When my Antminer X3 first arrived, I was experiencing connection issues for any pool I directed my X3 to. Since then, I have successfully connected to both a Bytecoin and ETN pool.  My problem was caused from me not including a specific difficulty in the worker input section. Including a difficulty level is something I never had to do in the past for any of my previous  Antminers. If you plan on using the same pools that I used, then change the wallet address to your own.  I also increased the frequency of the X3 to 475M which lead to an increase in my overall hashrate from 220 KH/s to 270 KH/s. If you plan on overclocking your X3 always provide  adequate airflow and routinely verify the asic chip temperatures.

ETN Mining 
URL:stratum+tcp://etn.fairhash.org:8888	
WORKER: ETN Wallet Address.3000000
PASSWORD:x

Bytecoin
URL:stratum+tcp://us.bytecoin-pool.org:8888	
WORKER:Bytecoin wallet address.3000000
PASSWORD:x

 ![Screen Shot 2018-05-03 at 12.47.34 PM.png](https://steemitimages.com/DQmc5fjas4hwBHYzd2ZM12jA47pWXbVp81fWnvBHAaDeY28/Screen%20Shot%202018-05-03%20at%2012.47.34%20PM.png)
![Screen Shot 2018-05-03 at 12.53.38 PM.png](https://steemitimages.com/DQmRd3J7ECW4wfJnjbJ5pUWkwiVKYpa5WCRbucdYaghCNf6/Screen%20Shot%202018-05-03%20at%2012.53.38%20PM.png)

Antminer X3 Electroneum Pool Configuration with Profits
https://youtu.be/dgM_6AUbOuE
How to Configure Antminer X3 Cryptonite Bytecoin
https://youtu.be/MzLqsDH8a_4