Well they r using injecting a RST packet into your stream (open connection u just made) to both u n the other guy telling that closes the connection. In otherwords, streamiesex is adding the command to ur packets that you closed ur connection to the peer n peer has also closed his connection.

They dont block ports, that's takes too much effect... this way is easier... i guess u have exceeded ur quota for the month n the balance is carried over maybe to the next month....

Who know's what funny crap they r up to...