[Bug]: App Installs / Updates with IPv6 and Debian Trixie: RequestException cURL error 60: SSL: no alternative certificate subject name matches target hostname 'github.com'

[silence87]

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

On a Dual-Stack-Configuration with IPv4 and IPv6, downloading for install or update apps from appstore is sometimes not possible as ipv6 is usually preferred.
Github.com is ipv4 only.

Althought this kind of issue was handled in #56489, this bug is present already.

Steps to reproduce

1. Install Debian 13, make sure you have a DS-config with 1 public ipv4 and 1 public ipv6 address.
2. install or upgrade an app from appstore, where its release is hosted on github.com (e.g guests, notify_push)
3. Web or CLI doesn't make a difference

Expected behavior

Download and install or update app successfully.

Nextcloud Server version

33

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.4

Web server

Nginx

Database engine version

Other

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

sudo -u www-data php occ config:list system
{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "***REMOVED SENSITIVE VALUE***"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "33.0.3.2",
        "overwrite.cli.url": "***REMOVED SENSITIVE VALUE***",
        "htaccess.RewriteBase": "\/",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "default_phone_region": "AT",
        "memcache.distributed": "\\OC\\Memcache\\APCu",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "memcache.local": "\\OC\\Memcache\\APCu",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 0,
            "timeout": 0
        },
        "mail_smtpmode": "smtp",
        "mail_sendmailmode": "smtp",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpauth": true,
        "mail_smtpport": "587",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "maintenance": false,
        "theme": "",
        "loglevel": 0,
        "app_install_overwrite": [
            "files_downloadactivity"
        ],
        "maintenance_window_start": 22,
        "allow_local_remote_servers ": true,
        "serverid": 1,
        "dns_pinning": false
    }
}

List of activated Apps

Enabled:
  - activity: 6.0.0
  - admin_audit: 1.23.0
  - app_api: 33.0.0
  - bruteforcesettings: 6.0.0
  - camerarawpreviews: 0.9.0
  - circles: 33.0.0
  - cloud_federation_api: 1.17.0
  - comments: 1.23.0
  - contactsinteraction: 1.14.1
  - dav: 1.36.0
  - encryption: 2.21.0
  - federatedfilesharing: 1.23.0
  - federation: 1.23.0
  - files: 2.5.0
  - files_antivirus: 6.2.0
  - files_downloadactivity: 1.18.1
  - files_downloadlimit: 5.1.0
  - files_external: 1.25.1
  - files_pdfviewer: 6.0.0
  - files_reminders: 1.6.0
  - files_sharing: 1.25.2
  - files_trashbin: 1.23.0
  - files_versions: 1.26.0
  - firstrunwizard: 6.0.0
  - group_default_quota: 0.1.14
  - groupfolders: 21.0.7
  - guests: 4.7.4
  - imageconverter: 2.2.0
  - logreader: 6.0.0
  - lookup_server_connector: 1.21.0
  - nextcloud_announcements: 5.0.0
  - notifications: 6.0.0
  - notify_push: 1.3.3
  - oauth2: 1.21.0
  - password_policy: 5.0.0
  - photos: 6.0.0
  - privacy: 5.0.0
  - profile: 1.2.0
  - provisioning_api: 1.23.0
  - quota_warning: 1.23.0
  - recommendations: 6.0.0
  - related_resources: 4.0.0
  - serverinfo: 5.0.0
  - settings: 1.16.0
  - sharebymail: 1.23.0
  - support: 5.0.0
  - survey_client: 5.0.0
  - systemtags: 1.23.0
  - text: 7.0.1
  - theming: 2.8.0
  - twofactor_backupcodes: 1.22.0
  - twofactor_totp: 15.0.0
  - updatenotification: 1.23.0
  - user_status: 1.13.0
  - user_usage_report: 4.0.0
  - viewer: 6.0.0
  - webhook_listeners: 1.5.0
  - workflowengine: 2.15.0
Disabled:
  - dashboard: 7.13.0 (installed 7.6.0)
  - files_rightclick: 0.15.1 (installed 1.6.0)
  - suspicious_login: 11.0.0
  - testing: 1.23.0
  - twofactor_nextcloud_notification: 7.0.0
  - user_ldap: 1.24.0
  - weather_status: 1.13.0 (installed 1.6.0)

