It's because PSN closed their servers. If you want, you can go to the PS Forums and read all the situations there (Not saying you have to, but it gives you a lot of info). I learned that they closed it off and if you try logging into their site, it will say that there's a server maintenance. The error code 80710A06 means that you cannot connect to PSN's main server. Hope that helps : )
If you haven't noticed, Steam and PS are hooking up together because of the game Portal 2. When I went into Steam yesterday, it gave you an option to connect with your PS account and I think that they are fixing that now. Wait patiently and I hope it works tomorrow : )
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Here's a Video about it