On Thu, Aug 18, 2005 at 11:56:43AM -0400, Oscar Castaneda wrote:
> We have some users that access our websites and web applications
> (websites where you can perform database operations and that kind of
> thing) from abroad.
> Today some of them have been complaining because they can not access
> the applications and keep getting a "site not available" kind of message.
> I was wondering if the problem has anything to do with the power
> failures on the recent days. I remember a long time ago when we made
> some changes on domain names and IPs and the changes never propagated to
> some ISPs. I would think that things are better three-four years later,
> when it comes to how routers propagate this kind of changes.
> Did anybody knows how these issues work? or experienced a similar situation?
This could be an issue with the way name servers record a lack of response
from a remote name server. For a period of time, both Tuesday afternoon
and again Wednesday morning, none of the name servers for "msu.edu" were
reachable from the Internet. It's possible that some of the remote name
servers have recorded that fact, in an attempt to reduce Internet traffic
to non-functional name server addresses. If so, I would expect the
problem to have cleared within 24 hours, so by now, I would think the problem
should be gone.
If your users are still having trouble, I can check into it, if you can
tell me the user's IP address and the settings for their name server addresses.
Doug Nelson, Network Manager | [log in to unmask]
Academic Computing and Network Services | Ph: (517) 353-2980
Michigan State University | http://www.msu.edu/~nelson/