ESP8266 Community Forum

I'm using Arduino 1.8.12 with ESP8266 version 2.7.0
I have an ESP8266 HUZZAH board from Adafruit. I can upload code via serial port without issue. I can connect using WIFI port and the upload completes without errors. However, the 8266 fails to boot after reset. I get a steady dim GPIO0 light.
I am using a simple OTA example that just blinks the blue light.
Serial output:
Progress: 0%...
<snip>
Progress: 100%
End

ets Jan 8 2013,rst cause:2, boot mode:(3,7)

load 0x4010f000, len 3656, room 16
tail 8
chksum 0x0c
csum 0x0c
v9c56ed1f
@cp:0
ld
e:
ets Jan 8 2013,rst cause:3, boot mode:(3,7)

After much searching and trial and error, it turns out that the issue was my WIFI access point settings. I am using a Ubiquiti access point and I had created a separate SSID just for home automation stuff and there were several non-standard settings that were created when I set up the SSID in the first place. Not going into the details because I honestly can't remember what all I tweaked.
Bottom line is that it works now.