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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 26.0.0
Operating system and version (eg, Ubuntu 20.04): replace me
Apache or nginx version (eg, Apache 2.4.25): 1.23.3
PHP version (eg, 7.4): 8.0
The issue you are facing:
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Update from 25.0.4
The output of your Nextcloud log in Admin > Logging:
{"reqId":"bwBqcbMPqw3MhGvpKZ2r","level":3,"time":"2023-03-24T09:46:50+00:00","remoteAddr":"192.168.144.37","user":"root","app":"no app in context","method":"POST","url":"/ocs/v2.php/cloud/users/XXX%40XXX/welcome","message":"Symfony\\Component\\Mailer\\Transport\\Smtp\\Stream\\SocketStream::setTimeout(): Argument #1 ($timeout) must be of type float, string given, called in /var/www/nextcloud/lib/private/Mail/Mailer.php on line 305 in file '/var/www/nextcloud/3rdparty/symfony/mailer/Transport/Smtp/Stream/SocketStream.php' line 37","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36","version":"26.0.0.11","exception":{"Exception":"Exception","Message":"Symfony\\Component\\Mailer\\Transport\\Smtp\\Stream\\SocketStream::setTimeout(): Argument #1 ($timeout) must be of type float, string given, called in /var/www/nextcloud/lib/private/Mail/Mailer.php on line 305 in file '/var/www/nextcloud/3rdparty/symfony/mailer/Transport/Smtp/Stream/SocketStream.php' line 37","Code":0,"Trace":[{"file":"/var/www/nextcloud/lib/private/AppFramework/App.php","line":183,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/nextcloud/lib/private/Route/Router.php","line":315,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/nextcloud/ocs/v1.php","line":63,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/nextcloud/ocs/v2.php","line":23,"args":["/var/www/nextcloud/ocs/v1.php"],"function":"require_once"}],"File":"/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","Line":169,"Previous":{"Exception":"TypeError","Message":"Symfony\\Component\\Mailer\\Transport\\Smtp\\Stream\\SocketStream::setTimeout(): Argument #1 ($timeout) must be of type float, string given, called in /var/www/nextcloud/lib/private/Mail/Mailer.php on line 305","Code":0,"Trace":[{"file":"/var/www/nextcloud/lib/private/Mail/Mailer.php","line":305,"function":"setTimeout","class":"Symfony\\Component\\Mailer\\Transport\\Smtp\\Stream\\SocketStream","type":"->"},{"file":"/var/www/nextcloud/lib/private/Mail/Mailer.php","line":276,"function":"getSmtpInstance","class":"OC\\Mail\\Mailer","type":"->"},{"file":"/var/www/nextcloud/lib/private/Mail/Mailer.php","line":189,"function":"getInstance","class":"OC\\Mail\\Mailer","type":"->"},{"file":"/var/www/nextcloud/apps/settings/lib/Mailer/NewUserMailHelper.php","line":186,"function":"send","class":"OC\\Mail\\Mailer","type":"->"},{"file":"/var/www/nextcloud/apps/provisioning_api/lib/Controller/UsersController.php","line":1411,"function":"sendMail","class":"OCA\\Settings\\Mailer\\NewUserMailHelper","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":230,"function":"resendWelcomeMessage","class":"OCA\\Provisioning_API\\Controller\\UsersController","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":137,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/App.php","line":183,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/nextcloud/lib/private/Route/Router.php","line":315,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/nextcloud/ocs/v1.php","line":63,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/nextcloud/ocs/v2.php","line":23,"args":["/var/www/nextcloud/ocs/v1.php"],"function":"require_once"}],"File":"/var/www/nextcloud/3rdparty/symfony/mailer/Transport/Smtp/Stream/SocketStream.php","Line":37},"CustomMessage":"--"}}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
'app.mail.imap.timeout' => 20,
'app.mail.smtp.timeout' => 2,
'mail_from_address' => 'share',
'mail_smtpmode' => 'smtp',
'mail_smtpauthtype' => 'LOGIN',
'mail_domain' => 'domain.de',
'mail_smtptimeout' => '30',
'app.mail.transport' => 'php-mail',
'mail_smtphost' => 'XXX.XXX.XXX.XXX',
'mail_smtpport' => '2525',
The output of your Apache/nginx/system log in /var/log/nginx/access.log:
[24/Mar/2023:10:46:50 +0100] "POST /ocs/v2.php/cloud/users/user%40domain.de/welcome HTTP/2.0" 500 163 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36"
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.
PASTE HERE
