Maven release:prepare won't work

Greetings,
I’m trying to release from my account on GitLab. Here is an excerpt of the maven standard output:

[INFO] Checking in modified POMs…
[INFO] Executing: cmd.exe /X /C “git add – pom.xml ldap-data\pom.xml ldap-facade\pom.xml ldap-ear\pom.xml”
[INFO] Working directory: C:\Users\nduminil\workspace\ldap-master
[INFO] Executing: cmd.exe /X /C “git status”
[INFO] Working directory: C:\Users\nduminil\workspace\ldap-master
[INFO] Tagging release with the label ldap-master-1.0.0…
[INFO] Executing: cmd.exe /X /C “git tag -F C:\Users\nduminil\AppData\Local\Temp\maven-scm-2008978120.commit
-1.0.0”
[INFO] Working directory: C:\Users\nduminil\workspace\ldap-master
[INFO] Executing: cmd.exe /X /C “git push https://gitlab.com/maileva-java/ldap.git ldap-master-1.0.0”
[INFO] Working directory: C:\Users\nduminil\workspace\ldap-master

The git push command never finishes, neither after one hour.
Many thanks in adavance for any help.
Kind regards,
Nicolas