I had same issue. I downloaded PuTTY and I got “Fatal error” message. Then I searched how to open certain ports on my router and because I am using WDS system, I had to add port 8442 to both of the devices (router and the bridge). That solved this problem.
Here is how you can add ports with TP-Link routers: http://www.tp-link.com/lk/faq-72.html
To check if your device is even on the device list, go to DHCP, DHCP Client List and search for ESP device.
Hope this would help somebody…