Disable max session size in admin - Unable to login to admin anymore

[engcom-November]

Preconditions (*)

2. Magento 2.4-develop, 2,4,4

Steps to reproduce (*)

1. Store > Settings > Configuration. - Advanced and choose System - Security - set Max Session Size in Admin to 0 and save
2. Login to admin

Expected result (*)

1. [Screenshots, logs or description]
2. Login works

Actual result (*)

1. [Screenshots, logs or description]
2. Unable to login

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Please provide Severity assessment for the Issue as Reporter. This information will help during Confirmation and Issue triage processes.

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

Hi @engcom-November. Thank you for your report.
To speed up processing of this issue, make sure that you provided the following information:

• Summary of the issue
• Information on your environment
• Steps to reproduce
• Expected and actual results

Make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, Add a comment to the issue:

@magento give me 2.4-develop instance - upcoming 2.4.x release

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[mgwalk]

I am getting the same issue.
I see admin login
Enter user and pass.
Page looks like it just refreshes

[engcom-Delta]

Hi @engcom-November ,
We have verified this issue on Magento 2.4 develop and 2.4.4 instances. Found that issue is reproducible on both instances.
Hence issue is confirmed.
Please find the attaches screenshots for reference.

1. Login to admin
2. Store > Settings > Configuration. - Advanced and choose System - Security - set Max Session Size in Admin to 0 and save

3. observe that user logged out 4. Login to admin again

[github-jira-sync-bot]

✅ Jira issue https://jira.corp.magento.com/browse/AC-2883 is successfully created for this GitHub issue.

[m2-assistant]

✅ Confirmed by @engcom-Delta. Thank you for verifying the issue.
Issue Available: @engcom-Delta, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

[mgwalk]

I was able to fix by updating frontend and admin before upgrading to 2.4.4.
I also had magefan blog which needed updated.