Joe,

Testing the V4.1 Mac client we came up against a similar problem
the client established then closed the connection. Tivoli logged
this under an already-existant APAR IC27847 which states:

 " Data backed up with the 3.1 client can not be restored with the
   3.7 client.  Client reports 'Error reading data.'  With a
   Return code of 268435556."

But the real problem was that the data channel could not handle a
tcp_ip WAIT signal when the server tried to restore from tape.

Anyway, the problem was corrected in the lates 4.1 Patch for Mac
4.1.2.15 - IP22153_15.hqx. It doesn't look as though this was
corrected at 3.7 though :(.

Regards
Ian Smith
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Ian Smith             - HFS Backup / Archive Services
Ian Smith             - HFS Backup / Archive Services
Oxford University Computing Services