CIS firewall and CyberGhost 5

I have installed CIS 8.2 with Windows 7 32bit.
My configuration is “proative security” and firewall “own policy”
When Cyberghost is running in the background it happens today, that the firewall does not open when I
run malwarebytes update for the first time.
After closing cyberghost, the firewall opened correctly after running malwarebytes update.
What has happened??
It would be very nice if anybody could help me.

Thank you very much.

Sounds like an incompatibility with your vpn client cyberghost which is a known issue that comodo firewall doesn’t work with some vpn client software.