captcha is not working for the admin right after magento2 scratch install

[APGD]

Hi, folks

I followed the procedure below and tried to enable captcha for admin. But I cannot see Capcha on the login window. if I tried to login with correct username and password, I always got error message "Incorrect Captcha". Did I miss anything? Please help.

Thanks very much and appreciate the help!

Procedure:

1. Finished the Magento 2 installation.

2. After login as admin, select Stores > Configuration 

    Note: Store View= Default Config

3. Under Advanced, select Admin

4. Under Captcha Section, set

set "Enable Captcha in Admin"=Yes

set "Display Mode"=Always

high light both "Admin Login" and "Admin forgot password" in Forms field

the rest options as default.

5. Save config.

6. Flush Magento Cache

7. Sign out

8. Clear Firefox Browser Cache.

9. Try to Login again

The error message shown on the admin log page:

Cannot change permissions for path "/var/www/html/magento2/pub/media/captcha/admin" Warning!chmod(): Operation not permitted
#0 /var/www/html/magento2/lib/internal/Magento/Framework/Filesystem/Directory/Write.php(191): Magento\Framework\Filesystem\Driver\File->changePermissions('/var/www/html/m...', 504)
#1 /var/www/html/magento2/app/code/Magento/Captcha/Helper/Data.php(153): Magento\Framework\Filesystem\Directory\Write->changePermissions('/captcha/admin', 504)
#2 /var/www/html/magento2/app/code/Magento/Captcha/Model/DefaultModel.php(280): Magento\Captcha\Helper\Data->getImgDir()
#3 /var/www/html/magento2/vendor/magento/zendframework1/library/Zend/Captcha/Image.php(441): Magento\Captcha\Model\DefaultModel->getImgDir()
#4 /var/www/html/magento2/app/code/Magento/Captcha/Block/Captcha/DefaultCaptcha.php(73): Zend_Captcha_Image->generate()
#5 /var/www/html/magento2/lib/internal/Magento/Framework/View/Element/AbstractBlock.php(652): Magento\Captcha\Block\Captcha\DefaultCaptcha->_toHtml()
#6 /var/www/html/magento2/app/code/Magento/Captcha/Block/Captcha.php(48): Magento\Framework\View\Element\AbstractBlock->toHtml()
#7 /var/www/html/magento2/lib/internal/Magento/Framework/View/Element/AbstractBlock.php(652): Magento\Captcha\Block\Captcha->_toHtml()
#8 /var/www/html/magento2/lib/internal/Magento/Framework/View/Layout.php(542): Magento\Framework\View\Element\AbstractBlock->toHtml()
#9 /var/www/html/magento2/lib/internal/Magento/Framework/View/Layout.php(518): Magento\Framework\View\Layout->_renderBlock('captcha')
#10 /var/www/html/magento2/var/generation/Magento/Framework/View/Layout/Interceptor.php(206): Magento\Framework\View\Layout->renderNonCachedElement('captcha')
#11 /var/www/html/magento2/lib/internal/Magento/Framework/View/Layout.php(472): Magento\Framework\View\Layout\Interceptor->renderNonCachedElement('captcha')
#12 /var/www/html/magento2/var/generation/Magento/Framework/View/Layout/Interceptor.php(193): Magento\Framework\View\Layout->renderElement('captcha', true)
#13 /var/www/html/magento2/lib/internal/Magento/Framework/View/Layout.php(569): Magento\Framework\View\Layout\Interceptor->renderElement('captcha')
#14 /var/www/html/magento2/lib/internal/Magento/Framework/View/Layout.php(520): Magento\Framework\View\Layout->_renderContainer('form.additional...')
#15 /var/www/html/magento2/var/generation/Magento/Framework/View/Layout/Interceptor.php(206): Magento\Framework\View\Layout->renderNonCachedElement('form.additional...')
#16 /var/www/html/magento2/lib/internal/Magento/Framework/View/Layout.php(472): Magento\Framework\View\Layout\Interceptor->renderNonCachedElement('form.additional...')
#17 /var/www/html/magento2/var/generation/Magento/Framework/View/Layout/Interceptor.php(193): Magento\Framework\View\Layout->renderElement('form.additional...', true)
#18 /var/www/html/magento2/lib/internal/Magento/Framework/View/Element/AbstractBlock.php(492): Magento\Framework\View\Layout\Interceptor->renderElement('form.additional...', true)
#19 /var/www/html/magento2/app/code/Magento/Backend/view/adminhtml/templates/admin/login.phtml(47): Magento\Framework\View\Element\AbstractBlock->getChildHtml('form.additional...')
#20 /var/www/html/magento2/lib/internal/Magento/Framework/View/TemplateEngine/Php.php(59): include('/var/www/html/m...')
