Not working please check log file.
DId work before with same hardware.
ESP8266 + 5 Arduino UNOs and ProMini and Nano V3

*** $$ Censored ***

Duino-CoinAVR I2C Miner v2.5.2
Address: 1
Address: 2
Address: 3
Address: 4
Address: 5
Connecting to: $$
.......
Connected to WiFi!
Local IP address: 192.$$$.$$$.$$
[AVR 0] Connecting to Duino-Coin server with port 2813...
[AVR 1] Connecting to Duino-Coin server with port 2813...
[AVR 2] Connecting to Duino-Coin server with port 2813...
[AVR 3] Connecting to Duino-Coin server with port 2813...
[AVR 4] Connecting to Duino-Coin server with port 2813...
FreeRam: 47344 Connected AVR [ 0 1 2 3 4 ]
FreeRam: 47344 Connected AVR [ 0 1 2 3 4 ]
FreeRam: 46840 Connected AVR [ 0 1 2 3 4 ]
FreeRam: 46840 Connected AVR [ 0 1 2 3 4 ]
FreeRam: 46840 Connected AVR [ 0 1 2 3 4 ]
[AVR 0] Server version 2.6
[AVR 0] Requesting job for: $$$$$
[AVR 1] Server version 2.6
[AVR 1] Requesting job for: $$$$$
[AVR 2] Server version 2.6
[AVR 2] Requesting job for: $$$$$
[AVR 3] Server version 2.6
[AVR 3] Requesting job for: $$$$$
[AVR 4] Server version 2.6
[AVR 4] Requesting job for: $$$$$
FreeRam: 45928 Connected AVR [ 0 1 2 3 4 ]
FreeRam: 46360 Connected AVR [ 0 1 2 3 4 ]
[AVR 0] Connecting to Duino-Coin server with port 2813...
[AVR 1] Connecting to Duino-Coin server with port 2813...
[AVR 2] Connecting to Duino-Coin server with port 2813...
[AVR 3] Connecting to Duino-Coin server with port 2813...
[AVR 4] Connecting to Duino-Coin server with port 2813...
FreeRam: 46840 Connected AVR [ 0 1 2 3 4 ]
FreeRam: 46840 Connected AVR [ 0 1 2 3 4 ]
FreeRam: 46840 Connected AVR [ 0 1 2 3 4 ]
FreeRam: 46840 Connected AVR [ 0 1 2 3 4 ]
[AVR 0] Server version 2.6
[AVR 0] Requesting job for: $$$$$
FreeRam: 46168 Connected AVR [ 0 1 2 3 4 ]
.....
And so on. nothing else happen.

17:49:25.780 -> [∙∙∙∙∙] FreeRam: 46144 Connected AVR [ 0 1 2 3 4 ]
17:49:30.766 -> [∙∙∙∙∙] FreeRam: 46144 Connected AVR [ 0 1 2 3 4 ]
17:49:35.793 -> [∙∙∙∙∙] FreeRam: 46144 Connected AVR [ 0 1 2 3 4 ]
17:49:40.775 -> [∙∙∙∙∙] FreeRam: 45880 Connected AVR [ 0 1 2 3 4 ]
17:49:45.793 -> [AVR 0] --------------- TIMEOUT -------------
17:49:45.793 -> [∙∙∙∙∙] FreeRam: 46008 Connected AVR [ 0 1 2 3 4 ]
17:49:50.776 -> [AVR 1] --------------- TIMEOUT -------------
17:49:50.776 -> [∙∙∙∙∙] FreeRam: 46200 Connected AVR [ 0 1 2 3 4 ]
17:49:55.789 -> [AVR 2] --------------- TIMEOUT -------------
17:49:55.789 -> [∙∙∙∙∙] FreeRam: 46392 Connected AVR [ 0 1 2 3 4 ]
17:50:00.767 -> [AVR 3] --------------- TIMEOUT -------------
17:50:00.767 -> [∙∙∙∙∙] FreeRam: 46392 Connected AVR [ 0 1 2 3 4 ]
17:50:05.794 -> [AVR 4] --------------- TIMEOUT -------------
17:50:05.794 -> [∙∙∙∙∙] FreeRam: 46584 Connected AVR [ 0 1 2 3 4 ]
17:50:10.765 -> [∙∙∙∙∙] FreeRam: 46912 Connected AVR [ 0 1 2 3 4 ]