Unable to activate ModSecurity in Tools & settings > Web Application Firewall:
CONFIG_TEXT: This operation is taking too long. Check the results in a few minutes.
SSL it! is enabled in Extensions > SSLIt!
SSLIt! extension slows down ModSecurity domain reconfiguration.
This has been reported as bug ID EXTSSLIT-606 which will be fixed in future updates.
As a workaround proceed as follows:
Disable the extension SSLIt!:
# plesk bin extension --disable sslit
Enable Tools & settings > Web Application Firewall > ModSecurity.
Re-enable the extension SLIt!:
# plesk bin extension --enable sslit