: http://blog.mreza.info/archive/2007/09/26/vmware-server-and-quot-network-name-is-no-longer-available-quot.aspx