#21 /var/www/html/magento2/lib/internal/Magento/Framework/View/Element/Template.php(255): Magento\Framework\View\TemplateEngine\Php->render(Object(Magento\Backend\Block\Template), '/var/www/html/m...', Array)
#22 /var/www/html/magento2/lib/internal/Magento/Framework/View/Element/Template.php(279): Magento\Framework\View\Element\Template->fetchView('/var/www/html/m...')
#23 /var/www/html/magento2/app/code/Magento/Backend/Block/Template.php(104): Magento\Framework\View\Element\Template->_toHtml()
#24 /var/www/html/magento2/lib/internal/Magento/Framework/View/Element/AbstractBlock.php(652): Magento\Backend\Block\Template->_toHtml()
#25 /var/www/html/magento2/lib/internal/Magento/Framework/View/Layout.php(542): Magento\Framework\View\Element\AbstractBlock->toHtml()
#26 /var/www/html/magento2/lib/internal/Magento/Framework/View/Layout.php(518): Magento\Framework\View\Layout->_renderBlock('admin.login')
#27 /var/www/html/magento2/var/generation/Magento/Framework/View/Layout/Interceptor.php(206): Magento\Framework\View\Layout->renderNonCachedElement('admin.login')
#28 /var/www/html/magento2/lib/internal/Magento/Framework/View/Layout.php(472): Magento\Framework\View\Layout\Interceptor->renderNonCachedElement('admin.login')
#29 /var/www/html/magento2/var/generation/Magento/Framework/View/Layout/Interceptor.php(193): Magento\Framework\View\Layout->renderElement('admin.login', true)
#30 /var/www/html/magento2/lib/internal/Magento/Framework/View/Layout.php(569): Magento\Framework\View\Layout\Interceptor->renderElement('admin.login')
#31 /var/www/html/magento2/lib/internal/Magento/Framework/View/Layout.php(520): Magento\Framework\View\Layout->_renderContainer('login.content')
#32 /var/www/html/magento2/var/generation/Magento/Framework/View/Layout/Interceptor.php(206): Magento\Framework\View\Layout->renderNonCachedElement('login.content')
#33 /var/www/html/magento2/lib/internal/Magento/Framework/View/Layout.php(472): Magento\Framework\View\Layout\Interceptor->renderNonCachedElement('login.content')
#34 /var/www/html/magento2/var/generation/Magento/Framework/View/Layout/Interceptor.php(193): Magento\Framework\View\Layout->renderElement('login.content', true)
#35 /var/www/html/magento2/lib/internal/Magento/Framework/View/Layout.php(569): Magento\Framework\View\Layout\Interceptor->renderElement('login.content')
#36 /var/www/html/magento2/lib/internal/Magento/Framework/View/Layout.php(520): Magento\Framework\View\Layout->_renderContainer('root')
#37 /var/www/html/magento2/var/generation/Magento/Framework/View/Layout/Interceptor.php(206): Magento\Framework\View\Layout->renderNonCachedElement('root')
#38 /var/www/html/magento2/lib/internal/Magento/Framework/View/Layout.php(472): Magento\Framework\View\Layout\Interceptor->renderNonCachedElement('root')
#39 /var/www/html/magento2/var/generation/Magento/Framework/View/Layout/Interceptor.php(193): Magento\Framework\View\Layout->renderElement('root', true)
#40 /var/www/html/magento2/lib/internal/Magento/Framework/View/Layout.php(938): Magento\Framework\View\Layout\Interceptor->renderElement('root')
#41 /var/www/html/magento2/var/generation/Magento/Framework/View/Layout/Interceptor.php(492): Magento\Framework\View\Layout->getOutput()
#42 /var/www/html/magento2/lib/internal/Magento/Framework/View/Result/Page.php(241): Magento\Framework\View\Layout\Interceptor->getOutput()
#43 /var/www/html/magento2/lib/internal/Magento/Framework/View/Result/Layout.php(162): Magento\Framework\View\Result\Page->render(Object(Magento\Framework\App\Response\Http\Interceptor))
#44 /var/www/html/magento2/var/generation/Magento/Backend/Model/View/Result/Page/Interceptor.php(193): Magento\Framework\View\Result\Layout->renderResult(Object(Magento\Framework\App\Response\Http\Interceptor))
#45 /var/www/html/magento2/lib/internal/Magento/Framework/App/Http.php(119): Magento\Backend\Model\View\Result\Page\Interceptor->renderResult(Object(Magento\Framework\App\Response\Http\Interceptor))
#46 /var/www/html/magento2/lib/internal/Magento/Framework/App/Bootstrap.php(258): Magento\Framework\App\Http->launch()
#47 /var/www/html/magento2/index.php(39): Magento\Framework\App\Bootstrap->run(Object(Magento\Framework\App\Http))
#48 {main}