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

{"reqId":"t2EQ44NQVBzBu3tMkSXX","level":3,"time":"2026-05-21T09:47:25+00:00","remoteAddr":"81.*.*.*","user":"<snip>","app":"no app in context","method":"GET","url":"/settings/apps/update/notify_push","scriptName":"/index.php","message":"cURL error 60: SSL: no alternative certificate subject name matches target hostname 'github.com' (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://github.com/nextcloud-releases/notify_push/releases/download/v1.3.3/notify_push-v1.3.3.tar.gz","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.0.0 Safari/537.36","version":"33.0.3.2","exception":{"Exception":"GuzzleHttp\\Exception\\RequestException","Message":"cURL error 60: SSL: no alternative certificate subject name matches target hostname 'github.com' (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://github.com/nextcloud-releases/notify_push/releases/download/v1.3.3/notify_push-v1.3.3.tar.gz","Code":0,"Trace":[{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php","line":207,"function":"createRejection","class":"GuzzleHttp\\Handler\\CurlFactory","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php","line":159,"function":"finishError","class":"GuzzleHttp\\Handler\\CurlFactory","type":"::"},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlHandler.php","line":47,"function":"finish","class":"GuzzleHttp\\Handler\\CurlFactory","type":"::"},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php","line":142,"function":"__invoke","class":"GuzzleHttp\\Handler\\CurlHandler","type":"->"},{"file":"/var/www/html/cloud/lib/private/Http/Client/DnsPinMiddleware.php","line":150,"function":"{closure:{closure:GuzzleHttp\\Middleware::tap():137}:138}","class":"GuzzleHttp\\Middleware","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/PrepareBodyMiddleware.php","line":35,"function":"{closure:{closure:OC\\Http\\Client\\DnsPinMiddleware::addDnsPinning():104}:105}","class":"OC\\Http\\Client\\DnsPinMiddleware","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php","line":31,"function":"__invoke","class":"GuzzleHttp\\PrepareBodyMiddleware","type":"->"},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/RedirectMiddleware.php","line":71,"function":"{closure:{closure:GuzzleHttp\\Middleware::cookies():28}:29}","class":"GuzzleHttp\\Middleware","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php","line":66,"function":"__invoke","class":"GuzzleHttp\\RedirectMiddleware","type":"->"},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/HandlerStack.php","line":75,"function":"{closure:{closure:GuzzleHttp\\Middleware::httpErrors():60}:61}","class":"GuzzleHttp\\Middleware","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Client.php","line":333,"function":"__invoke","class":"GuzzleHttp\\HandlerStack","type":"->"},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Client.php","line":169,"function":"transfer","class":"GuzzleHttp\\Client","type":"->"},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Client.php","line":189,"function":"requestAsync","class":"GuzzleHttp\\Client","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/cloud/lib/private/Http/Client/Client.php","line":219,"function":"request","class":"GuzzleHttp\\Client","type":"->"},{"file":"/var/www/html/cloud/lib/private/Installer.php","line":238,"function":"get","class":"OC\\Http\\Client\\Client","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/cloud/lib/private/Installer.php","line":104,"function":"downloadApp","class":"OC\\Installer","type":"->"},{"file":"/var/www/html/cloud/apps/settings/lib/Controller/AppSettingsController.php","line":663,"function":"updateAppstoreApp","class":"OC\\Installer","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/cloud/lib/private/AppFramework/Http/Dispatcher.php","line":205,"function":"updateApp","class":"OCA\\Settings\\Controller\\AppSettingsController","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/cloud/lib/private/AppFramework/Http/Dispatcher.php","line":118,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/html/cloud/lib/private/AppFramework/App.php","line":153,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/html/cloud/lib/private/Route/Router.php","line":321,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/html/cloud/lib/base.php","line":1155,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/html/cloud/index.php","line":25,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php","Line":278,"message":"cURL