On 09/19/17 18:15, Mike Andrews wrote:
12:03:37.726830 usbus4.3 SUBM-BULK-EP=00000082,SPD=FULL,NFR=1,SLEN=0,IVAL=0
  frame[0] READ 1024 bytes
  flags 0xa <SHORT_XFER_OK|PIPE_BOF|0>
  status 0xcf023


Look for:


This is the USB read transfer. The other side is not returning any data, so neither is "cu" printing anything. Maybe you can try to get a similar trace from the system where it works?

Looks to me like some kind of protocol error, that the Cisco USB serial console needs some kind of activation.

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