The following troubleshooting steps can help with many different Activation code issues in ZoneAlarm NextGen products including Invalid OTP error message.

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Do you use a VPN connection? If so, turn off your VPN and do the following. 
Note: that you still need to the steps below even if you don't have a VPN. 

1. In the search box on the taskbar, click Start, type command prompt, right-click the command prompt result and then select Run as administrator and confirm.

2. At the command prompt (decline restarting your machine until you have entered the final command):   

3. Type ipconfig /release and press Enter.

4. Type ipconfig /flushdns and press Enter.

5. Type ipconfig /renew and press Enter. (This will stall for a moment.)

6. Type netsh int ip reset and press Enter. (Don't restart yet.)

7. Type netsh winsock reset and press Enter.

8. Now restart your machine using Start > Power > Restart

After the restart, right-click on the ZoneAlarm icon on your desktop or start menu. (Don't connect to your VPN).
Select Run as administrator.
Retry the activation process.

1. Open ZoneAlarm.
2. Click the ? Icon located at the upper right corner.
3. Click Enter Activation code.
4. Enter your 6 digit activation code on the line.
5. Click Activate.

If you continue to have problem please contact ZoneAlarm support by Live Chat at:

ZoneAlarm Support Live Chat