Feed Update - only CERT data

it was possible to download the CERT data (Cert-Bund Advisories and DFN-Cert Advisories). But I can’t download the vulnerabilities (CVEs, and so on).

I have checked the logs:

And I know this issue is related to FW / network settings (only 1 connection per source IP and no NAT), but I have now waited more than a day and this issue is still concurring.
So if it’s possible to download the CERT data, should it be not possible to download also the other data?! All of them will be downloaded by the feed.community.grenbone.net via port 873 (RSYNC) or not?

Thanks and regards.