Hello and welcome to the forums.
If you are certain about the issue being a Kernel issue, you could probably just reinstall it, using apt-get. It should be in the packages. This should most likely fix you issue. However, if you are unsure about if it is the Kernel or if the reinstall does not fix it, and you have a backup or a separate /home partition, you could probably also reinstall the OS, while keeping your data.
Also, what do you mean by every port is blocked? Are you referring to this as the Kernel issue you face? Have you tried to unblock the ports using the Command Line or a configuration tool?
I hope this helps...
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