Maxthon_Fr

All my apps and plugins were manually tested with IPB 4.7.0 and PHP 8.1 but it appears IPS have required further changes to be made. I'll be going through and updating them all again in the coming weeks but until then, if you are using the latest version, none of these logs appear to be critical and you are able to manually enable the application again until I've updated this.

Portal v1.8.1 is fully compatible with v4.7.2.1 and PHP 8.1.10.😉
I upgraded my site without any problem, after disabling the Back To Top 1.5 plugin which is not compatible.
I had to uninstall Portal which was installed via the Marketplace and reinstall it manually by importing the custom blocks.

That sfs prefix calls to mind Stop Forum Spam. I've seen that column recently on a forum I upgraded from 3.4 to 4.6. Do you have an application like that installed? If you do try contacting its developer.

Sounds like the field above in your database is from a third party application and missing a default value. You can disable strict mode on your MySQL server to disable these checks. Please check with your hosting provider with performing it. 

I have this error :
2016/01/15 10:17:37 [error] 2284#0: *495111 FastCGI sent in stderr: "PHP message: PHP Fatal error: Call to undefined method IPS\portal\extensions\core\FrontNavigation\Portal::activeOrChildActive() in /var/www/forum4/system/Theme/Theme.php(692) : eval()'d code on line 6929" while reading response header from upstream, client: xxx.xxx.xxx.xxx, server: localhost, request: "GET /forum4/index.php?/ HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "www.maxthon-fr.com", referrer: "http://www.maxthon-fr.com/forum4/index.php?/"