500 Internal Server Error

Could you try to log in to your site via FTP or CPanel, and delete the existing Jetpack plugin folder, and reinstall the plugin manually as explained here:
https://codex.www.ads-software.com/Managing_Plugins#Manual_Plugin_Installation

You’ll find the Jetpack plugin folder here:

wp-content
   plugins
     jetpack - DELETE THIS FOLDER

If you’re not sure how to do this, you can ask your hosting company for help. They should also have documentation explaining how to edit or remove files from your site using FTP or a File Manager in your admin panel.

Once you’ve done so, and if you still run into issues when activating the plugin, could you check your server error logs around the time when you experienced the issue, to find out more about the error?

If you don’t know how to access your server error logs, your hosting provider should be able to help.

Let me know how it goes.

I had the same error and went through all my plugins and found the “Admin Menu Editor” plugin was in conflict with Jetpack. I disabled the plugin and Jetpack worked fine. Are you per chance using the “Admin Menu Editor” too? If so try disabling it.

I’m having the same issue. However, I have no other plugins installed.

When I activate the Jetpack plugin (latest version), I immediately get the Internal Server Error message. The message persists throughout all of WP-Admin, and through all of my site’s pages except for the home page (probably caching).

Deleting the plugin folder (thus deactivating the plugin) resolves the issue immediately.

I have deleted and manually re-added the Jetpack plugin folder multiple times, trying a couple of different scenarios with the PHP alloc numbers. Nothing has worked so far. I’m currently set to 128M alloc, with a max of 256M.

This problem persists after a fresh manual install of WordPress. I’m using GoDaddy (Plesk) for hosting. Their error logs are way over my head, but if you’d like me to post today’s logs, I certainly can.

This problem has persisted over several versions of Jetpack. By the way, I cannot install Jetpack using the auto-install tool. When I click the blue “install” button at the bottom of the page (after entering my site’s URL) it queues up the plugin install. However, when it attempts to communicate with my WP site, it idles out into the same 500 Internal Server Error page. The plugin folder is created and populated successfully (I can see it through FTP) so I’m guessing it errors out when attempting to activate the plugin, just as it would manually.

I’ve been fighting this issue for nearly a year. SOS! Please send help!

@djchupa13 I replied in the other thread you started about this issue here.