TCP/IP ports 3457, 3460, ... passthru errors?

From Log server 6.0.1CF1 on Win NT4.Local workstation is 6.0.1CF1 on Win XP Pro.

Any idea where these messages come from ?

“Jean-Pierre Bloch/MStore from host [192.168.38.43:3457] failed to authenticate: This server is not permitted to passthru to the specified server”

idem [192.168.38.43:3460] …

idem [192.168.38.43:3463] …

idem [192.168.38.43:3466] …

No doc found on this subject. Thanks for your reply.

Jean-Pierre