고수님들~ 어흑~ 보안관련 조언좀...

학교에서 서버를 운영하고 있습니다. 학교 내에서는 홈페이지에 좁속해서 자유롭게 서비스를 이용할 수 있는데, 외부에서 접속을 하는 경우 일분 이내에 홈페이지가 닫혀 버립니다. 그리고 아래와 같은 에러메세지가 남는데요... 그 이유를 알 수 있을까요?

당연 APM 을 쓰고, OS는 Fedora core2입니다.

[Mon Mar 21 13:55:52 2005] [notice] caught SIGTERM, shutting down
[Mon Mar 21 13:55:57 2005] [notice] LDAP: Built with OpenLDAP LDAP SDK
[Mon Mar 21 13:55:57 2005] [notice] LDAP: SSL support unavailable
[Mon Mar 21 13:55:57 2005] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Mon Mar 21 13:55:58 2005] [notice] Digest: generating secret for digest authentication ...
[Mon Mar 21 13:55:58 2005] [notice] Digest: done
[Mon Mar 21 13:55:58 2005] [notice] LDAP: Built with OpenLDAP LDAP SDK
[Mon Mar 21 13:55:58 2005] [notice] LDAP: SSL support unavailable
[Mon Mar 21 13:55:58 2005] [notice] mod_python: Creating 32 session mutexes based on 150 max processes and 0 max threads.
[Mon Mar 21 13:55:58 2005] [error] [client 65.54.188.141] File does not exist: /home/geo/public_html/~petrona
[Mon Mar 21 13:55:58 2005] [notice] Apache/2.0.51 (Fedora) configured -- resuming normal operations
[client 147.46.137.36] PHP Notice:  Undefined variable:  _head_php_excuted in /home/geo/public_html/bbs/_head.php on line 5, referer: http://geop.cbnu.ac.kr/qa.html
[client 147.46.137.36] PHP Notice:  Undefined variable:  _zb_path in /home/geo/public_html/bbs/_head.php on line 13, referer: http://geop.cbnu.ac.kr/qa.html
[client 147.46.137.36] PHP Notice:  Undefined variable:  _zb_path in /home/geo/public_html/bbs/_head.php on line 14, referer: http://geop.cbnu.ac.kr/qa.html
[client 147.46.137.36] PHP Notice:  Undefined variable:  _head_php_excuted in /home/geo/public_html/bbs/_head.php on line 5, referer: http://geop.cbnu.ac.kr/dongmun_bbs.html
[client 147.46.137.36] PHP Notice:  Undefined variable:  _zb_path in /home/geo/public_html/bbs/_head.php on line 13, referer: http://geop.cbnu.ac.kr/dongmun_bbs.html
[client 147.46.137.36] PHP Notice:  Undefined variable:  _zb_path in /home/geo/public_html/bbs/_head.php on line 14, referer: http://geop.cbnu.ac.kr/dongmun_bbs.html
[client 147.46.137.36] PHP Notice:  Undefined variable:  _head_php_excuted in /home/geo/public_html/bbs/_head.php on line 5, referer: http://geop.cbnu.ac.kr/qa.html
[client 147.46.137.36] PHP Notice:  Undefined variable:  _zb_path in /home/geo/public_html/bbs/_head.php on line 13, referer: http://geop.cbnu.ac.kr/qa.html
[client 147.46.137.36] PHP Notice:  Undefined variable:  _zb_path in /home/geo/public_html/bbs/_head.php on line 14, referer: http://geop.cbnu.ac.kr/qa.html
[client 147.46.137.36] PHP Notice:  Undefined variable:  _head_php_excuted in /home/geo/public_html/bbs/_head.php on line 5, referer: http://geop.cbnu.ac.kr/qa.html
[client 147.46.137.36] PHP Notice:  Undefined variable:  _zb_path in /home/geo/public_html/bbs/_head.php on line 13, referer: http://geop.cbnu.ac.kr/qa.html
[client 147.46.137.36] PHP Notice:  Undefined variable:  _zb_path in /home/geo/public_html/bbs/_head.php on line 14, referer: http://geop.cbnu.ac.kr/qa.html
[client 147.46.137.36] PHP Notice:  Undefined variable:  _head_php_excuted in /home/geo/public_html/bbs/_head.php on line 5, referer: http://geop.cbnu.ac.kr/pds.html
[client 147.46.137.36] PHP Notice:  Undefined variable:  _zb_path in /home/geo/public_html/bbs/_head.php on line 13, referer: http://geop.cbnu.ac.kr/pds.html
[client 147.46.137.36] PHP Notice:  Undefined variable:  _zb_path in /home/geo/public_html/bbs/_head.php on line 14, referer: http://geop.cbnu.ac.kr/pds.html
[client 147.46.137.36] PHP Notice:  Undefined variable:  _head_php_excuted in /home/geo/public_html/bbs/_head.php on line 5, referer: http://geop.cbnu.ac.kr/job_bbs.html
[client 147.46.137.36] PHP Notice:  Undefined variable:  _zb_path in /home/geo/public_html/bbs/_head.php on line 13, referer: http://geop.cbnu.ac.kr/job_bbs.html
[client 147.46.137.36] PHP Notice:  Undefined variable:  _zb_path in /home/geo/public_html/bbs/_head.php on line 14, referer: http://geop.cbnu.ac.kr/job_bbs.html
[client 147.46.137.36] PHP Notice:  Undefined variable:  _head_php_excuted in /home/geo/public_html/bbs/_head.php on line