error 60: SSL: no alternative certificate subject name matches target hostname 'github.com' (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://github.com/nextcloud-releases/notify_push/releases/download/v1.3.3/notify_push-v1.3.3.tar.gz","exception":"{\"class\":\"GuzzleHttp\\Exception\\RequestException\",\"message\":\"cURL error 60: SSL: no alternative certificate subject name matches target hostname 'github.com' (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://github.com/nextcloud-releases/notify_push/releases/download/v1.3.3/notify_push-v1.3.3.tar.gz\",\"code\":0,\"file\":\"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php:278\",\"trace\":\"#0 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php(207): GuzzleHttp\\Handler\\CurlFactory::createRejection()\\n#1 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php(159): GuzzleHttp\\Handler\\CurlFactory::finishError()\\n#2 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlHandler.php(47): GuzzleHttp\\Handler\\CurlFactory::finish()\\n#3 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php(142): GuzzleHttp\\Handler\\CurlHandler->__invoke()\\n#4 /var/www/html/cloud/lib/private/Http/Client/DnsPinMiddleware.php(150): GuzzleHttp\\Middleware::{closure:{closure:GuzzleHttp\\Middleware::tap():137}:138}()\\n#5 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/PrepareBodyMiddleware.php(35): OC\\Http\\Client\\DnsPinMiddleware->{closure:{closure:OC\\Http\\Client\\DnsPinMiddleware::addDnsPinning():104}:105}()\\n#6 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php(31): GuzzleHttp\\PrepareBodyMiddleware->__invoke()\\n#7 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/RedirectMiddleware.php(71): GuzzleHttp\\Middleware::{closure:{closure:GuzzleHttp\\Middleware::cookies():28}:29}()\\n#8 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php(66): GuzzleHttp\\RedirectMiddleware->__invoke()\\n#9 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/HandlerStack.php(75): GuzzleHttp\\Middleware::{closure:{closure:GuzzleHttp\\Middleware::httpErrors():60}:61}()\\n#10 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Client.php(333): GuzzleHttp\\HandlerStack->__invoke()\\n#11 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Client.php(169): GuzzleHttp\\Client->transfer()\\n#12 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Client.php(189): GuzzleHttp\\Client->requestAsync()\\n#13 /var/www/html/cloud/lib/private/Http/Client/Client.php(219): GuzzleHttp\\Client->request()\\n#14 /var/www/html/cloud/lib/private/Installer.php(238): OC\\Http\\Client\\Client->get()\\n#15 /var/www/html/cloud/lib/private/Installer.php(104): OC\\Installer->downloadApp()\\n#16 /var/www/html/cloud/apps/settings/lib/Controller/AppSettingsController.php(663): OC\\Installer->updateAppstoreApp()\\n#17 /var/www/html/cloud/lib/private/AppFramework/Http/Dispatcher.php(205): OCA\\Settings\\Controller\\AppSettingsController->updateApp()\\n#18 /var/www/html/cloud/lib/private/AppFramework/Http/Dispatcher.php(118): OC\\AppFramework\\Http\\Dispatcher->executeController()\\n#19 /var/www/html/cloud/lib/private/AppFramework/App.php(153): OC\\AppFramework\\Http\\Dispatcher->dispatch()\\n#20 /var/www/html/cloud/lib/private/Route/Router.php(321): OC\\AppFramework\\App::main()\\n#21 /var/www/html/cloud/lib/base.php(1155): OC\\Route\\Router->match()\\n#22 /var/www/html/cloud/index.php(25): OC::handleRequest()\\n#23 {main}\"}","CustomMessage":"cURL error 60: SSL: no alternative certificate subject name matches target hostname 'github.com' (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://github.com/nextcloud-releases/notify_push/releases/download/v1.3.3/notify_push-v1.3.3.tar.gz"}}
