MC40 and MC67 Wifi connectivity issues

I have an MC67 running Android 4.4.4 and an MC40 running 5.1

 

When I configure the networks, I can connect to a remote system for only a short amount of time. Example, turn off wifi, turn it on, and I can go to www.google.com

 

However, after that initial time window, all other connection attempts either give me a "Connection Refused" or a "Connection Timed out" error.

 

I can connect fine with my phone LG running Android 5.1

 

adb shell shows the networks are identical to my phone - same IP range, same DNS, etc.

 

The only difference is that neither scanner has a SIM card in it.

 

Any help will be greatly appreciated.