What cause 500 Internal Server Error?

Standard

A 500 Internal Server Error can be caused by many things, including but not limited to invalid permissions, invalid ownership, bad lines in your php.ini or .htaccess file, invalid requests in the script, and others not mentioned here. Typically this is not a problem with the server itself, and can be most often resolved by modifying something in your site’s configuration. Please check the Error Logs in cPanel for specific information.


Example of Server 500 Error

A Server 500 error will generally look something like this:

Internal Server Error

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

Please contact the server administrator, [email protected] 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 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

Bad permissions, Writable by group

A bad permissions error may look something like this:

[Sun Jun 05 12:03:22 2012] [error] [client 66.249.72.82] SoftException in Application.cpp:601: Directory "/home/exampleuser/public_html" is writeable by group

In this instance the folder had permissions for a folder set too high. To correct this, the permissions need to be changed from “777” to “755”.

Directories and folders should be 755. Executable scripts within the cgi-bin folder must be 755. Images, media, and text files like HTML should be 644.

  • Files – 644
  • CGI Scripts – 755
  • Directories – 755

You can modify permissions with the File Manager, located in the “Files” category of the cPanel, an FTP client, or using the chmodcommand in SSH/Bash.

Bad .htaccess, Invalid code, command, or syntax

In the .htaccess file (“dot htaccess”), you may have added lines that are either worded badly or conflicting. The best way to troubleshoot this is comment out the lines in the .htaccess.

You can comment out a line in the .htaccess by adding # to the beginning. You are wise to save an original copy of any file before you make changes.

For example, if the .htaccess looks like this:

DirectoryIndex default.html
 AddType application/x-httpd-php5 php

Then try something like this:

DirectoryIndex default.html
 #AddType application/x-httpd-php5 php

Broken lines and lines that start with php_flag are the most common mistakes. If you cannot determine which line is the problem, then comment out every line.

Other common .htaccess errors:

FollowSymlinks:

An error may look like the following:

[Sun Jun 05 12:07:10 2011] [alert] [client 66.249.72.82] /home1/examplec/public_html/.htaccess: Option FollowSymlinks not allowed here

In this example the error is simple to fix; in the file specified, use a permitted directive–in this case use “SymlinksIfOwnerMatches” instead of “FollowSymlinks”, or remove the line entirely.

Syntax Not Closed:

An error may look like the following:

[Sun Jun 05 12:11:38 2011] [alert] [client 66.249.72.82] /home1/examplec/public_html/.htaccess: /home1/examplec/public_html/.htaccess:3: <IfModule>ExampleRule/Module> was not closed.

Again, the solution is to simply fix the syntax, or remove it. In this case, close the ending “</IfModule>”; directive properly and put the rules on their own line to resolve the problem.

These are just a few common examples that can be caused by bad .htaccess parameters. What you encounter will likely vary, however generally the error message is descriptive enough to determine an error from it without further investigation.

Improperly configured php.ini

ForceType:

When you are using files with (or without) an extension different then the normal extension for that filetype you can use ForceType in your .htaccess file to make it clear to the server how to handle that file (or all the files in the folder) (this works on servers without phpsuexec).

An example: When you have a file called “item” (like Nucleus uses for FancyURL’s) and want it to be parsed by the server as php you use the following code in your .htaccess file:

ForceType application/x-httpd-php

However, because our servers use phpsuexec this will result in an internal server error. To solve this you can simply use SetHandler instead of ForceType, so your .htaccess-file becomes:

SetHandler application/x-httpd-php

php_value:

On a server without phpsuexec it is possible to use the php_value statement in a .htaccess file to change the settings of php (actually overwrite the settings from php.ini). On a sever with phpsuexec this will also result in a server error. To solve this you can use a php.ini file which you put in the same folder as where you would have put your .htaccess file. In that php.ini file you can change all the php values. You only have to put the values you want to modify in that file. By example if you want to set the short_open_tag to Off you would have usedshort_open_tag? = off in your .htaccess file. Using a php.ini file this results in:

[PHP]
 short_open_tag = Off

Leave a Reply

Your email address will not be published. Required fields are marked *