ESP8266 Community Forum

Well yes, but this means I should go to the client with my laptop.
And program the ESP right there.
I would like to avoid this.
(of course I 'll do it if I end up with no alternative)

Is there something else I could do? For example to tell him (my client) 'do this to test your router'.
Or 'check this setting in your router'.

Let me tell you what my client told me:
-his router accepts IPs from 192.168.1.2 up to 192.168.1.253 (254 is the default which is used to enter in the web interface)
-the ESP tries to connect with IP 192.168.4.1, which is out of the router 's range, so it rejects it.

Does this make any sense?

In case it helps somebody with a similar problem:
After reading this thread I told my client to

change:
1. Authentication method to WPA2-Auto
2. WPA encryption to: (AES+TKIP)
3. SSID in something that has 6 characters at least.(his SSID had only 4)

He did all these 3 changes and now it works!
I don't know which one was the problem.

Thanks for reporting back and I would never have thought any of those could be the problem.