As different as night and tyres
Archive - Originally posted on "The Horse's Mouth" - 2008-07-18 13:51:34 - Graham Ellis
I was going to say "as different as night and day" - but they're really too similar! You'll be reading this forum post on our new server, and I'm already seeing a dramatic improvement in performance - partly related to the heavy load on the previous server, partly because the previous server wasn't specifically tuned to our specific requirements, and partly because
it was physically located half a world away from us, which added in a lag time on each access no matter how fast and under loaded the network connection was. Map out the IP address that we're now using for www.wellho.net, and you'll be pointed to London, England!Of course, we have grown to make extensive use of some very specific facilities over the years the site has been hosted in California - some of which were rushed in to short demonstrations which were intended to show a feature or facility rather to to be flexibly hosted, so a number of issued remain to be fixed over coming days, or finally transferred over the coming fortnight.
All sorts of issues with the upgrade (but no major software version issues - after all we do train people to be forward looking!) but I thought you might "enjoy" what is perhaps the most dramatic error message I can ever recall getting out of a Linux system:
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@ WARNING: POSSIBLE DNS SPOOFING DETECTED! @
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The RSA host key for www.wellho.net has changed,
and the key for the according IP address 83.170.95.163
is unchanged. This could either mean that
DNS SPOOFING is happening or the IP address for the host
and its host key have changed at the same time.
Offending key for IP in /Users/grahamellis/.ssh/known_hosts:29
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@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
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IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
9d:8b:2d:0f:b8:17:fd:b3:24:ce:34:ef:de:cb:77:37.
Please contact your system administrator.
Add correct host key in /Users/grahamellis/.ssh/known_hosts to get rid of this message.
Offending key in /Users/grahamellis/.ssh/known_hosts:1
RSA host key for www.wellho.net has changed and you have requested strict checking.
Host key verification failed.
earth-wind-and-fire:~And what caused that? Well - it could have been paraphrased into:
You're in touch with a different machine to the last time you contacted www.wellho.net. Are you sure this is right? and of course, in the circumstances, I am sure ;-)
The solution? Either delete the offending line from the known_hosts file (that :1 in the message means that it's line number 1) or - as I did (but should not admit) just clear down the .ssh directory and reauthenticate all hosts next time you connect to them!