[Dmitry_Fedyuk]

You should setup the following filesystem permissions for Magento 2: http://devdocs.magento.com/guides/v2.0/install-gde/prereq/file-system-perms.html

[APGD]

Hi, Dmitry_Fedyuk 

Thanks very much for your help! I appreciate.

I did the steps following your suggestion http://devdocs.magento.com/guides/v2.0/install-gde/prereq/file-system-perms.html, but I still hit same error message in the Firefox browser.

Cannot change permissions for path "/var/www/html/magento2/pub/media/captcha/admin" Warning!chmod(): Operation not permitted
#0 /var/www/html/magento2/lib/internal/Magento/Framework/Filesystem/Directory/Write.php(191): Magento\Framework\Filesystem\Driver\File->changePermissions('/var/www/html/m...', 504)
#1 /var/www/html/magento2/app/code/Magento/Captcha/Helper/Data.php(153): Magento\Framework\Filesystem\Directory\Write->changePermissions('/captcha/admin', 504)
#2 /var/www/html/magento2/app/code/Magento/Captcha/Model/DefaultModel.php(280): Magento\Captcha\Helper\Data->getImgDir()
#3 /var/www/html/magento2/vendor/magento/zendframework1/library/Zend/Captcha/Image.php(441): Magento\Captcha\Model\DefaultModel->getImgDir()
#4 /var/www/html/magento2/app/code/Magento/Captcha/Block/Captcha/DefaultCaptcha.php(73): Zend_Captcha_Image->generate()

As the error is related to the file/directory ownership and permission. So I checked more details.

My machine's hostname is "test". Magento files and directories owner user name is "tester". OS: Red Hat Linux R6.

[root@test magento2]# su - apache
This account is currently not available.
You have mail in /var/spool/mail/root

[root@test magento2]# su - tester
[tester@test ~]$
[tester@test magento2]$ grep apache /etc/passwd
apache:x:48:48:Apache:/var/www:/sbin/nologin
[tester@test magento2]$ groups apache
apache : apache

During the magento2 installation, I exactly followed http://devdocs.magento.com/guides/v2.0/install-gde/prereq/apache-user.html and did:

1. adduser tester

Note: This user "tester" is added to own the Magento files and directories.

2. passwd tester

3.[tester@test ~]$ egrep -i '^user|^group' /etc/httpd/conf/httpd.conf

User apache

Group apache

4. usermod -g apache tester

5. [tester@test magento2]$ groups tester
tester : apache

6. Login as user root, service httpd restart

7. Checked all files and directories under /var/www/html/magento2 are owned by tester:apache.

The interesting thing is why captcha codes want to use chmod command to change the permission of "/var/www/html/magento2/pub/media/captcha/admin" which is owned by (user)tester:   (group)apache then hit Operation not permitted. I guess the code tried to do this as (user)apache:    (group)apache.

[tester@test magento2]$ ll /var/www/html/magento2/
total 732
......
drwxrwx---.  6 tester apache   4096 Dec 18 23:42 pub
.........

[tester@test magento2]$ ll /var/www/html/magento2/pub
total 32
......
drwxrwx---. 10 tester apache 4096 Dec 22 22:51 media
.......

[tester@test magento2]$ ll /var/www/html/magento2/pub/media
total 344
drwxrwx---.  4 tester apache   4096 Dec 20 16:30 captcha
.....

[tester@test magento2]$ ll /var/www/html/magento2/pub/media/captcha
total 8
drwxrwx---. 2 tester apache 4096 Dec 20 16:30 admin
drwxrwx---. 2 tester apache 4096 Dec 20 16:30 base
[tester@test magento2]$ ll /var/www/html/magento2/pub/media/captcha/admin
total 0
[tester@test magento2]$

Did I miss any steps?

Thanks again!