Hi Werner,
Maybe it's an alias issue. Can you try to access the wiki with ip address
instead of name? If you can reach the farm this way, check the WikiManager
page and the alias given for Main Wiki ("Domain Name" column). It should be
the same name as the one you were trying to reach.
Regards,
Guillaume Fenollar
2011/7/25 Werner Greßhoff <Werner.Gresshoff(a)uni-muenster.de>
  Hello,
 I've a strange effect with our wiki farm: I can't contact the farm
 administration wiki anymore! All other wikis are available!
 Xwiki seems to think the xwiki wiki is not available and forwards
 me to the error page (this wiki is not available, as configured
 in xwiki.cfg). Is there a way to figure out what's happening here?
 Same system is running on a staging system and the farm admin is
 working well!
 --
 Mit freundlichen Grüßen
 Werner Greßhoff
 Dezernat 2 - Digitale Dienste
 Universitäts- und Landesbibliothek Münster
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--
Guillaume Fenollar
XWiki SysAdmin