http returns 500 Internal Server Error but not https
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1. The fact that you can't access it by HTTP (port 80) and you can by HTTPS (port 443) might be completely irrelevant.
2. "500: server error" is *extremely* generic - the underlying problem could be just about *anything*.
3. SUGGESTED STEPS:
a) Identify exactly what "application" is on the link you failed to reach.
Simple HTML files? PHP or ASPX scripts? A Tomcat servlet container? A JBoss application server? Something else entirely? A combination of some or all of the above?
b) Try to see if that "application" has any logs.
c) See if the "container" (for example, Tomcat and/or JBoss) has any logs.
d) Look at your web servers logs (e.g. /var/log/apache)
e) Look at your server logs (e.g. /var/log/messages)
[Tue Jun 22 14:37:57 2010] [error] [client xxx.xxx.xxx.xx] Request exceeded the limit of 10 internal redirects due to probable configuration error. Use 'LimitInternalRecursion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace.
and from /var/log/messages
Jun 22 10:45:33 servername ntpd: synchronized to 188.8.131.52, stratum 1
Not sure what this means.
BTW. I am using apache on a redhat linux. No tomcat...
The "app" is drupal, and you haven't configured it correctly, or you have changed something. Check all the config files that deal with standard non-https pages and content. It's not an apache server error, it's an error that apache can do nothing about. You get the same thing with misconfigured perl or php scripts.