Unavailable Domains?

[Bruno Lebayle]

Well, we have exactly the same behaviour since our upgrade to BIND 
9.5.0-P2. The problem disappears when restarting the daemon.
Our first problem was with ubs.com, also working fine from a Broadband 
connection, and OK again after bind restart. Then we have had the same 
problem with 3 different italian sites working the day before, and OK 
after bind restart.

I subscribed to this mailing list yesterday because I felt uninspired, 
so I can see that I'm not alone! And eager to get a clue ...

Dean, Barry wrote:
> I have 3 domain names that I cannot resolve recursively from my DNS
> servers. The problem exists inside my institution and not from outside.
> I can resolve what I need just fine from a Broadband connection.
> One domain is bjmu.edu.cn, I cannot resolve the MX records (or any
> others for that matter). If I use "dig +norecurse ... ns" and start by
> looking up ".", then "cn.", then "edu.cn." etc using "@server" and
> trying each and every server at each level, it works.
> 
> I also have a problem with iop.kcl.ac.uk, again non-recursive queries
> all along the chain work a treat, but as soon as you do "dig
> iop.kcl.ac.uk" you get ";; connection timed out; no servers could be
> reached" like the one above.
> 
> Finally I have an issue with ads.ahds.ac.uk, same error ";; connection
> timed out; no servers could be reached".
> 
> This last one is complicated by the fact that just one of my DNS
> servers, the outward facing dns0.liv.ac.uk is a slave for this one, so
> it *can* resolve names in that domain.
> 
> I have contacted the hostmasters at the various places that master these
> domains and they all confirm that they are working fine.
> 
> I have tried debug mode and query logging on a recursive name server and
> get no useful clues, I just see the query and the fact that it times
> out.
> 
> I have tried "+trace" on dig and that causes the queries to work!
> 
> I am completely stumped...
> 
> Is it my servers? If so what do I have to do to them?
> 
> Any clues would be welcomed as I am going out of my tree with this!
> 


-- 
Bruno LEBAYLE.
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