Here is an old post from a different issue, but doing all of what is says SHOULD fix the DNS error 80710102. Rule of thumb is, power off modem and router for a minute to two minutes, power modem back on, let it load up, and then power on router. Once they are both power-cycled, try PS3. This method works 50% of the time. See below for the far more annoying other 50% when it doesn't work...
Here is the post topic and my post:http://bit.ly/e8PVBV
And here is an actual copy of my post:
First things first, disable media server unless you absolutely need it, searching for an extra service slows the whole system down. Second of all, if you can narrow it down to a router issue, then your ps3 isn't receiving the download right. I would guess you are in one of two situations. 1. You have an OLD router that does not support UpNp or 2. That you have an older router (3-4 years) and it either doesn't have the latest firmware or has very poor UpNp control. For this reason, I suggest you find the appropriate firmware for you router online and apply it. Directions here. If that doesn't work, disable UpNp through the PS3 network settings and put your PS3 in the DMZ, which is 99.9% safe. Guide for that found here. Before you do that, perhaps configuring your network for speed and statically would work best. Here is a guide. Instead of using the two DNS servers the link I just listed tells you, go to this link, and run GRC's 100% harmless non-install DNS program on your computer. It is confirmed safe hereand you can confirm it here. Use the top two DNS's from the "Response Time" category, and maybe your router/patch issues will get better. I've had to do a lot of research to get my PS3's online working well, so I hope I can help you too!
By the way, just a quick explanation of what UpNp and the DMZ is. UpNp is a protocol found on most routers that opens ports (which are little network tunnels ranging from 1-65535 about) on the fly in your network if an application or programs needs to do so. Think of it like toll booths in a city that lets people in when they need to come in. The only problem with UpNp is that some applications have trouble communicating with it, or sometimes a whole set of applications, like that used by the PS3. For this reason, UpNp can be helpful, but not always. The DMZ, on the other hand, is a protocol for a certain IP address though a router (like your PS3's) that keeps all ports open at all times. If an application needs to use a port, it doesn't need to communicate with UpNp, it just goes right through. DMZ is 99.9% good on PS3s but 100% bad on PCs. Ports open up way for malicious network traffic, which on a PC, will bypass much of the firewall and infiltrate a computer. However, as long as the DMZ assigned IP address is that of the PS3 ONLY, the PS3 is the only device at risk, and the PS3 is not the target of network villains, so it is not much of a concern. With all of this being said, unless your router has the very newest UpNp software and firmware, the DMZ is usually the more preferable choice. Just make sure though, that either UpNp is on OR the DMZ, not both at the same time, they can cause conflicts with each-other.
Good Luck!
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