|I didn't really know, how Trend Micro installs, to use firewall, antivirus a.s.o.|
I would suggest to take a look at the services.
Sometimes, software did not uninstall correctly and e.g. did not uninstall it's service.
So in that case, e.g. a service for the Trend Micro firewall may still run while the software is already uninstalled. There are no firewall filters left and so the service mostly will block all the traffic to the internet.
If there is no Trend Micro service left, there might be an additional protocoll specially installed and used by the Trend Micro firewall.
If there is a special network protocoll from Trend Micro in the settings for your network cards, uninstall it.
Please send a reply, if you solved the problem !!!