A 403 Forbidden error on the WordPress login page usually means that the server understands your request, but refuses to authorize it. This can happen for various reasons. Here are steps to troubleshoot and resolve the issue:

1. Check File and Folder Permissions:

   • Ensure that the permissions for the files and folders in your WordPress installation are set correctly. Directories should be set to 755, and files should be set to 644. Incorrect permissions can lead to a 403 error.

2. Check .htaccess File:

   • If you have an .htaccess file in your WordPress directory, make sure it doesn't contain any rules that might be blocking access to the login page. You might want to temporarily rename it (e.g., to .htaccess_old) to see if that resolves the issue.

3. Check for Plugin/Theme Conflicts:

   • Deactivate all plugins and switch to a default WordPress theme (like Twenty Twenty-One). If you can now access the login page, reactivate each plugin/theme one by one to identify the one causing the conflict.

4. Check for Plugin/Theme Updates:

   • Ensure that all your plugins and themes are up to date. Outdated software can sometimes lead to compatibility problems.

5. Check Security Plugins:

   • If you have a security plugin installed, it might be blocking access to the login page. Temporarily deactivate it and see if you can access the login page.

6. Check for IP Whitelisting:

   • Some security configurations might have IP whitelisting enabled. Make sure your IP address is included in the whitelist if this feature is in use.

7. Check Server Configuration:

   • Contact your hosting provider and ask if there are any server-level security configurations that could be causing the issue.

8. Review Error Logs:

   • Check your server's error logs for any specific messages related to the 403 error. This can provide insight into the underlying problem.

9. Contact Hosting Provider:

   • If none of the above solutions work, contact your hosting provider for further assistance. They may need to adjust server configurations or investigate server-related issues.

10. Try a Different Browser or Device:

    • Sometimes browser or device-specific issues can cause problems. Try accessing the login page from a different browser or device.

11. Reinstall WordPress Core:

    • If none of the above steps work, consider reinstalling the WordPress core files. Make sure to back up your database and files before doing so.

Remember to always back up your website files and database before making any significant changes. This way, you can easily restore your site if something goes wrong during troubleshooting.