A DNS error is a DNS issue. A DNS error will not get solved by turning on/off UPnP, media server, etc. In order to by pass an ISP's failed DNS server, as end-users, all we can do is: change our network's DNS IPs to more reality & secure DNS service OR wait for your ISP to solve their DNS servers issue.
I personally use OpenDNS and I've never experience any DNS downtime.
With that said error 80710102 stands for: Issue connecting online.
If you are doing a manual setup make sure you are entering the right network information.
PS3 Network Setup Wizard