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Your PHP Installation Appears to Be Missing the MySQL Extension: What It Means and How to Fix It (2026)
TL;DRThe missing the MySQL extension message means PHP cannot find the function mysqli_connect, so WordPress stopped before it touched your database. Check the PHP version and the extension list for the account, choose one MySQL driver set, and reload. Plugins, themes and wp-config.php are not the cause.
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The REST API Encountered an Error? WordPress Never Reached It
TL;DRThe REST API encountered an error means Site Health’s test request got no answer at all, so the REST API never ran. Permalinks and plugins cannot cause that; DNS, a firewall or a timeout can. The two other labels are different failures: “unexpected result” is a status code, and “did not behave correctly” is a 200 that was not WordPress’s answer. Read the line under the label, then read the code inside the response body, which Site Health never shows you.
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Briefly Unavailable for Scheduled Maintenance? WordPress Gives Up After 10 Minutes
TL;DRBriefly unavailable for scheduled maintenance means a WordPress update was running and did not finish cleanly. WordPress stops honoring the notice by itself ten minutes after the update began, so deleting
.maintenanceonly saves you those ten minutes. The real job is what the interrupted update left behind: a plugin folder moved aside, a half-copied core, or a lock that blocks the next attempt. Fix that, then update in smaller batches. -
WordPress Asking for FTP Credentials? It’s a File-Owner Check, Not a Password Problem
TL;DRWordPress asking for FTP credentials means one of two tests failed: it could not create a test file in the folder it wants to change, or that new file did not belong to the same user as WordPress’s own files. It is an ownership check, not a missing password. The popular
FS_METHODfix only switches the check off. The same failure quietly stops automatic updates, so find which test failed, fix that, and leave ownership to your host. -
Missing a Temporary Folder: Why WP_TEMP_DIR Won’t Fix This WordPress Upload Error
TL;DRMissing a temporary folder is PHP upload error 6, set before WordPress loads, when PHP cannot create the temporary file an upload is written into. WordPress only prints the text. That is why the popular WP_TEMP_DIR fix cannot touch it: that constant governs downloads, not uploads. Check whether the account is out of files or space, then read the PHP error log. PHP lets only the server configuration set the upload directory, so on shared hosting what remains is your host’s to fix.
