The error message you report does not accurate match my response, but here is something to try.  With some Linux OS, it will not allow scp to overwrite a file without force options.  I usually move the original cgminer first, then the scp works.  For example, first I run this on the miner "mv /usr/bin/cgminer /usr/bin/cgminer.bak".

Also, after you put the new cgminer in place, you may need to add execute permissions.  I typically run this.  "chmod +x /usr/bin/cgminer".

Drop in replacement for /usr/bin/cgminer

How to use:

1. (this step is optional but recommended) update your AntMiner firmware to the latest one: https://bitmaintech.com/support.htm

2. after firmware update is successful, connect via ssh to your miner (use putty under Windows)

3. enter this command to stop cgminer:

/etc/rc.d/S99cgminer stop

4. backup existing cgminer binary

mv /usr/bin/cgminer /usr/bin/cgminer-original

5. upload patched cgminer binary from your computer

scp [path where you download and extracted patched cgminer]/cgminer root@[IP of your miner]:/usr/bin/cgminer

(or use WinSCP under Windows)

6. make the new uploaded cgminer binary executable:

chmod +x /usr/bin/cgminer

7. start cgminer

/etc/rc.d/S99cgminer start

8. go to the AntMiner's web interface and append #xnsub at nicehash or westhash pool URL, press "Save & Apply"

stratum.nicehash.com:3334#xnsub

9. wait a minute and then go to the nicehash or westhash miner's details web page and make sure you have a green checkmark in "Extranonce subscription" column

https://www.nicehash.com/index.jsp?p=miners&a=1&addr=your-Bitcoin-address