The 500 Internal Server Error is a most commonly HTTP status code message, given when no more specific message is suitable. 500 error means something is wrong on the website's server but the server could not be further specific what the exact problem in it.
Every website have permit to customize the message of error 500 so we can see Internal Server Error 500 in many ways.
Here are some common ways in which you might be seen the error 500.
You can see 500 Internal Server Error on your smartphone, in any browser, in any operating system.
Internal Server Error shows something is wrong on the page or site's programming.
A 500 Error is used to indicate a problem with a misconfiguration on a website or server .
It can be appeared due to many different issues so may be difficult to resolve this error. Scripting issues is one of the reason for this error such as a form fails to handle a missing or incorrect value correctly.
Many server faults can also cause this error like nonfunctional software module or failed disk.
Here below we are discussing the reasons of error 500.
CHECK THE ERROR LOGS!
With any error message, especially internal server error 500, you will first to check any Apache and PHP error logs for your server. These logs may provide you the beneficial information related to any code failures or other potential causes of a site failure. For finding where the logs for your server, you must see, where are the access_log and error_log for my server?
ERROR WITH AN .HTACCESS FILE
Another common cause of the 500 Error is a misconfiguration in the .htaccess file.
If the user are using an .htaccess on your site, it may be create issues with the web page when you are trying to load into your browser. Please check the .htaccess configuration. Any syntax error in this file cause a 500 Internal-server-error message, so instead displaying of your website, it shows the error 500.
For confirmation whether 500 error is due to .htaccess file, then temporarily remove or rename the .htaccess file, and then try to reload the page.
If the page not load then see .htaccess rewrite rules and .htaccess files.
PHP CODING TIMING OUT
If your PHP script makes an external network connections, the connections may time out. If attempted are too many connections and time out, this will cause an "Internal Server Error 500." For prevention of these time outs and errors, you will make sure that the PHP scripts must be coded with some timeout command. Normally catching a PHP timeout error are much difficult when connecting to a database or externally to remote resources. They freeze the script from continuing to run.
Decreasing external connections can increase the performance of your website and decrease the chances of you receiving a "500 Internal Server Error."
CODING OR SYNTAX ERRORS IN YOUR PERL SCRIPT
Perl scripts run on the command line, and they do not log errors on the web server logs. Perl scripts caused a “403-forbidden” or “Internal Server Error 500” and this error message are logged on the web server's error log. You can use the cPanel to view the error log for your website.
This log will show a list of error messages from your website. You will find comprehensive information about every error including the time and date of the error, information about folder or file which is generating the error and some information about description of the error. From this log, you will find the solution of 500 Internal Server Error.
You get help from WestHost knowledge base articles on how to resolve the most common of Internal Server Error 500. If you cannot find a solution to your specific problem, or if the log does not display any error information about your particular problem, please submit a ticket to the WestHost support team.
CGI (Common Gateway Interface) SCRIPT ERRORS
When you edit your CGI script, you must use a plain text editor that saves the file as a 'text file' type. DO NOT use IDE (integrated development environment) that comes with Microsoft Windows because it does not save files in pure ASCII text format. Simply use Notepad to edit files.
Your CGI scripts Upload in ASCII mode into the cgi-bin directory.
File permissions Set on the CGI script file and directories to be chmod 755. If you are used an FTP program to transfer files, then right click on the file and select change file attributes.
ISSUES TRIGGERED BY WRONG FILE AND PERMISSIONS ERROR
This is the commonly cause of 500 Internal Server Error. If the permission of one more files or directories is incorrect, it will not be accessible to the server so that the server is returned error. The example of this type issue is the wrong permission of a PHP script. This issue can be fixed by resetting the correct permission with right click on file or directory and set permission with this "0755" code or with the command line using this "rwxr-xr-x".
The Internal Server Error 500 is normally caused by the server, but there are only few actions which can be taken from the client side.
REFRESH THE WEBPAGE AND WAIT A FEW MOMENTS
Click on refresh/reload button, pressing F5 or Ctrl + R, or from the address bar trying the URL again and wait for the page to reload. The server issue might just be temporary issue that may resolve itself.
Simply trying the page again will often be successful.
CHECK YOUR RECENTLY INSTALLED WORDPRESS THEMES AND PLUGINS
Some 500 error are usually caused by incompatibilities with just now installed WordPress themes or plugins. If you have a new installed a plugin or theme, disable any recent plugins or revert to previous themes to resolve the error.
Make sure to that all of your themes and plugins are updated and functioning correctly. For fixing this issue you are disabling all WordPress plugins and activating one at a time while checking for error.
CLEARING THE CACHE AND DELETING BROWSER COOKIES
500 Internal Server Error are not often caused by caching issues, but it is possible sometimes the 500 error issue will be fixed after you delete the cookies and clear the browser cache.
In Google Chrome to clear the cache and cookies by following the below steps.
To clear browsing cache and cookies in Mozilla Firefox, Please following the below steps.
After clearing the cache and deleting the cookies, restart the browser and try again.
504 GATEWAY TIMEOUT
Sometimes servers produce 504 Gateway Timeout when the server did not receive a timely response from another server. This 504 error may occur when the other server is down or not working appropriately. Sometimes the web server may return a 500 Error instead of the 504 Gateway Timeout, but that is not common.