confirmed on redis 5.0.7 too

off-topic
are you able to install j4 from github latest staging on docker ?
i'm experiencing npm issues......

Unable to reproduce with redis 4.0.1 & 6.0.3 and php redis 5.3.1 (i'm running redis directly on my macbook - just installed it with homebrew)

Just replicated this again today in production.

me too my redis version is 6.0.9 , but that doesn't matter here

The problem is when a user logs in we fork the session, that calls session_regenerate_id which in turn is calling close() method in the redishandler.. then there is one call not prefixes with the SELECT 3 before the final one that is

1620577852.929944 [0 127.0.0.1:45328] "SELECT" "3"
1620577852.930576 [3 127.0.0.1:45328] "GET" "jfwq82eg5u74dbd04fgh403583uf9"
1620577853.013048 [3 127.0.0.1:45328] "SETEX" "jfwq82eg5u74dbd04fgh403583uf9" "900" "joomla|s:772:\"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\";"
# session_regenerate_id happens here
1620577853.013575 [0 127.0.0.1:45332] "GET" "jfw7hcnuunemq7cq4ook4s4fu29km"
1620577853.029165 [0 127.0.0.1:45332] "SETEX" "jfw7hcnuunemq7cq4ook4s4fu29km" "900" "joomla|s:776:\"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\";"

1620577853.037070 [0 127.0.0.1:45336] "SELECT" "3"
1620577853.037602 [3 127.0.0.1:45336] "GET" "jfw7hcnuunemq7cq4ook4s4fu29km"
1620577853.115258 [3 127.0.0.1:45336] "SETEX" "jfw7hcnuunemq7cq4ook4s4fu29km" "900" "joomla|s:772:\"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\";"

Fix PRed upstream here joomla-framework/session#50

ok this PR upstream now works for login and logout joomla-framework/session#51

[4] Reminder to update joomla-framework/session #33778

The installation of Joomla 4 is broken when using redis as a session manager for PHP.

PHP Warning: SessionHandler::read(): open(tcp://redis:6379/sess_nhqdh7rukrs8e9u44fi56hmmh6, O_RDWR) failed: No such file or directory (2) in /mnt/disks/nb-sites/www/xxx.xxx/libraries/vendor/joomla/session/src/Storage/NativeStorage.php

Works fine for Joomla 3

What EXACT configuration are you using in Joomla global Config? Also, are you configuring this in Joomla Global Config or php.ini?

Steps to reproduce:

• Configure Redis as a session store for PHP in php.ini
• Download clean joomla installation from joomla.org
• Don´t alter anything in regards to Joomla. Configurations are default.
• Navigate to the Joomla installation page

Instead of the installation view, you will be greated with this:

ok so you are configuring in php.ini and not in Joomla - got it.

Now enable debug mode in Joomla Global Config to convert your Red Page of Death to a stack trace and post that here.

If Im honest, the message leads me to believe your redis server is not running...

It is running, as it is working fine for installation of Joomla 3 which I did five minutes ago. This is from our production environment were we are running about 70 different Joomla sites. Here is the stack trace:

RuntimeException:
Failed to start the session

at /mnt/disks/nb-sites/www/xxx.xxx/libraries/vendor/joomla/session/src/Storage/NativeStorage.php:480
at Joomla\Session\Storage\NativeStorage->start()
(/mnt/disks/nb-sites/www/xxx.xxx/libraries/src/Session/Storage/JoomlaStorage.php:305)
at Joomla\CMS\Session\Storage\JoomlaStorage->start()
(/mnt/disks/nb-sites/www/xxx.xxx/libraries/vendor/joomla/session/src/Session.php:405)
at Joomla\Session\Session->start()
(/mnt/disks/nb-sites/www/xxx.xxx/libraries/vendor/joomla/session/src/Session.php:332)
at Joomla\Session\Session->has()
(/mnt/disks/nb-sites/www/xxx.xxx/libraries/src/Session/Session.php:201)
at Joomla\CMS\Session\Session->get()
(/mnt/disks/nb-sites/www/xxx.xxx/libraries/src/Application/CMSApplication.php:532)
at Joomla\CMS\Application\CMSApplication->getMessageQueue()
(/mnt/disks/nb-sites/www/xxx.xxx/libraries/src/Document/Renderer/Html/MessageRenderer.php:77)
at Joomla\CMS\Document\Renderer\Html\MessageRenderer->getData()
(/mnt/disks/nb-sites/www/xxx.xxx/libraries/src/Document/Renderer/Html/MessageRenderer.php:38)
at Joomla\CMS\Document\Renderer\Html\MessageRenderer->render()
(/mnt/disks/nb-sites/www/xxx.xxx/libraries/src/Document/HtmlDocument.php:589)
at Joomla\CMS\Document\HtmlDocument->getBuffer()
(/mnt/disks/nb-sites/www/xxx.xxx/libraries/src/Document/HtmlDocument.php:895)
at Joomla\CMS\Document\HtmlDocument->_renderTemplate()
(/mnt/disks/nb-sites/www/xxx.xxx/libraries/src/Document/HtmlDocument.php:660)
at Joomla\CMS\Document\HtmlDocument->render()
(/mnt/disks/nb-sites/www/xxx.xxx/libraries/src/Document/ErrorDocument.php:140)
at Joomla\CMS\Document\ErrorDocument->render()
(/mnt/disks/nb-sites/www/xxx.xxx/libraries/src/Error/Renderer/HtmlRenderer.php:77)
at Joomla\CMS\Error\Renderer\HtmlRenderer->render()
(/mnt/disks/nb-sites/www/xxx.xxx/libraries/src/Exception/ExceptionHandler.php:128)
at Joomla\CMS\Exception\ExceptionHandler::render()
(/mnt/disks/nb-sites/www/xxx.xxx/installation/src/Application/InstallationApplication.php:268)
at Joomla\CMS\Installation\Application\InstallationApplication->execute()
(/mnt/disks/nb-sites/www/xxx.xxx/installation/includes/app.php:65)
at require_once('/mnt/disks/nb-sites/www/xxx.xxx/installation/includes/app.php')
(/mnt/disks/nb-sites/www/xxx.xxx/installation/index.php:36)

forked to #35471 as this issue is closed and is a different issue with a different root cause

Just because it worked in Joomla 3 doesnt mean it will in Joomla 4 - considerable changes have been made in Joomla 4.