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Explanation of 500 Errors

500 Errors are commonly produced when there are errors in the .htaccess file or one of the package limitations has been exceeded.

Use the steps below to find the limitations of your package.

Step 1
Log in to your 1&1 Control Panel and select the relevant package.
Step 2
Click PHP Settings from the Hosting panel.
Step 3
Scroll down and click PHP.INI Settings below the table of your domains.
Step 4
Here you can find the max execution time and memory limit for the version of PHP you are using.

It is common to experience 500 errors intermittently when the package limitations have been exceeded. This may correspond to swells in traffic during different times of the day.

.htaccess Errors

When there is an error with a .htaccess file, all pages of the website will display a 500 error indefinitely until the .htaccess file is corrected or removed. Something as minor as a simple spelling mistake or syntax error will cause a 500 error.

If the .htaccess file has been edited recently, try replacing the file with a backup. If no backup is available, try to undo the changes to the file if you can remember what has been altered.

If these options are not feasible, you can try commenting lines one by one by placing a pound sign(#) at the beginning of the line to "comment it out". Next, try to access a page of the site. Continue this process of adding more pound signs to more lines until the 500 error stops, allowing you to determine which line needs to be corrected.

For additional information, you may want to reference: