but this has been happening for months

Hey all , please help me , the servers on the servers list in LFS dont all show up , they show up but only like 150 of them , and it sais no reply 300 or what ever , i recently opened the ports it needed , that worked on the other pc in the house , then on mine , it said failed to connect to master server , so i closed one of the ports and it connects but still very slowley and not all show up , but the other pc , it works fine on , please help me .

Thanks Alot

Danieel199