PS3 internet problem solved.
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I to had the same problem with my PS3. I could not access the Internet. I kept getting DSN error messages. Here is how I solved my problem.
1. I upgraded my wireless router ( D-Link 524) version from 3.00 to 3.23.
2. I changed my SSID name from default.
3. I changed my WEP password from the default 9 zeros to my phone number (easy to remember)
4. I went to Network connections on my PS3.
5. Changed my SSID and WEP password and to my suprise, it worked.
Please e-mail me if this solved your problem. I hope this saves someone a little time.