Unable to connect to Second Life.Are you seeing this error? Well, the good news is there's nothing wrong with the viewer you downloaded. The bad news is that the Domain Name Service (DNS) you use can't figure out the internet address of some URL inside the viewer that it's trying to access.
DNS could not resolve the host name.
Please verify that you can connect to www.secondlife.com
web site. If you can, but continue to receive this error,
please go to the support section and and report this problem.
LL has a wiki page on it here that is marginally helpful. http://wiki.secondlife.com/wiki/Troubleshooting_DNS_login_issues
Anubis Vlad Tepas left a comment on my 2.6.1 posting that is very helpful. It's sort of buried now, so I wanted to bring it back up to the forefront.
Anubis Vlad Tepas said...
For those who have DNS errors, there's a solution that worked (for me, at least).
Go the System Preference -> Network -> Airport (if you're using Airport, otherwise I guess it should be the same with Ethernet) -> DNS.
There, add two adresses :
208.67.222.222
208.67.220.220
I have no idea why this new version of SL messes with DNS servers. And I don't like playing with these settings. But oh well, it's likely to be temporary only.
Hope it works for you as well.
On Linux, you'd add these to your /etc/resolv.conf file like this. The part with the # is just a comment, don't include it.
sudo cp /etc/resolv.conf /etc/resolve.conf.pre-kittin # Make sure you back it up first!
sudo echo "nameserver 208.67.222.222" >> /etc/resolv.conf # Add the first DNS
sudo echo "nameserver 208.67.220.220" >> /etc/resolv.conf # Add the second DNS
