Hello,
We apologize for the issue you are facing with the setup wizard in your multisite installation. The "You are probably offline" error typically indicates a problem with the connection or a misconfiguration in the site settings.
Here are a few steps you can take to troubleshoot this issue:
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Check Site URL Settings: Ensure that there is no mismatch in the URLs on your WordPress settings. Go to WordPress Dashboard → Settings → General and verify that the WordPress Address (URL) and Site Address (URL) fields are correctly set and match your domain.

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Check User Permissions: Make sure you are logged in with an admin account, as certain settings require admin capabilities to access.
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Browser Cache: Clear your browser cache or try accessing the setup wizard in an incognito window to rule out any caching issues.
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Plugin Conflicts: Deactivate other plugins temporarily to see if there is a conflict causing this issue.
If these steps do not resolve the problem, please reply to this ticket with your site URL so that a human agent from our support team can assist you further. Thank you for raising this concern!
Hello,
Please make sure you’re using the latest version of the Rank Math plugin on your website: https://rankmath.com/changelog/free/
Also, please note that the correct way to use our plugins in a multisite setup is to install them at the network level but activate them only on the specific subsites where you need them.
If you have activated the free version of the Rank Math plugin at the network level, please deactivate it there and then activate it on the individual subsite. Let us know if that resolves the issue.
Looking forward to helping you.
Thank you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.