DNS can not resolve the host name. Windows Vista

[mornmist]

I keep getting an error message saying that the DNS can not resolve the host name.  I am using Windows Vista Premium 32.  I appreciate any help you can offer.  

[Rolig Loon]

You'll have to clear your cache manually and let the servers rebuild a new local copy on your hard drive.  With Second Life closed, go to the appropriate pathway and delete all the files inside the "cache" folder. Get more help on where to find these.

• Windows XP - C:\Documents and Settings\<username>\Application Data\SecondLife\cache
  • Alternatively, use environment variable %APPDATA% to shorten this path to: %APPDATA%/SecondLife/cache
• Windows Vista - C:\Users\<username>\AppData\Roaming\SecondLife\cache
• Windows Vista Home Premium - C:\Users\<username>\AppData\Roaming\SecondLife\browser_profile\cache
• Windows 7 - C:\Users\<username>\AppData\Roaming\SecondLife\browser_profile\Cache AND

• Windows 7 - C:\Users\<username>\AppData\Local\SecondLife\ (Viewer version 1.23.5 (136262))
• Mac - /Users/<username>/Library/Caches/SecondLife
• Linux - ~/.secondlife/cache

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

[Peewee Musytari]

If you have tried all the suggestions & nothing worked, DNS issues can also be a connection problem.

Restart your computer & leave your router off for at least 10 seconds, try clearing your DNS cache & finally contact your ISP, because it is possible for them to be having a problem even if your internet appears to be working ok in other respects.

I have had the DNS message for SL when my computer is definately online and messengers etc are working fine & have subsequently found out that my ISP was having problems cause by adverse weather conditions. SL can be more sensitive to slight connection problems than other programs.