One subsite in a multisite stopped working after server migration

Deactivate all caching on the whole network, and make sure you check the wp-config.php and .htaccess that they’re not referencing OLD paths.

After that, you’ll want to try disabling plugins via SQL, and verifying the theme exists.

BTW, https://articles.architectjaved.com/wp-admin doesn’t work either. If you have a plugin that moved that, turn it off.

I changed login url slug to admin using better security plugin.

Also, all my plugins have disappeared…

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Check that the plugins folder is still there.

Moving/renaming that folder is one way to disable plugins, but I didn’t recommend it on Multisite since it turns off plugins for all sites.

If I completely disable all plugins, the subsite works. But if I enable any plugin, even Jetpack or Akismet, then the site and dashboard stops loading. Its all blank. The only way to recover is to FTP to the blog and delete the enabled plugin.

Other subsites in that multisite are not affected with this problem. Only one subsite has this problem.

Is there any solution to this problem?

But if I enable any plugin, even Jetpack or Akismet, then the site and dashboard stops loading.

Oooooh. This is good.

What theme is that subsite using?

Also have you tried turning on WP_DEBUG or checking the PHP error logs?

I had to give up on repairing the site…

So, I exported all posts to xml, copied the images folder, then created a new subsite, then imported the old site into it. Pasted all images into place via FTP. From Network admin dashboard, deleted old site and renamed new site url slug to match the old one…

The problem is now solved. I have a brand new site now… with all my old content.