# composer diag
Checking platform settings: OK
Checking git settings: OK git version 2.25.1
Checking http connectivity to packagist: OK
Checking https connectivity to packagist: OK
Checking HTTP proxy with http: OK http://webproxy.is.elb.de:9090
Checking HTTP proxy with https: OK http://webproxy.is.elb.de:9090
Checking github.com oauth access: OK does not expire
Checking disk free space: OK
The installation does not work behind a corporate proxy. Here is the error message:
Composer and environment variables are configured correctly, my Ubuntu works fine:
Does anyone have any idea what I can do?