My little contribution here..I think i may have found a new failure mode for this socket error..I was getting the same socket connection error on my D3.

Tried everything - flashed firmware, checked router, changed PSU's..then followed the Bitmain's Troubleshooting tree..the recommend to power only the control board and see if you still get this error - if you dont, then its the hash boards (which is worse) ...I was still getting the error after only powering the control board..so was getting ready to change that..my unit is outside warranty, hence was going to order a new control board..slid out the old board, as you know, the board slides smoothly on guide rails inside the metal cover..to install, you got to push it back till the side pins snap back and lock the board..so i slid the board back and noticed that the reset button was not all the way depressed..a slight play in the position was pressing the reset button..i think..after i set it in position, the socket error was gone...not sure if this helps, but whateva..

A lot of smart people have purchased bulk of D3's and re-selling them for 2K more!

https://chicago.craigslist.org/chc/ele/d/antminer-d3-15gh-dash-crypto/6274542259.html

So maybe not all 1800 units start mining for the November batch!..some hope!

Need some opinions - This thread is too big to look for previous comments, appreciate your reply/feedback.

Trying to jump on the Alt coin bandwagon and have 3 days left to pay on Antminer D3 November 16-24 batch - I read about the batch of 1800 from bitmain and the hashrate and network difficulty going up exponentially.

Question does it make sense to spend on the D3 that will come in November ? Assuming Dash does not go over $500, I am not sure if the ROI would be within a year, especially after the network difficulty shoots up like crazy.

any data based profitability analysis would help..i was also thinking would it make more sense just to buy equivalent Dash right now instead of buying the D3..if Dash goes up, i would still make some money

Any thoughts are appreciated.