MariaDB upgrade via Plesk interface fails: curl: (28) Operation timed out after 15000 milliseconds with 0 bytes received

Symptoms

• A MariaDB upgrade that was done via Plesk > Tools & Settings > Database Servers > UPGRADE NOW fails with an error that is similar to the following:

  PLESK_ERROR: Analyzing the package manager configuration
  MariaDB download URL 'https://downloads.mariadb.com/MariaDB/' cannot be accessed:
  curl: (28) Operation timed out after 15000 milliseconds with 0 bytes received
  curl: (28) Operation timed out after 15001 milliseconds with 0 bytes received
  If you believe this is a temporary error, please try again later. Otherwise ensure that the URL is accessible from the server. For example, check your DNS, firewall, and /etc/hosts configuration.

Cause

The Plesk server cannot establish a connection to the MariaDB repository at https://legacy-downloads.mariadb.com within the allotted time, because the connection attempt takes more than 15 seconds  and reaches the default timeout:

# time curl -I https://legacy-downloads.mariadb.com/MariaDB/

HTTP/2 200 
date: Tue, 10 Mar 2026 05:57:43 GMT
...
real 0m32.961s
user 0m0.017s
sys 0m0.003s

This might be a temporary issue on MariaDB side or a temporary issue related to the network route that your specific connection attempt uses when it is made.

Resolution

You may try again tomorrow, since it is likely that temporary connectivity issues are encountered.

Alternatively, you may attempt to upgrade MariaDB manually via commands by using the steps in this article:

How to upgrade MariaDB on Plesk for Linux? - section Manual procedure