My version is up to date. I uninstalled it in safe mode and reinstalled it. It seems it works now.
Anyway I do not really understand why it is not possible to check why a connection is blocked. If you have some rules, it is impossible to find out what is going on. Temporarily enabled/disabled rules cannot be seen.
The log is useless. The log should display the reason why it blocks the connection. This is the goal of a log... This firewall could be a very good one, but the lack of admin tools, logs,... it is a shame...
Anyway, thank you for your answer.