HTTP erro 500

Boa Tarde,

Estou configurando o Nagios mas ao tentar acesso a pagina inicial do site o
mesmo pede o usuário e a senha, autentica, mas apresenta erro http 500
quando acesso http://server/nagios.
Se tento o acesso a http://server/nagios/cgi-bin/tac.cgi funciona sem
problemas

Alguma idéia?

Abraços

Flavio Frigeri Galvão
MSN: [email protected]
http://br.linkedin.com/in/frigerigalvao
http://www.google.com/profiles/frigeri.galvao
http://twitter.com/frigerigalvao
http://pt-br.facebook.com/people/Flavio-Frigeri-Galvao/100000087394984
http://www.myspace.com/489335088
https://sites.google.com/site/sitethisweek/
http://www.thisweek.com.br
------------------------------------------------------------------------------
What Every C/C++ and Fortran developer Should Know!
Read this article and learn how Intel has extended the reach of its 
next-generation tools to help Windows* and Linux* C/C++ and Fortran 
developers boost performance applications - including clusters. 
http://p.sf.net/sfu/intel-dev2devmay
-- 
[email protected] mailing list
https://lists.sourceforge.net/lists/listinfo/nagios-users-br
Wiki: http://nagios-br.sf.net/wiki