out of curiosity, just wanted to know as a user how can I troubleshoot errors shown by apache web server,
let me put 1 scenario...
I am running an Apache web server and server is up from server's browser and few other machines its showing the index page.
but one of the user complains that he is getting some error after pointing his/her browser say 404 or something.

now my question is how the user can troubleshoot what could be the problem as server is up and accessible from other machine.

thanks
Tanweer