can not star Apache web server.

[bsdnewbie999]

Finally it works. But I don't know why it doesn't work previously. Thank you all

[OpenBSD] 
    Apache

                                 It Worked!

   If you can see this page, then the people who own this host have just
   activated the Apache Web server software included with their OpenBSD
   System. They now have to add content to this directory and replace
   this placeholder page, or else point the server at their real content.

                               Documentation

   The Apache manual is available with distribution as part of the misc
   file set.
   Especially read the SSL documentation carefully within the manual, in
   addition to the ssl(8) and httpd(8) manual pages.

                                  Graphics

-- press space for next page --
  Arrow keys: Up and Down to move.  Right to follow a link; Left to go back.
 H)elp O)ptions P)rint G)o M)ain screen Q)uit /=search [delete]=history list

[ai-danno]

Originally Posted by bsdnewbie999

But I don't know why it doesn't work previously.

You mean you don't know why it does work now

If things break again, as noted, check /var/www/logs/error_log , as well as /var/log/messages and /var/log/daemon for other possible problems on your system-

tail -20 /var/www/logs/error_log
tail -20 /var/log/messages
tail -20 /var/log/daemon