[Mediawiki-l] Error: $wgProxyKey and /tmp

[Volker Huppert]

Dear all,

when trying to set up a Wiki with MediaWiki 1.3.10 I get the following 
error message:
 >>

    * Script URI path: /wiki
      Warning: $wgProxyKey is insecure Can't find a writable temp
      directory for the XHTML template. Check that the TMP environment
      variable points to a writable directory, or that the default temp
      dir (/tmp) exists and is writable. 

<<

/tmp IS writeable (I even made it 777).

Any hints?

Thanks a lot in advance!

Volker