Blank page or redirect loop error when accessing storefront or Commerce Admin

This article provides a solution for the issue when you access Adobe Commerce storefront or backend and you get a blank page or redirect loop.

Affected products and versions

• Adobe Commerce on cloud infrastructure, all versions
• Adobe Commerce on-premises, all versions
• Magento Open Source, all versions

Issue

Steps to reproduce

Open a storefront or Admin page.

Expected result

The page opens.

Actual result

The page is blank or displays the "This webpage has a redirect loop" error message.

Cause

One of most probable reasons for the issue is that Adobe Commerce is set to redirect from unsecure URL to secure URL, but an unsecure URL is given as the value for the secure URL setting.

To fix the issue, you need to correct the value of the secure link.

Solution

To make sure this is the cause of the problem, take the following steps:

1. Check the web/secure/enable_upgrade_insecure , web/secure/use_in_adminhtml (if you have the blank/loop redirect issue in Admin) or web/secure/use_in_frontend (if you have the blank/loop redirect issue on the store front) value in the 'core_config_data' DB table.
   • If web/secure/enable_upgrade_insecure is set to "1", then Adobe Commerce is set up to add the response header Content-Security-Policy: upgrade-insecure-requests, thus instructing browsers to use HTTPS, redirecting all queries that come over HTTP to HTTPS, for both Admin and storefront.
   • If web/secure/use_in_adminhtml is set to "1", Adobe Commerce returns HTTPS redirects for all HTTP requests for the Admin pages.
   • If web/secure/use_in_frontend is set to "1", Adobe Commerce returns HTTPS redirects for all HTTP requests for the store front pages.
2. Check the web/secure/base_url and web/unsecure/base_url values in the 'core_config_data' table. If they both start with http, then you need to correct the "secure" value.

Fixing the issue:

1. Set the value starting with https for web/secure/base_url.

2. For the changes to be applied, clean the configuration cache by running the following command:

   php <your_magento_install_dir>/bin/magento cache:clean config