{"reqId":"8sI9CCuYBhdD4mOhK3wk","level":3,"time":"2026-05-21T09:47:25+00:00","remoteAddr":"81.*.*.*","user":"<snip>","app":"no app in context","method":"GET","url":"/settings/apps/update/guests","scriptName":"/index.php","message":"cURL error 60: SSL: no alternative certificate subject name matches target hostname 'github.com' (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://github.com/nextcloud-releases/guests/releases/download/v4.7.3/guests-v4.7.3.tar.gz","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.0.0 Safari/537.36","version":"33.0.3.2","exception":{"Exception":"GuzzleHttp\\Exception\\RequestException","Message":"cURL error 60: SSL: no alternative certificate subject name matches target hostname 'github.com' (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://github.com/nextcloud-releases/guests/releases/download/v4.7.3/guests-v4.7.3.tar.gz","Code":0,"Trace":[{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php","line":207,"function":"createRejection","class":"GuzzleHttp\\Handler\\CurlFactory","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php","line":159,"function":"finishError","class":"GuzzleHttp\\Handler\\CurlFactory","type":"::"},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlHandler.php","line":47,"function":"finish","class":"GuzzleHttp\\Handler\\CurlFactory","type":"::"},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php","line":142,"function":"__invoke","class":"GuzzleHttp\\Handler\\CurlHandler","type":"->"},{"file":"/var/www/html/cloud/lib/private/Http/Client/DnsPinMiddleware.php","line":150,"function":"{closure:{closure:GuzzleHttp\\Middleware::tap():137}:138}","class":"GuzzleHttp\\Middleware","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/PrepareBodyMiddleware.php","line":35,"function":"{closure:{closure:OC\\Http\\Client\\DnsPinMiddleware::addDnsPinning():104}:105}","class":"OC\\Http\\Client\\DnsPinMiddleware","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php","line":31,"function":"__invoke","class":"GuzzleHttp\\PrepareBodyMiddleware","type":"->"},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/RedirectMiddleware.php","line":71,"function":"{closure:{closure:GuzzleHttp\\Middleware::cookies():28}:29}","class":"GuzzleHttp\\Middleware","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php","line":66,"function":"__invoke","class":"GuzzleHttp\\RedirectMiddleware","type":"->"},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/HandlerStack.php","line":75,"function":"{closure:{closure:GuzzleHttp\\Middleware::httpErrors():60}:61}","class":"GuzzleHttp\\Middleware","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Client.php","line":333,"function":"__invoke","class":"GuzzleHttp\\HandlerStack","type":"->"},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Client.php","line":169,"function":"transfer","class":"GuzzleHttp\\Client","type":"->"},{"file":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Client.php","line":189,"function":"requestAsync","class":"GuzzleHttp\\Client","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/cloud/lib/private/Http/Client/Client.php","line":219,"function":"request","class":"GuzzleHttp\\Client","type":"->"},{"file":"/var/www/html/cloud/lib/private/Installer.php","line":238,"function":"get","class":"OC\\Http\\Client\\Client","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/cloud/lib/private/Installer.php","line":104,"function":"downloadApp","class":"OC\\Installer","type":"->"},{"file":"/var/www/html/cloud/apps/settings/lib/Controller/AppSettingsController.php","line":663,"function":"updateAppstoreApp","class":"OC\\Installer","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/cloud/lib/private/AppFramework/Http/Dispatcher.php","line":205,"function":"updateApp","class":"OCA\\Settings\\Controller\\AppSettingsController","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/cloud/lib/private/AppFramework/Http/Dispatcher.php","line":118,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/html/cloud/lib/private/AppFramework/App.php","line":153,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/html/cloud/lib/private/Route/Router.php","line":321,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/html/cloud/lib/base.php","line":1155,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/html/cloud/index.php","line":25,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php","Line":278,"message":"cURL