Comcast interferes with Net traffic
...The Associated Press confirmed through nationwide tests...
...uploads of complete files are blocked or delayed by the company, as indicated by AP tests.
Each PC gets a message invisible to the user that looks like it comes from the other computer, telling it to stop communicating. But neither message originated from the other computer — it comes from Comcast. If it were a telephone conversation, it would be like the operator breaking into the conversation, telling each talker in the voice of the other: "Sorry, I have to hang up. Good bye."