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I had the same error a few minutes ago. These are a few ways that worked for me, and they might work for you.
Method #1 -
1. Reboot PS3
2. Take out plug
3. Take out router plug
Method #2 -
1. Go to your router (Put in your ip, Most defaults are 192.168.1.1)
2. Go to the UPnP Settings, and disable them
3. Save the settings, reboot your PS3, and it should work.
Method #3 -
1. Turn on your PS3
2. Go to Settings>NetworkSettings>MediaNetworkConnection>

isable
3. Restart your Ps3
If you have tried all the following and they don't work, then I'm sorry I couldn't help.
---Sources--
Yahoo! Answers
Playstation Community
Google