WordPress MU

i have a problem of blog upgrade after automatic update :

this pages gives my such a result :

" Warning! Problem upgrading http://subdomain.domain. Your server may not be able to connect to blogs running on it.
Error message: Couldn't resolve host 'subdomain.domain'. "

usually i have no pb with my dns configuration :
i mean i have a wildcard and every subdomain is automatically created and reachable.

but if i do a new installation of wmpu with that type of configuration.
it does not work neither : i mean the instal program gives me a warning that maybe wpmu cannot resolve well subdomains.....

anyone do have an ideao about what to do to solve that.
because one day i will have to uprgade my blogs properly :)

here is my dns config

ServerAdmin webmaster@domain.net
DocumentRoot /home/domain/www
SuexecUserGroup domain users
ServerName http://www.domain.net
ServerAlias *.domain.net domain.net
CustomLog logs/domain-access_log combined
ScriptAlias /cgi-bin/ /home/domain/cgi-bin/
AddHandler x-httpd-php5 .php

if you are on the server can you ping those subdomains? Basically is the server picking up the wildcarded DNS?

yes i can ping
and access to those blogs without pb

sorry i can ping from my own computer

i will test from an ssh instance launched on the server

you are true i can ping and access the wildcard subdomains from external instance, but the server itself cannot .....

this strange to my point of view

Well thats the problem... fix that and it will all start working

yes thank you about pointing the problem

i did not imagine that the situation could be different from my compture and from the hosting serveur.

But could you give me any directions to fix this problem ?

to me this is a weird situation that a remote computer can ping the wilcarded subdomains and not the server itself.
and i do not know where to look to fix that

At a guess the server is not doing DNS resolution using an external DNS source.

If its a *nix box try looking in /etc/resolv.conf and see if there are any nameserver lines.

it is a ovh european RPS.

but i see, the idea. My DNS serveur is effectivelly outside.

i do use everydns.com and i do not use the bind name included in my server

i will check if i can tell my server to look for an external nameserver
if not i will use bind

ok i had opendns server ip addresses to the list at resolve.conf

merci bcp :)