Why can't I logon to Viewer 1.23?

[EggyBinks]

I was having troubles with Viewer 2 today and decided to install 1.23 again just so I could get in some RP, but I can't logon to it. It gives me a window saying, "Unable to connect to Second Life. DNS could not resolve the host name." Is this viewer not compatible anymore?

[Rolig Loon]

1.23 is still alive and well, but you have a connection issue.

I like the way LL phrases it: "If DNS can't be resolved as described above, it's somewhat like dialing a forwarding phone number that recently existed but the phones were disconnected — perhaps at the other end, or something in between happened. " Basically, it means that your viewer and SL's servers have temporarily lost the ability to talk to each other because there are squirrels on the line. Unless there's a problem with the servers (Always check http://status.secondlifegrid.net/ first), it's probably something on your end. So....

(1) Try shutting off your computer, unplugging the router and modem for a couple of minutes, and then plugging them back in and restarting. That simple step may clear up everything

(2) If not, try clearing your cache manually. With Second Life closed, go to the appropriate pathway and delete all the files inside the "cache" folder.

Windows XP - C:\Documents and Settings\\Application Data\SecondLife\cache
Windows Vista - C:\Users\\AppData\Roaming\SecondLife\cache
Windows Vista Home Premium - C:\Users\\AppData\Roaming\SecondLife\browser_profile\cache
Windows 7 - C:\Users\\AppData\Roaming\SecondLife\browser_profile\Cache AND
Windows 7 - C:\Users\\AppData\Local\SecondLife\ (Viewer version 1.23.5 (136262))
Mac - /Users//Library/Caches/SecondLife
Linux - ~/.secondlife/cache

(3) If things are STILL messed up, contact your ISP. Maybe they are working on their Internet connections. Mine go down for about 20 minutes once a month or so while they are vacuuming dust out of their servers, or whatever they do.

Mac users sometimes have their own special DNS problem, too. See https://jira.secondlife.com/browse/VWR-25627 and consider adding your vote. Meanwhile see the solution here: http://neilrobinson.wordpress.com/2008/05/19/a-fix-for-dns-errors/.

Basically, it amounts to adding the following additional DNS servers to your DNS settings in Network settings under System Preferences:
208.67.222.222
208.67.220.220