Hi Marco,
This forum isn’t the right place to debug technical problems.
If you have a support contract with us you can use our support system at https://support.sonatype.com. Please note that the support system is for licensed customers only.
Otherwise, if you think this is a bug, you can try raising an issue at https://issues.sonatype.org in the “Dev - Nexus” issue.
Either way, provide a support zip file if you can get to the Nexus Repo UI. Or provide the complete nexus.log file otherwise.
Regards,
Rich