error 60: SSL: no alternative certificate subject name matches target hostname 'github.com' (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://github.com/nextcloud-releases/guests/releases/download/v4.7.3/guests-v4.7.3.tar.gz","exception":"{\"class\":\"GuzzleHttp\\Exception\\RequestException\",\"message\":\"cURL error 60: SSL: no alternative certificate subject name matches target hostname 'github.com' (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://github.com/nextcloud-releases/guests/releases/download/v4.7.3/guests-v4.7.3.tar.gz\",\"code\":0,\"file\":\"/var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php:278\",\"trace\":\"#0 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php(207): GuzzleHttp\\Handler\\CurlFactory::createRejection()\\n#1 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php(159): GuzzleHttp\\Handler\\CurlFactory::finishError()\\n#2 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlHandler.php(47): GuzzleHttp\\Handler\\CurlFactory::finish()\\n#3 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php(142): GuzzleHttp\\Handler\\CurlHandler->__invoke()\\n#4 /var/www/html/cloud/lib/private/Http/Client/DnsPinMiddleware.php(150): GuzzleHttp\\Middleware::{closure:{closure:GuzzleHttp\\Middleware::tap():137}:138}()\\n#5 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/PrepareBodyMiddleware.php(35): OC\\Http\\Client\\DnsPinMiddleware->{closure:{closure:OC\\Http\\Client\\DnsPinMiddleware::addDnsPinning():104}:105}()\\n#6 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php(31): GuzzleHttp\\PrepareBodyMiddleware->__invoke()\\n#7 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/RedirectMiddleware.php(71): GuzzleHttp\\Middleware::{closure:{closure:GuzzleHttp\\Middleware::cookies():28}:29}()\\n#8 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php(66): GuzzleHttp\\RedirectMiddleware->__invoke()\\n#9 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/HandlerStack.php(75): GuzzleHttp\\Middleware::{closure:{closure:GuzzleHttp\\Middleware::httpErrors():60}:61}()\\n#10 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Client.php(333): GuzzleHttp\\HandlerStack->__invoke()\\n#11 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Client.php(169): GuzzleHttp\\Client->transfer()\\n#12 /var/www/html/cloud/3rdparty/guzzlehttp/guzzle/src/Client.php(189): GuzzleHttp\\Client->requestAsync()\\n#13 /var/www/html/cloud/lib/private/Http/Client/Client.php(219): GuzzleHttp\\Client->request()\\n#14 /var/www/html/cloud/lib/private/Installer.php(238): OC\\Http\\Client\\Client->get()\\n#15 /var/www/html/cloud/lib/private/Installer.php(104): OC\\Installer->downloadApp()\\n#16 /var/www/html/cloud/apps/settings/lib/Controller/AppSettingsController.php(663): OC\\Installer->updateAppstoreApp()\\n#17 /var/www/html/cloud/lib/private/AppFramework/Http/Dispatcher.php(205): OCA\\Settings\\Controller\\AppSettingsController->updateApp()\\n#18 /var/www/html/cloud/lib/private/AppFramework/Http/Dispatcher.php(118): OC\\AppFramework\\Http\\Dispatcher->executeController()\\n#19 /var/www/html/cloud/lib/private/AppFramework/App.php(153): OC\\AppFramework\\Http\\Dispatcher->dispatch()\\n#20 /var/www/html/cloud/lib/private/Route/Router.php(321): OC\\AppFramework\\App::main()\\n#21 /var/www/html/cloud/lib/base.php(1155): OC\\Route\\Router->match()\\n#22 /var/www/html/cloud/index.php(25): OC::handleRequest()\\n#23 {main}\"}","CustomMessage":"cURL error 60: SSL: no alternative certificate subject name matches target hostname 'github.com' (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://github.com/nextcloud-releases/guests/releases/download/v4.7.3/guests-v4.7.3.tar.gz"}}

Additional info

Mysql is Percona Mysql Server 8.0, but irrelevant.

Possible Workaround:

server/lib/private/Installer.php

Line 239 in cbc8033

$client->get($app['releases'][0]['download'], ['sink' => $tempFile, 'timeout' => $timeout]);

$client->get($app['releases'][0]['download'], ['sink' => $tempFile, 'timeout' => $timeout, 'force_ip_resolve' => 'v4']);