WinBox V3.18 will not log into new BaseBox 5 V6.18

WinBox V3.18 will not log in to two new BaseBox 5 Intl V6.18.
Login: admin
Password:
WinBox hangs with message
Logging in…

I have reset one of the BaseBox 5 Intl with no results.
I have tried WinBox V3.18, V3.17, V3.16, V3.15, V3.14 and V3.13.
BaseBox 5 is connected to an antenna.

Using Dell Windows 8.1 laptop with CAT 6A cable connected directly to BaseBox 5.
No router or hub is being used.
Using MAC or IP Address 192.168.88.1 has no affect.
Board info form WinBox: RB912UAG-5HPnD

IE will not connect to http://192.168.88.1

Both BaseBox 5 make a short funny sound before making the one beep, long delay, two beeps.
The beeps are similar to the QRT 5 power on.
The QRT 5 does not make the short funny sound.

The Dell works fine with a QRT 5 Intl.
http://www.stargazing.net/david/sdr/HamWAN.html#P2a

What do you recommend to try next to get WinBox to work with the two BaseBox 5.

Best Regards
David Haworth, WA9ONY

Try login in with telnet or ssh or web and first take a look in system resources for high cpu usage. Then upgrade to a newer version of routeros and retry to login with winbox. Sound is not a feature that all routerboards have. Two beeps mean that system has booted. Along with the beeps simultaneously also all lights should blink. So in routerboards without sound all lights blinking twice it means the router has properly booted. After upgrading to the latest version it is recomanded to do a soft reset to get the new default configuration

There is nothing new about this device. You should upgrade it to a version released in the last years. Use Web interface to do that. Open 192.168.88.1 in your browser.