I actually know exactly what the problem is. The 1.4.x file servers implement a change to prevent unfriendly clients from repeatedly requesting FetchStatus operations on the same object. The 1.4.x and earlier Windows clients do not implement the InlineBulkStatus operation. This was first implemented in 1.5.3. Without InlineBulkStatus, when Windows attempts to perform a status operation on each of the files and directories within a directory that has 'l' but not 'r', the FetchStatus operation will fail. Therefore there is no data to cache and the client must repeatedly query the server. This triggers a backoff algorithm to slow down the client. In turn the SMB client is breaking off the connection and ....
In other words, it is a change in the 1.4.x servers that is hurting you. The 1.5.8 Windows client will save you. Jeffrey Altman
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