My listen port is yellow instead of green :(

Hi everybody,
My problem is worldwide problem with the listen port.It is yellow,instead of green.And the worst thing is that it was green last month!
I don`t have any modem or router,my internet is optical.So,I have just one cable into my desktop computer and it is all.
I do NOT have any anti-virus program,even my windows firewall is off!
I have read a lot about the problem,about static IP,about forwarding,about port mapping...and nothing helps
The version of BitComet I am using is 1.34
The version of Windows is XP 32 bit
My type of broadband connection is point-to-point protocol over ethernet (PPPoE)
Device name: WAN Miniport(PPPoE)
Server type: PPP
Server IP: 78.90.248.7
My(client)IP: 78.90.250.*
My IP is the same with def.geatway

Listen Port of TCP:(Blocked by Firewall/Router)
Listen Port of UDP: (Opened in Firewall/Router)
UPnP NAT port mapping: Failed [UPNP device not found!]

Thanks in advance!