does anyone know how to fix NAT TYPE failed for the PS3?

I tried to play modern warfare 3 online for the past few days, and this is the first time that I had this problem when I bought the ps3 I just signed up to the playstation network and put it in my drive of cod mw3, I didn't have to open all ports or whatever it is, I played for about a year and a few days ago I turned on my ps3 and tried to play and nothing happened so I checked my connection and everything was connected, Internet, ip, and sony all have works well but my nat type has been down for about a week now, I reset my modem several times, I have a Siemens Gigaset se567, I tried the connection cable and wireless and Sony, I opened the ports I had and DMZ on always I net type Failed. so if anyone can help me it would be greatly appreciated. Thank you

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