Infinite redirects in Magento admin

[Jitheesh]

Preconditions (*)

1. Magento 2.3, 2.3-dev
2. PHP version7.1.3+

Steps to reproduce (*)

1. Navigate to Stores > Configuration > Advanced > Admin > Security. > Add Secret Key to URLs > Yes
2. Login to Magento Admin panel
3. After login admin user will redirected to start-up page. ex: http://shop.dev.magento.com/admin/admin/dashboard/index/key/0edc1d2ff54b4e7e3f7f71e880cee6543870c355f876fddd7b41748355bb7017/
4. Try to access non existing admin path, ex: http://shop.dev.magento.com/admin/xxx

Expected result (*)

1. Redirected to start-up page or redirected to admin 404 page

Actual result (*)

1. Url ends with redirect loop "The page isn’t redirecting properly"
2. Page redirected to http://shop.dev.magento.com/admin/adminhtml/adminhtml/adminhtml/adminhtml/adminhtml/adminhtml/adminhtml/adminhtml/adminhtml/adminhtml/adminhtml/adminhtml/adminhtml/adminhtml/adminhtml/adminhtml/adminhtml/adminhtml/adminhtml/adminhtml/dashboard
3. After this redirect if you try to access valid admin url, page will show "Invalid security or form key. Please refresh the page." errors
   

[magento-engcom-team]

Hi @Jitheesh. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

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• Information on your environment
• Steps to reproduce
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Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento-engcom-team give me 2.3-develop instance - upcoming 2.3.x release

For more details, please, review the Magento Contributor Assistant documentation.

@Jitheesh do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[magento-engcom-team]

Hi @engcom-backlog-nazar. Thank you for working on this issue.
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[magento-engcom-team]

✅ Confirmed by @engcom-backlog-nazar
Thank you for verifying the issue! 👍 Your confirmation will help us to acknowledge and process this report.

[magento-engcom-team]

Hi @shikhamis11. Thank you for working on this issue.
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[magento-engcom-team]

✅ Confirmed by @shikhamis11
Thank you for verifying the issue. Based on the provided information internal tickets MAGETWO-98441 were created

Issue Available: @shikhamis11, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

[magento-engcom-team]

Hi @shikhamis11. Thank you for working on this issue.
Looks like this issue is already verified and confirmed. But if you want to validate it one more time, please, go though the following instruction:

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[magento-engcom-team]

Hi @Jitheesh. Thank you for your report.
The issue has been fixed in #21455 by @Jitheesh in 2.3-develop branch
Related commit(s):

• 11cfe04010a640f52be271cbb7d0ed129a9b900b

The fix will be available with the upcoming 2.3.2 release.