Missing error handling for inaccessible remote instances

Steps to reproduce

1. ???
2. Look at Sentry

Expected behaviour

Happy Sentry

Actual behaviour

Sad Sentry

https://nextcloud-gmbh.sentry.io/issues/4214844583/?project=1500477

Server configuration

Operating system:

Web server:

Database:

PHP version:

Nextcloud version: (see Nextcloud admin page)

Where did you install Nextcloud from:

Signing status:

Login as admin user into your Nextcloud and access
http://example.com/index.php/settings/integrity/failed
paste the results here.

List of activated apps:

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your Nextcloud installation folder

Nextcloud configuration:

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your Nextcloud installation folder

or

Insert your config.php content here
Make sure to remove all sensitive content such as passwords. (e.g. database password, passwordsalt, secret, smtp password, …)

Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/...

Client configuration

Browser:

Operating system:

Logs

Nextcloud log (data/nextcloud.log)

GuzzleHttp\Exception\RequestException: cURL error 60: SSL certificate problem: certificate has expired (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://nextcloud.otherserver.tld/ocs/v2.php/apps/activity/api/v2/remote/abcdefg12345
#20 /var/www/cloud.example.tld/nextcloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php(211): GuzzleHttp\Handler\CurlFactory::createRejection
#19 /var/www/cloud.example.tld/nextcloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php(158): GuzzleHttp\Handler\CurlFactory::finishError
#18 /var/www/cloud.example.tld/nextcloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php(110): GuzzleHttp\Handler\CurlFactory::finish
#17 /var/www/cloud.example.tld/nextcloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlHandler.php(47): GuzzleHttp\Handler\CurlHandler::__invoke
#16 /var/www/cloud.example.tld/nextcloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php(137): GuzzleHttp\Middleware::GuzzleHttp\{closure}
#15 /var/www/cloud.example.tld/nextcloud/lib/private/Http/Client/DnsPinMiddleware.php(154): OC\Http\Client\DnsPinMiddleware::OC\Http\Client\{closure}
#14 /var/www/cloud.example.tld/nextcloud/3rdparty/guzzlehttp/guzzle/src/PrepareBodyMiddleware.php(64): GuzzleHttp\PrepareBodyMiddleware::__invoke
#13 /var/www/cloud.example.tld/nextcloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php(31): GuzzleHttp\Middleware::GuzzleHttp\{closure}
#12 /var/www/cloud.example.tld/nextcloud/3rdparty/guzzlehttp/guzzle/src/RedirectMiddleware.php(71): GuzzleHttp\RedirectMiddleware::__invoke
#11 /var/www/cloud.example.tld/nextcloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php(63): GuzzleHttp\Middleware::GuzzleHttp\{closure}
#10 /var/www/cloud.example.tld/nextcloud/3rdparty/guzzlehttp/guzzle/src/HandlerStack.php(75): GuzzleHttp\HandlerStack::__invoke
#9 /var/www/cloud.example.tld/nextcloud/3rdparty/guzzlehttp/guzzle/src/Client.php(331): GuzzleHttp\Client::transfer
#8 /var/www/cloud.example.tld/nextcloud/3rdparty/guzzlehttp/guzzle/src/Client.php(168): GuzzleHttp\Client::requestAsync
#7 /var/www/cloud.example.tld/nextcloud/3rdparty/guzzlehttp/guzzle/src/Client.php(187): GuzzleHttp\Client::request
#6 /var/www/cloud.example.tld/nextcloud/lib/private/Http/Client/Client.php(301): OC\Http\Client\Client::post
#5 /activity/lib/BackgroundJob/RemoteActivity.php(88): OCA\Activity\BackgroundJob\RemoteActivity::sendActivity
#4 [internal](0): call_user_func_array
#3 /activity/lib/BackgroundJob/RemoteActivity.php(44): OCA\Activity\BackgroundJob\RemoteActivity::run
#2 /var/www/cloud.example.tld/nextcloud/lib/private/BackgroundJob/Job.php(54): OC\BackgroundJob\Job::execute
#1 /var/www/cloud.example.tld/nextcloud/lib/private/BackgroundJob/QueuedJob.php(47): OC\BackgroundJob\QueuedJob::execute
#0 /var/www/cloud.example.tld/nextcloud/cron.php(152): null

Browser log

Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log
c) ...

Start in activity/lib/BackgroundJob/RemoteActivity.php, especially run at line 44 and sendActivity at line 88, using the Sentry report and stack trace as context. Trace how inaccessible remote instances and the reported expired SSL certificate are handled; done means the background job no longer produces an unhandled error for this case.