Hi,
please first increase two time outs for the AutoConnect service on the "server" machine.
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Please change the following registry entries
HKLM\ Software\ ThinPrint\ TPAutoConnect
-> ListenToWTSTrys - default dec. 10 to 30
-> ListenToWTSTryDelay - default dec 1000 to 3000
and restart the TPAutoConnect service.
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If this doesn't help, please test if turning off "send printer properties" in the
.print Client changes something (2nd configuration tab).