Disable IPv6 for urbackup_server in an IPv4-only jail

I started playing around with UrBackup looking for a solution to backup my Windows clients to my FreeBSD server.
archivers/urbackup-server process tries to bind to IPv6 addresses on an IPv4-only interface and is unable to start due to that.

After starting the server daemon nothing happened, just /var/log/urbackup.log shows:
Code:
ERROR: HTTP: Creating v6 SOCKET failed
Running in a FreeBSD 13.2-RELEASE jail (ip-aliased) with only IPv4 adresses. Trying the same in an IPv4 vnet jail leads to no error messages at all - but does not work either.

How can I disable IPv6 for the urbackup_server process? I searched the UrBackup forum and cli help but couldn't find any hints for corresponding command line arguments or configuration file entries there. Thanks for your support.
 
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