Internal Server Error logging in WordPress admin area

[jominj]

When logging in WordPress admin area getting the following error message.
"Internal Server Error"

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, webmaster@iconinnovations.com.au and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request
Don't get panic, now check the apache error log. You will see the following error message there.
[Wed Sep 14 19:40:20 2011] [error] [client XX.XX.XX.XX] /usr/bin/php: symbol lookup error: /usr/local/lib/php/extensions/no-debug-non-zts-20060613/suhosin.so: undefined symbol: zend_atol, referer: http://www.domain_name/wp-login.php?loggedout=true
[Wed Sep 14 19:40:20 2011] [error] [client XX.XX.XX.XX] Premature end of script headers: index.php, referer: http://www.domain_name/wp-login.php?loggedout=true
If you see this error, then it is an issue with PHP extension "suhosin.so". Please follow the steps given below to fix the issue.

1) Create a custom php.ini file inside "/home//public_html"
2) Disable suhosin by putting a semicolon ';' at the starting of
following line:

extension="suhosin.so"

3) Create a .htaccess file inside "/home//public_html" and put
the following line in it:

suPHP_ConfigPath /home//public_html