SFTP specifications

Help, I can't get past internet on the 360. It says it can't acecss the internet. It says there is a problem with my connection. I did everything you said and it didn't work. Plus on the MTU thing on the computer, it doesn't say Ethernet. So then I just reset the faculty settings and it turned to automatic. My xbox has no problems with my IP address or DNS, it just can't get internet. My laptop and phone can still get internet though. Please help?!