You said that you did disable the windows firewall in your first post.
Just for experimenting. Not as a solution...
You could try to disable your rooter firewall and whatever software firewall you have. And keep it in that way till you figure out what is happening.
Also try to calm down… this doesn’t help you or anyone who want to help.
You have enough theoretical knowledge and you will find the solution just stay focused that this is your operating system settings – rooter NAT – firewall – ISP problem.
There is nothing wrong with the LFS’s master server.
Just for experimenting. Not as a solution...
You could try to disable your rooter firewall and whatever software firewall you have. And keep it in that way till you figure out what is happening.
Also try to calm down… this doesn’t help you or anyone who want to help.
You have enough theoretical knowledge and you will find the solution just stay focused that this is your operating system settings – rooter NAT – firewall – ISP problem.
There is nothing wrong with the LFS’s master server.