The requested URL /nagios/ was not found on this server.

[adib@yana]

any one can help me to completed this problem..why my nagios cannot open..please help me

[tmcdonald]

It looks like you didn't complete the install procedure. According to your other thread:

support.nagios.com/forum/viewtopic.php?f=7&t=28817&p=109437

this seems to be the case. If you let us know what guide you followed we can help you better.