The 500 Internal Server Error is not only limited to users visiting your website from a browser. Web admins accessing from the cPanel, webmail, or Web Host Manager too get this error from time to time. In fact, it’s a relatively common issue encountered in webservers. Since there are so many reasons that can result in this error, fixing it can be intimidating. In this article, we’ll explain how to troubleshoot the 500 internal server error whostmgr.

What is 500 Internal Server Error?

Every time a web server serves a web page to a client, it throws a status code. 200 means it was successful, 404 means the page was not found, and 500 means there was a problem with the HTTP web server. You get the error message displayed on the screen.

The first line reads, “The server encountered an internal error or misconfiguration and was unable to complete your request.” It also says that you can find more information related to this error in the server error log.

There are variety of reasons for this error, but we’ll specifically look for the one with whostmgr.

Internal Server Error Whostmgr

You can confirm that you’re getting the Internal Server Error with Whostmgr attribute if the message reads, “Server 500 // No response from subprocess (whostmgr (whostmgr)): The subprocess died from signal: 1”.

A lot can be derived from the message itself. The first one is there was no response from whostmgr which is a subprocess. This can be because of the following reasons:
  • Out of memory
  • Issues with memory allocation
  • the my.cnf file was not configured properly
  • Too many SQL over head
Fixing the Whostmgr 500 Internal Server Error

You can restart your cPanel for using SSH. This is a quick fix to the solution and will resolve the issues temporarily. Use the following command:

Code:
#service cpanel restart
Or you can also update the cPanel. Before that, you need to stop the cPanel services by using the command:

Code:
#service cpanel stop
Now you can update the cPanel using the following command:

Code:
/scripts/upcp -force
Another reason for the Whostmgr error might be issues with RPM database. This in turn can affect other files like the my.conf file. If that’s the case, then there might be duplicate or corrupt entries. To fix this issue, you need to rebuild the RPM database. Use the following command in SSH for this:

Code:
# /scripts/autorepair fix_duplicate_cpanel_rpms
Finally, to complete the fixing process, you need to repair and optimize all databases. At times, large set of tables can crash at once which can cause problem with memory allocation or load balancing. The browser phpMyadmin or host manager cannot recover these crashed tables directly. To verify if this is the case, use the following commands:

Code:
mysqlcheck --all-databases -r #repair mysqlcheck --all-databases -a #analyze mysqlcheck --all-databases -o #optimize
Since this will be going through a lot of database tables, the complete process can take somewhere between 10 minutes to over 30 minutes.

If problem persists, it’s better to get in touch with your hosting provider and convey the error message for them to assist you.
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