Whether you are running a fresh install or updating a production site, this guide covers the primary causes and verified solutions to fix the issue. 1. Increase the Composer Process Timeout
Security software or corporate firewalls often block the long-running connections required to download large archives from packages.drupal.org or github.com . Why composer install timeouts after 300 seconds? Whether you are running a fresh install or
Increase the timeout globally or for your specific project. Why composer install timeouts after 300 seconds
Run this in your terminal to set the timeout to 2000 seconds (about 33 minutes): composer config --global process-timeout 2000 If your server or ISP has a misconfigured
Many cURL timeout errors are linked to IPv6 configuration problems. If your server or ISP has a misconfigured IPv6 stack, Composer may hang while attempting to connect via IPv6 before falling back to IPv4, causing a timeout.
The most common reason for Error 28 is that your network or the package server is too slow for Composer's default 300-second (5-minute) timeout limit. Large packages like drupal/core can easily exceed this on mediocre connections.